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• Accessing derived class members with a base class pointer

  - by LRB

  I am making a simple console game in C++ I would like to know if I can access members from the 'entPlayer' class while using a pointer that is pointing to the base class ( 'Entity' ): class Entity { public: void setId(int id) { Id = id; } int getId() { return Id; } protected: int Id; }; class entPlayer : public Entity { string Name; public: entPlayer() { Name = ""; Id = 0; } void setName(string name) { Name = name; } string getName() { return Name; } }; Entity *createEntity(string Type) { Entity *Ent = NULL; if (Type == "player") { Ent = new entPlayer; } return Ent; } void main() { Entity *ply = createEntity("player"); ply->setName("Test"); ply->setId(1); cout << ply->getName() << endl; cout << ply->getId() << endl; delete ply; } How would I be able to call ply-setName etc? OR If it's not possible that way, what would be a better way?

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• Having troubles inheriting base class

  - by Nick

  When I inherit the base class, it's telling me there is no such class This is enhanced.h: class enhanced: public changeDispenser // <--------where error is occuring { public: void changeStatus(); // Function: Lets the user know how much of each coin is in the machine enhanced(int); // Constructor // Sets the Dollar amount to what the User wants void changeLoad(int); // Function: Loads what change the user requests into the Coin Machine int dispenseChange(int); // Function: Takes the users amount of cents requests and dispenses it to the user private: int dollar; }; This is enhanced.cpp: #include "enhanced.h" #include <iostream> using namespace std; enhanced::enhanced(int dol) { dollar = dol; } void enhanced::changeStatus() { cout << dollar << " dollars, "; changeDispenser::changeStatus(); } void enhanced::changeLoad(int d) { dollar = dollar + d; //changeDispenser::changeLoad; } This is changeDispenser.h: class changeDispenser { public: void changeStatus(); // Function: Lets the user know how much of each coin is in the machine changeDispenser(int, int, int, int); // Constructor // Sets the Quarters, Dimes, Nickels, and Pennies to what the User wants void changeLoad(int, int, int, int); // Function: Loads what change the user requests into the Coin Machine int dispenseChange(int); // Function: Takes the users amount of cents requests and dispenses it to the user private: int quarter; int dime; int nickel; int penny; }; I didn't include the driver file or the changeDispenser imp file, but in the driver, these are included #include "changeDispenser.h" #include "enhanced.h"

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• Best loose way to get objects with common base class

  - by Michael Teper

  I struggled to come up with a good title for this question, so suggestions are welcome. Let's say we have an abstract base class ActionBase that looks something like this: public abstract class ActionBase { public abstract string Name { get; } public abstract string Description { get; } // rest of declaration follows } And we have a bunch of different actions defined, like a MoveFileAction, WriteToRegistryAction, etc. These actions get attached to Worker objects: public class Worker { private IList<ActionBase> _actions = new List<ActionBase>(); public IList<ActionBase> Actions { get { return _actions; } } // worker stuff ... } So far, pretty straight-forward. Now, I'd like to have a UI for setting up Workers, assigning Actions, setting properties, and so on. In this UI, I want to present a list of all available actions, along with their properties, and for that I'd want to first gather up all the names and descriptions of available actions (plus the type) into a collection of the following type of item: public class ActionDescriptor { public string Name { get; } public string Description { get; } poblic Type Type { get; } } Certainly, I can use reflection to do this, but is there a better way? Having Name and Description be instance properties of ActionBase (as opposed to statics on derived classes) smells a bit, but there isn't an abstract static in C#. Thank you!

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• compass-rails 1.03 - TypeError: can't convert nil into String

  - by Romiko

  I am running: ruby 1.9.3p392 (2013-02-22) [i386-mingw32] compass-rails 1.0.3 I used the Windows RailsInstaller to install Ruby on Rails Gemfile group :assets do gem 'sass-rails', '~> 3.2.3' gem 'coffee-rails', '~> 3.2.1' gem 'compass-rails','~> 1.0.2' # See https://github.com/sstephenson/execjs#readme for more supported runtimes # gem 'therubyracer', :platforms => :ruby gem 'uglifier', '>= 1.0.3' end I am currently experiencing issues importing sprites. My sprites are in: assets/images/source in my _shared.scss file I have: //Sprites @import "./source/*.png"; $source-sprite-dimensions: true; In my application.scss I have: /* * This is a manifest file that'll be compiled into application.css, which will include all the files * listed below. * * Any CSS and SCSS file within this directory, lib/assets/stylesheets, vendor/assets/stylesheets, * or vendor/assets/stylesheets of plugins, if any, can be referenced here using a relative path. * * You're free to add application-wide styles to this file and they'll appear at the top of the * compiled file, but it's generally better to create a new file per style scope. * *= require_self */ @import "_shared.scss"; @import "baseline.scss"; @import "global.scss"; @import "normalize.scss"; @import "print.scss"; @import "desktop.scss"; @import "tablet.scss"; @import "home.css.scss"; I am also using rails server and not compass watcher. However when I browse to the page at localhost:3000/assets/application.css, I get the following error: body:before { font-weight: bold; content: "\000a TypeError: can't convert nil into String\000a (in c:\002f RangerRomOnRails\002f RangerRom\002f app\002f assets\002f stylesheets\002f desktop.scss)"; } body:after { content: "\000a C:\002f RailsInstaller\002f Ruby1.9.3\002f lib\002f ruby\002f gems\002f 1.9.1\002f gems\002f compass-0.12.2\002f lib\002f compass\002f sass_extensions\002f functions\002f image_size.rb:17:in `extname'"; } Here is the full stack trace: compass (0 .12.2) lib/compass/sass_extensions/functions/image_size.rb:17:in `extname' compass (0.12.2) lib/compass/sass_extensions/functions/image_size.rb:17:in `initialize' compass (0.12.2) lib/compass/sass_extensions/functions/image_size.rb:50:in `new' compass (0.12.2) lib/compass/sass_extensions/functions/image_size.rb:50:in `image_dimensions' compass (0.12.2) lib/compass/sass_extensions/functions/image_size.rb:4:in `image_width' sass (3.2.9) lib/sass/script/funcall.rb:112:in `_perform' sass (3.2.9) lib/sass/script/node.rb:40:in `perform' sass (3.2.9) lib/sass/tree/visitors/perform.rb:298:in `visit_prop' sass (3.2.9) lib/sass/tree/visitors/base.rb:37:in `visit' sass (3.2.9) lib/sass/tree/visitors/perform.rb:100:in `visit' sass (3.2.9) lib/sass/tree/visitors/base.rb:53:in `block in visit_children' sass (3.2.9) lib/sass/tree/visitors/base.rb:53:in `map' sass (3.2.9) lib/sass/tree/visitors/base.rb:53:in `visit_children' sass (3.2.9) lib/sass/tree/visitors/perform.rb:109:in `block in visit_children' sass (3.2.9) lib/sass/tree/visitors/perform.rb:121:in `with_environment' sass (3.2.9) lib/sass/tree/visitors/perform.rb:108:in `visit_children' sass (3.2.9) lib/sass/tree/visitors/base.rb:37:in `block in visit' sass (3.2.9) lib/sass/tree/visitors/perform.rb:320:in `visit_rule' sass (3.2.9) lib/sass/tree/visitors/base.rb:37:in `visit' sass (3.2.9) lib/sass/tree/visitors/perform.rb:100:in `visit' sass (3.2.9) lib/sass/tree/visitors/base.rb:53:in `block in visit_children' sass (3.2.9) lib/sass/tree/visitors/base.rb:53:in `map' sass (3.2.9) lib/sass/tree/visitors/base.rb:53:in `visit_children' sass (3.2.9) lib/sass/tree/visitors/perform.rb:109:in `block in visit_children' sass (3.2.9) lib/sass/tree/visitors/perform.rb:121:in `with_environment' sass (3.2.9) lib/sass/tree/visitors/perform.rb:108:in `visit_children' sass (3.2.9) lib/sass/tree/visitors/base.rb:37:in `block in visit' sass (3.2.9) lib/sass/tree/visitors/perform.rb:320:in `visit_rule' sass (3.2.9) lib/sass/tree/visitors/base.rb:37:in `visit' sass (3.2.9) lib/sass/tree/visitors/perform.rb:100:in `visit' sass (3.2.9) lib/sass/tree/visitors/base.rb:53:in `block in visit_children' sass (3.2.9) lib/sass/tree/visitors/base.rb:53:in `map' sass (3.2.9) lib/sass/tree/visitors/base.rb:53:in `visit_children' sass (3.2.9) lib/sass/tree/visitors/perform.rb:109:in `block in visit_children' sass (3.2.9) lib/sass/tree/visitors/perform.rb:121:in `with_environment' sass (3.2.9) lib/sass/tree/visitors/perform.rb:108:in `visit_children' sass (3.2.9) lib/sass/tree/visitors/base.rb:37:in `block in visit' sass (3.2.9) lib/sass/tree/visitors/perform.rb:362:in `visit_media' sass (3.2.9) lib/sass/tree/visitors/base.rb:37:in `visit' sass (3.2.9) lib/sass/tree/visitors/perform.rb:100:in `visit' sass (3.2.9) lib/sass/tree/visitors/base.rb:53:in `block in visit_children' sass (3.2.9) lib/sass/tree/visitors/base.rb:53:in `map' sass (3.2.9) lib/sass/tree/visitors/base.rb:53:in `visit_children' sass (3.2.9) lib/sass/tree/visitors/perform.rb:109:in `block in visit_children' sass (3.2.9) lib/sass/tree/visitors/perform.rb:121:in `with_environment' sass (3.2.9) lib/sass/tree/visitors/perform.rb:108:in `visit_children' sass (3.2.9) lib/sass/tree/visitors/base.rb:37:in `block in visit' sass (3.2.9) lib/sass/tree/visitors/perform.rb:128:in `visit_root' sass (3.2.9) lib/sass/tree/visitors/base.rb:37:in `visit' sass (3.2.9) lib/sass/tree/visitors/perform.rb:100:in `visit' sass (3.2.9) lib/sass/tree/visitors/perform.rb:7:in `visit' sass (3.2.9) lib/sass/tree/root_node.rb:20:in `render' sass (3.2.9) lib/sass/engine.rb:315:in `_render' sass (3.2.9) lib/sass/engine.rb:262:in `render' sass-rails (3.2.6) lib/sass/rails/template_handlers.rb:106:in `evaluate' tilt (1.4.1) lib/tilt/template.rb:103:in `render' sprockets (2.2.2) lib/sprockets/context.rb:193:in `block in evaluate' sprockets (2.2.2) lib/sprockets/context.rb:190:in `each' sprockets (2.2.2) lib/sprockets/context.rb:190:in `evaluate' sprockets (2.2.2) lib/sprockets/processed_asset.rb:12:in `initialize' sprockets (2.2.2) lib/sprockets/base.rb:249:in `new' sprockets (2.2.2) lib/sprockets/base.rb:249:in `block in build_asset' sprockets (2.2.2) lib/sprockets/base.rb:270:in `circular_call_protection' sprockets (2.2.2) lib/sprockets/base.rb:248:in `build_asset' sprockets (2.2.2) lib/sprockets/index.rb:93:in `block in build_asset' sprockets (2.2.2) lib/sprockets/caching.rb:19:in `cache_asset' sprockets (2.2.2) lib/sprockets/index.rb:92:in `build_asset' sprockets (2.2.2) lib/sprockets/base.rb:169:in `find_asset' sprockets (2.2.2) lib/sprockets/index.rb:60:in `find_asset' sprockets (2.2.2) lib/sprockets/processed_asset.rb:111:in `block in resolve_dependencies' sprockets (2.2.2) lib/sprockets/processed_asset.rb:105:in `each' sprockets (2.2.2) lib/sprockets/processed_asset.rb:105:in `resolve_dependencies' sprockets (2.2.2) lib/sprockets/processed_asset.rb:97:in `build_required_assets' sprockets (2.2.2) lib/sprockets/processed_asset.rb:16:in `initialize' sprockets (2.2.2) lib/sprockets/base.rb:249:in `new' sprockets (2.2.2) lib/sprockets/base.rb:249:in `block in build_asset' sprockets (2.2.2) lib/sprockets/base.rb:270:in `circular_call_protection' sprockets (2.2.2) lib/sprockets/base.rb:248:in `build_asset' sprockets (2.2.2) lib/sprockets/index.rb:93:in `block in build_asset' sprockets (2.2.2) lib/sprockets/caching.rb:19:in `cache_asset' sprockets (2.2.2) lib/sprockets/index.rb:92:in `build_asset' sprockets (2.2.2) lib/sprockets/base.rb:169:in `find_asset' sprockets (2.2.2) lib/sprockets/index.rb:60:in `find_asset' sprockets (2.2.2) lib/sprockets/bundled_asset.rb:38:in `init_with' sprockets (2.2.2) lib/sprockets/asset.rb:24:in `from_hash' sprockets (2.2.2) lib/sprockets/caching.rb:15:in `cache_asset' sprockets (2.2.2) lib/sprockets/index.rb:92:in `build_asset' sprockets (2.2.2) lib/sprockets/base.rb:169:in `find_asset' sprockets (2.2.2) lib/sprockets/index.rb:60:in `find_asset' sprockets (2.2.2) lib/sprockets/environment.rb:78:in `find_asset' sprockets (2.2.2) lib/sprockets/base.rb:177:in `[]' actionpack (3.2.13) lib/sprockets/helpers/rails_helper.rb:126:in `asset_for' actionpack (3.2.13) lib/sprockets/helpers/rails_helper.rb:44:in `block in stylesheet_link_tag' actionpack (3.2.13) lib/sprockets/helpers/rails_helper.rb:43:in `collect' actionpack (3.2.13) lib/sprockets/helpers/rails_helper.rb:43:in `stylesheet_link_tag' app/views/layouts/application.html.erb:16:in `_app_views_layouts_application_html_erb___824639613_33845076' actionpack (3.2.13) lib/action_view/template.rb:145:in `block in render' activesupport (3.2.13) lib/active_support/notifications.rb:125:in `instrument' actionpack (3.2.13) lib/action_view/template.rb:143:in `render' actionpack (3.2.13) lib/action_view/renderer/template_renderer.rb:59:in `render_with_layout' actionpack (3.2.13) lib/action_view/renderer/template_renderer.rb:45:in `render_template' actionpack (3.2.13) lib/action_view/renderer/template_renderer.rb:18:in `render' actionpack (3.2.13) lib/action_view/renderer/renderer.rb:36:in `render_template' actionpack (3.2.13) lib/action_view/renderer/renderer.rb:17:in `render' actionpack (3.2.13) lib/abstract_controller/rendering.rb:110:in `_render_template' actionpack (3.2.13) lib/action_controller/metal/streaming.rb:225:in `_render_template' actionpack (3.2.13) lib/abstract_controller/rendering.rb:103:in `render_to_body' actionpack (3.2.13) lib/action_controller/metal/renderers.rb:28:in `render_to_body' actionpack (3.2.13) lib/action_controller/metal/compatibility.rb:50:in `render_to_body' actionpack (3.2.13) lib/abstract_controller/rendering.rb:88:in `render' actionpack (3.2.13) lib/action_controller/metal/rendering.rb:16:in `render' actionpack (3.2.13) lib/action_controller/metal/instrumentation.rb:40:in `block (2 levels) in render' activesupport (3.2.13) lib/active_support/core_ext/benchmark.rb:5:in `block in ms' C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/benchmark.rb:295:in `realtime' activesupport (3.2.13) lib/active_support/core_ext/benchmark.rb:5:in `ms' actionpack (3.2.13) lib/action_controller/metal/instrumentation.rb:40:in `block in render' actionpack (3.2.13) lib/action_controller/metal/instrumentation.rb:83:in `cleanup_view_runtime' activerecord (3.2.13) lib/active_record/railties/controller_runtime.rb:24:in `cleanup_view_runtime' actionpack (3.2.13) lib/action_controller/metal/instrumentation.rb:39:in `render' actionpack (3.2.13) lib/action_controller/metal/implicit_render.rb:10:in `default_render' actionpack (3.2.13) lib/action_controller/metal/implicit_render.rb:5:in `send_action' actionpack (3.2.13) lib/abstract_controller/base.rb:167:in `process_action' actionpack (3.2.13) lib/action_controller/metal/rendering.rb:10:in `process_action' actionpack (3.2.13) lib/abstract_controller/callbacks.rb:18:in `block in process_action' activesupport (3.2.13) lib/active_support/callbacks.rb:414:in `_run__956028316__process_action__416811168__callbacks' activesupport (3.2.13) lib/active_support/callbacks.rb:405:in `__run_callback' activesupport (3.2.13) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks' activesupport (3.2.13) lib/active_support/callbacks.rb:81:in `run_callbacks' actionpack (3.2.13) lib/abstract_controller/callbacks.rb:17:in `process_action' actionpack (3.2.13) lib/action_controller/metal/rescue.rb:29:in `process_action' actionpack (3.2.13) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action' activesupport (3.2.13) lib/active_support/notifications.rb:123:in `block in instrument' activesupport (3.2.13) lib/active_support/notifications/instrumenter.rb:20:in `instrument' activesupport (3.2.13) lib/active_support/notifications.rb:123:in `instrument' actionpack (3.2.13) lib/action_controller/metal/instrumentation.rb:29:in `process_action' actionpack (3.2.13) lib/action_controller/metal/params_wrapper.rb:207:in `process_action' activerecord (3.2.13) lib/active_record/railties/controller_runtime.rb:18:in `process_action' actionpack (3.2.13) lib/abstract_controller/base.rb:121:in `process' actionpack (3.2.13) lib/abstract_controller/rendering.rb:45:in `process' actionpack (3.2.13) lib/action_controller/metal.rb:203:in `dispatch' actionpack (3.2.13) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch' actionpack (3.2.13) lib/action_controller/metal.rb:246:in `block in action' actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:73:in `call' actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:73:in `dispatch' actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:36:in `call' journey (1.0.4) lib/journey/router.rb:68:in `block in call' journey (1.0.4) lib/journey/router.rb:56:in `each' journey (1.0.4) lib/journey/router.rb:56:in `call' actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:612:in `call' actionpack (3.2.13) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call' rack (1.4.5) lib/rack/etag.rb:23:in `call' rack (1.4.5) lib/rack/conditionalget.rb:25:in `call' actionpack (3.2.13) lib/action_dispatch/middleware/head.rb:14:in `call' actionpack (3.2.13) lib/action_dispatch/middleware/params_parser.rb:21:in `call' actionpack (3.2.13) lib/action_dispatch/middleware/flash.rb:242:in `call' rack (1.4.5) lib/rack/session/abstract/id.rb:210:in `context' rack (1.4.5) lib/rack/session/abstract/id.rb:205:in `call' actionpack (3.2.13) lib/action_dispatch/middleware/cookies.rb:341:in `call' activerecord (3.2.13) lib/active_record/query_cache.rb:64:in `call' activerecord (3.2.13) lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call' actionpack (3.2.13) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call' activesupport (3.2.13) lib/active_support/callbacks.rb:405:in `_run__360878605__call__248365880__callbacks' activesupport (3.2.13) lib/active_support/callbacks.rb:405:in `__run_callback' activesupport (3.2.13) lib/active_support/callbacks.rb:385:in `_run_call_callbacks' activesupport (3.2.13) lib/active_support/callbacks.rb:81:in `run_callbacks' actionpack (3.2.13) lib/action_dispatch/middleware/callbacks.rb:27:in `call' actionpack (3.2.13) lib/action_dispatch/middleware/reloader.rb:65:in `call' actionpack (3.2.13) lib/action_dispatch/middleware/remote_ip.rb:31:in `call' actionpack (3.2.13) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call' actionpack (3.2.13) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call' railties (3.2.13) lib/rails/rack/logger.rb:32:in `call_app' railties (3.2.13) lib/rails/rack/logger.rb:16:in `block in call' activesupport (3.2.13) lib/active_support/tagged_logging.rb:22:in `tagged' railties (3.2.13) lib/rails/rack/logger.rb:16:in `call' actionpack (3.2.13) lib/action_dispatch/middleware/request_id.rb:22:in `call' rack (1.4.5) lib/rack/methodoverride.rb:21:in `call' rack (1.4.5) lib/rack/runtime.rb:17:in `call' activesupport (3.2.13) lib/active_support/cache/strategy/local_cache.rb:72:in `call' rack (1.4.5) lib/rack/lock.rb:15:in `call' actionpack (3.2.13) lib/action_dispatch/middleware/static.rb:63:in `call' railties (3.2.13) lib/rails/engine.rb:479:in `call' railties (3.2.13) lib/rails/application.rb:223:in `call' rack (1.4.5) lib/rack/content_length.rb:14:in `call' railties (3.2.13) lib/rails/rack/log_tailer.rb:17:in `call' rack (1.4.5) lib/rack/handler/webrick.rb:59:in `service' C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service' C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run' C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'

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• bundle .NET dlls to run application in .NET-less machine?

  - by Camilo Martin

  AFAIK, ngen turns MSIL into native code (also reffered to as pre-JIT), however I never payed too much attention at it's startup performance impact. Ngen'd applications still require the .NET base class libraries (the runtime). Since the base class libraries have everything our .NET assemblies need (correct?) would it be possible to ship the framework's DLLs with my ngen'd application so that it does not require the runtime to be installed? (e.g., the scenario for most Windows XP machines) Oh, and please don't bother mentioning Remotesoft's Salamander Linker or Xenocode's Postbuild. They are not for my (and many's) current budget (and they seem to simply bundle the framework in a virtualized enviroinment, which means big download sizes and slow startup times I believe) EDIT: I know now, ngen doesn't do what I thought it did. But is it possible to bundle the .NET files with an application, without using a VM?

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• use ngen and bundle .NET dlls to run application in .NET-less machine?

  - by Camilo Martin

  AFAIK, ngen turns MSIL into native code (also reffered to as pre-JIT), however I never payed too much attention at it's startup performance impact. Ngen'd applications still require the .NET base class libraries (the runtime). Since the base class libraries have everything our .NET assemblies need (correct?) would it be possible to ship the framework's DLLs with my ngen'd application so that it does not require the runtime to be installed? (e.g., the scenario for most Windows XP machines) Oh, and please don't bother mentioning Remotesoft's Salamander Linker or Xenocode's Postbuild. They are not for my (and many's) current budget (and they seem to simply bundle the framework in a virtualized enviroinment, which means big download sizes and slow startup times I believe)

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• What's the best way to do base36 arithmetic in perl?

  - by DVK

  What's the best way to do base36 arithmetic in Perl? To be more specific, I need to be able to do the following: Operate on positive N-digit numbers in base 36 (e.g. digits are 0-9 A-Z) N is finite, say 9 Provide basic arithmetic, at the very least the following 3: Addition (A+B) Subtraction (A-B) Whole division, e.g. floor(A/B). Strictly speaking, I don't really need a base10 conversion ability - the numbers will 100% of time be in base36. So I'm quite OK if the solution does NOT implement conversion from base36 back to base10 and vice versa. I don't much care whether the solution is brute-force "convert to base 10 and back" or converting to binary, or some more elegant approach "natively" performing baseN operations (as stated above, to/from base10 conversion is not a requirement). My only 3 considerations are: It fits the minimum specifications above It's "standard". Currently we're using and old homegrown module based on base10 conversion done by hand that is buggy and sucks. I'd much rather replace that with some commonly used CPAN solution instead of re-writing my own bicycle from scratch, but I'm perfectly capable of building it if no better standard possibility exists. It must be fast-ish (though not lightning fast). Something that takes 1 second to sum up 2 9-digit base36 numbers is worse than anything I can roll on my own :) P.S. Just to provide some context in case people decide to solve my XY problem for me in addition to answering the technical question above :) We have a fairly large tree (stored in DB as a bunch of edges), and we need to superimpose order on a subset of that tree. The tree dimentions are big both depth- and breadth- wise. The tree is VERY actively updated (inserts and deletes and branch moves). This is currently done by having a second table with 3 columns: parent_vertex, child_vertex, local_order, where local_order is an 9-character string built of A-Z0-9 (e.g. base 36 number). Additional considerations: It is required that the local order is unique per child (and obviously unique per parent), Any complete re-ordering of a parent is somewhat expensive, and thus the implementation is to try and assign - for a parent with X children - the orders which are somewhat evenly distributed between 0 and 36**10-1, so that almost no tree inserts result in a full re-ordering.

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• WCF service with 2 Bindings and 2 Base Addresses

  - by Sean

  I have written a WCF service (I am a newb) that I want to provide 2 endpoints for (net.tcp & basicHttp) The problem comes when I try to configure the endpoints. If I configure them as seperate services, then my service names are the same which causes a problem. I have seen recomended creating shim classes (classA : MyService, and ClassB : MyService) but that seems smelly. <services> <service name="MyWcfService.MyService" behaviorConfiguration="MyWcfService.HttpBehavior"> <endpoint name="ApplicationHttp" address="Application" binding="basicHttpBinding" bindingConfiguration="HttpBinding" contract="MyWcfService.Interfaces.IMyService" /> <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" /> <host> <baseAddresses> <add baseAddress="http://localhost:8731/MyWcfService/" /> </baseAddresses> </host> </service> <service name="MyWcfService.MyService" behaviorConfiguration="MyWcfService.MyBehavior"> <endpoint name="Application" address="Application" binding="netTcpBinding" bindingConfiguration="SecuredByWindows" contract="EmsHistorianService.Interfaces.IApplicationHistorianService" /> <endpoint address="mex" binding="mexTcpBinding" contract="IMetadataExchange" /> <host> <baseAddresses> <add baseAddress="net.tcp://localhost:49153/MyWcfService" /> </baseAddresses> </host> </service> </services> I have tried using a single service with the base address integrated into the address, but that gives me errors as well <services> <service name="MyWcfService.MyService" behaviorConfiguration="MyWcfService.HttpBehavior"> <endpoint name="ApplicationHttp" address="http://localhost:8731/MyWcfService/Application" binding="basicHttpBinding" bindingConfiguration="HttpBinding" contract="MyWcfService.Interfaces.IMyService" /> <endpoint address="http://localhost:8731/MyWcfService/mex" binding="mexHttpBinding" contract="IMetadataExchange" /> <endpoint name="Application" address="net.tcp://localhost:49153/MyWcfService/Application" binding="netTcpBinding" bindingConfiguration="SecuredByWindows" contract="EmsHistorianService.Interfaces.IApplicationHistorianService" /> <endpoint address="net.tcp://localhost:49153/MyWcfService/mex" binding="mexTcpBinding" contract="IMetadataExchange" /> </service> </services> Any ideas?

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• WTF is wtf? (in WebKit code base)

  - by Motti

  I downloaded Chromium's code base and ran across the WTF namespace. namespace WTF { /* * C++'s idea of a reinterpret_cast lacks sufficient cojones. */ template<typename TO, typename FROM> TO bitwise_cast(FROM in) { COMPILE_ASSERT(sizeof(TO) == sizeof(FROM), WTF_wtf_reinterpret_cast_sizeof_types_is_equal); union { FROM from; TO to; } u; u.from = in; return u.to; } } // namespace WTF Does this mean what I think it means? Could be so, the bitwise_cast implementation specified here will not compile if either TO or FROM is not a POD and is not (AFAIK) more powerful than C++ built in reinterpret_cast. The only point of light I see here is the nobody seems to be using bitwise_cast in the Chromium project. I see there's some legalese so I'll put in the little letters to keep out of trouble. /* * Copyright (C) 2008 Apple Inc. All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

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• Invalid character in a Base-64 string when Concatenating and Url encoding a string

  - by Rob

  I’m trying to write some encryption code that is passed through a Url. For the sake of the issue I’ve excluded the actual encryption of the data and just shown the code causing the problem. I take a salt value, convert it to a byte array and then convert that to a base64 string. This string I concatenate to another base64 string (which was previously a byte array). These two base64 strings are then Url encoded. Here’s my code... using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Security.Cryptography; using System.IO; using System.Web; class RHEncryption { private static readonly Encoding ASCII_ENCODING = new System.Text.ASCIIEncoding(); private static readonly string SECRET_KEY = "akey"; private static string md5(string text) { return BitConverter.ToString(new MD5CryptoServiceProvider().ComputeHash(ASCII_ENCODING.GetBytes(text))).Replace("-", "").ToLower(); } public string UrlEncodedData; public RHEncryption() { // encryption object RijndaelManaged aes192 = new RijndaelManaged(); aes192.KeySize = 192; aes192.BlockSize = 192; aes192.Mode = CipherMode.CBC; aes192.Key = ASCII_ENCODING.GetBytes(md5(SECRET_KEY)); aes192.GenerateIV(); // convert Ivector to base64 for sending string base64IV = Convert.ToBase64String(aes192.IV); // salt value string s = "maryhadalittlelamb"; string salt = s.Substring(0, 8); // convert to byte array // and base64 for sending byte[] saltBytes = ASCII_ENCODING.GetBytes(salt.TrimEnd('\0')); string base64Salt = Convert.ToBase64String(saltBytes); //url encode concatenated base64 strings UrlEncodedData = HttpUtility.UrlEncode(base64Salt + base64IV, ASCII_ENCODING); } public string UrlDecodedData() { // decode the url encode string string s = HttpUtility.UrlDecode(UrlEncodedData, ASCII_ENCODING); // convert back from base64 byte[] base64DecodedBytes = null; try { base64DecodedBytes = Convert.FromBase64String(s); } catch (FormatException e) { Console.WriteLine(e.Message.ToString()); Console.ReadLine(); } return s; } } If I then call the UrlDecodedData method I get a “Invalid character in a Base-64 string” exception. This is generated because the base64Salt variable contains an invalid character (I’m guessing a line termination) but I can’t seem to strip it off.

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• How to create a fully qualified hyperlink to a resource dynamically?

  - by Slauma

  In ASP.NET I'd like to create a link which points to a specific Uri and send this link in an email to a user, for instance something like http://www.BlaBla.com/CustomerPortal/Order/9876. I can create the second part of the Uri /CustomerPortal/Order/9876 dynamically in code-behind. My question is: How can I create the base Uri http://www.BlaBla.com without hardcoding it in my application? Basically I want to have something like: http://localhost:1234/CustomerPortal/Order/9876 (on my development machine) http://testserver/CustomerPortal/Order/9876 (on an internal test server) http://www.BlaBla.com/CustomerPortal/Order/9876 (on the production server) So is there a way to ask the server where the application is running: "Please tell me the base Uri of the application" ? Or any other way? Thank you in advance!

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• Cast IEnumerable<Inherited> To IEnumerable<Base>

  - by david2342

  I'm trying to cast an IEnumerable of an inherited type to IEnumerable of base class. Have tried following: var test = resultFromDb.Cast<BookedResource>(); return test.ToList(); But getting error: You cannot convert these types. Linq to Entities only supports conversion primitive EDM-types. The classes involved look like this: public partial class HistoryBookedResource : BookedResource { } public partial class HistoryBookedResource { public int ResourceId { get; set; } public string DateFrom { get; set; } public string TimeFrom { get; set; } public string TimeTo { get; set; } } public partial class BookedResource { public int ResourceId { get; set; } public string DateFrom { get; set; } public string TimeFrom { get; set; } public string TimeTo { get; set; } } [MetadataType(typeof(BookedResourceMetaData))] public partial class BookedResource { } public class BookedResourceMetaData { [Required(ErrorMessage = "Resource id is Required")] [Range(0, int.MaxValue, ErrorMessage = "Resource id is must be an number")] public object ResourceId { get; set; } [Required(ErrorMessage = "Date is Required")] public object DateFrom { get; set; } [Required(ErrorMessage = "Time From is Required")] public object TimeFrom { get; set; } [Required(ErrorMessage = "Time to is Required")] public object TimeTo { get; set; } } The problem I'm trying to solve is to get records from table HistoryBookedResource and have the result in an IEnumerable<BookedResource> using Entity Framework and LINQ. UPDATE: When using the following the cast seams to work but when trying to loop with a foreach the data is lost. resultFromDb.ToList() as IEnumerable<BookedResource>; UPDATE 2: Im using entity frameworks generated model, model (edmx) is created from database, edmx include classes that reprecent the database tables. In database i have a history table for old BookedResource and it can happen that the user want to look at these and to get the old data from the database entity framework uses classes with the same name as the tables to receive data from db. So i receive the data from table HistoryBookedResource in HistoryBookedResource class. Because entity framework generate the partial classes with the properties i dont know if i can make them virtual and override. Any suggestions will be greatly appreciated.

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• I have UFW block messages from local network machines, how can I analyse if they are malicious?

  - by Trygve

  I'm getting a lot of messages in my UFW log, and I'm trying to figure out if these are malicious or just normal. A UDP broadcast is coming from a windows laptop x.x.x.191, and some from our synology disks x.x.x.{6,8,10,11}. I have not figured out which macine 114 is yet. I would appreciate some advice in how to read the log, and get the most I can out of these calls. Oct 18 17:03:34 <myusername> kernel: [ 4034.755221] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:00:11:32:06:e8:19:08:00 SRC=x.x.x.6 DST=x.x.x.169 LEN=364 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=1900 DPT=47978 LEN=344 Oct 18 17:03:34 <myusername> kernel: [ 4034.755292] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:00:11:32:1b:e8:8f:08:00 SRC=x.x.x.10 DST=x.x.x.169 LEN=366 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=1900 DPT=47978 LEN=346 Oct 18 17:03:34 <myusername> kernel: [ 4034.756444] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:c0:c1:c0:52:18:ea:08:00 SRC=x.x.x.8 DST=x.x.x.169 LEN=294 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=1900 DPT=47978 LEN=274 Oct 18 17:03:34 <myusername> kernel: [ 4034.756613] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:c0:c1:c0:52:18:ea:08:00 SRC=x.x.x.8 DST=x.x.x.169 LEN=306 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=1900 DPT=47978 LEN=286 Oct 18 17:03:34 <myusername> kernel: [ 4034.760416] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:00:11:32:1e:6a:33:08:00 SRC=x.x.x.11 DST=x.x.x.169 LEN=366 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=1900 DPT=47978 LEN=346 Oct 18 17:03:36 <myusername> kernel: [ 4036.215134] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:00:22:19:de:80:a4:08:00 SRC=x.x.x.191 DST=x.x.x.169 LEN=424 TOS=0x00 PREC=0x00 TTL=128 ID=11155 PROTO=UDP SPT=1900 DPT=47978 LEN=404 Oct 18 17:04:23 <myusername> kernel: [ 4083.853710] [UFW BLOCK] IN=eth0 OUT= MAC=01:00:5e:7f:ff:fa:00:22:19:de:80:a4:08:00 SRC=x.x.x.191 DST=239.255.255.250 LEN=652 TOS=0x00 PREC=0x00 TTL=1 ID=11247 PROTO=UDP SPT=58930 DPT=3702 LEN=632 Oct 18 17:04:24 <myusername> kernel: [ 4084.063153] [UFW BLOCK] IN=eth0 OUT= MAC=01:00:5e:7f:ff:fa:00:22:19:de:80:a4:08:00 SRC=x.x.x.191 DST=239.255.255.250 LEN=652 TOS=0x00 PREC=0x00 TTL=1 ID=11299 PROTO=UDP SPT=58930 DPT=3702 LEN=632 Oct 18 17:07:02 <myusername> kernel: [ 4242.153947] [UFW BLOCK] IN=eth0 OUT= MAC=01:00:5e:7f:ff:fa:00:22:19:de:80:a4:08:00 SRC=x.x.x.191 DST=239.255.255.250 LEN=680 TOS=0x00 PREC=0x00 TTL=1 ID=18702 PROTO=UDP SPT=58930 DPT=3702 LEN=660 Oct 18 17:07:02 <myusername> kernel: [ 4242.275788] [UFW BLOCK] IN=eth0 OUT= MAC=01:00:5e:7f:ff:fa:00:22:19:de:80:a4:08:00 SRC=x.x.x.191 DST=239.255.255.250 LEN=680 TOS=0x00 PREC=0x00 TTL=1 ID=18703 PROTO=UDP SPT=58930 DPT=3702 LEN=660 Oct 18 17:12:29 <myusername> kernel: [ 4569.073815] [UFW BLOCK] IN=eth0 OUT= MAC=01:00:5e:7f:ff:fa:00:22:19:de:80:a4:08:00 SRC=x.x.x.191 DST=239.255.255.250 LEN=680 TOS=0x00 PREC=0x00 TTL=1 ID=30102 PROTO=UDP SPT=58930 DPT=3702 LEN=660 Oct 18 17:12:29 <myusername> kernel: [ 4569.242740] [UFW BLOCK] IN=eth0 OUT= MAC=01:00:5e:7f:ff:fa:00:22:19:de:80:a4:08:00 SRC=x.x.x.191 DST=239.255.255.250 LEN=680 TOS=0x00 PREC=0x00 TTL=1 ID=30103 PROTO=UDP SPT=58930 DPT=3702 LEN=660 Oct 18 17:17:02 <myusername> kernel: [ 4841.440729] [UFW BLOCK] IN=eth0 OUT= MAC=01:00:5e:7f:ff:fa:00:22:19:de:80:a4:08:00 SRC=x.x.x.191 DST=239.255.255.250 LEN=680 TOS=0x00 PREC=0x00 TTL=1 ID=9195 PROTO=UDP SPT=58930 DPT=3702 LEN=660 Oct 18 17:17:02 <myusername> kernel: [ 4841.553211] [UFW BLOCK] IN=eth0 OUT= MAC=01:00:5e:7f:ff:fa:00:22:19:de:80:a4:08:00 SRC=x.x.x.191 DST=239.255.255.250 LEN=680 TOS=0x00 PREC=0x00 TTL=1 ID=9196 PROTO=UDP SPT=58930 DPT=3702 LEN=660 Oct 18 17:19:10 <myusername> kernel: [ 4969.294709] [UFW BLOCK] IN=eth0 OUT= MAC=01:00:5e:7f:ff:fa:00:25:36:26:02:86:08:00 SRC=x.x.x.114 DST=239.255.255.250 LEN=923 TOS=0x00 PREC=0x00 TTL=1 ID=27103 PROTO=UDP SPT=3702 DPT=3702 LEN=903 Oct 18 17:19:10 <myusername> kernel: [ 4969.314553] [UFW BLOCK] IN=eth0 OUT= MAC=01:00:5e:7f:ff:fa:00:25:36:26:02:86:08:00 SRC=x.x.x.114 DST=239.255.255.250 LEN=923 TOS=0x00 PREC=0x00 TTL=1 ID=27104 PROTO=UDP SPT=3702 DPT=3702 LEN=903 Oct 18 17:33:34 <myusername> kernel: [ 5832.431610] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:00:11:32:1b:e8:8f:08:00 SRC=x.x.x.10 DST=x.x.x.169 LEN=366 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=1900 DPT=55281 LEN=346 Oct 18 17:33:34 <myusername> kernel: [ 5832.431659] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:00:11:32:06:e8:19:08:00 SRC=x.x.x.6 DST=x.x.x.169 LEN=364 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=1900 DPT=55281 LEN=344 Oct 18 17:33:34 <myusername> kernel: [ 5832.431865] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:00:11:32:1e:6a:33:08:00 SRC=x.x.x.11 DST=x.x.x.169 LEN=366 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=1900 DPT=55281 LEN=346 Oct 18 17:33:34 <myusername> kernel: [ 5832.433024] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:c0:c1:c0:52:18:ea:08:00 SRC=x.x.x.8 DST=x.x.x.169 LEN=294 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=1900 DPT=55281 LEN=274 Oct 18 17:33:34 <myusername> kernel: [ 5832.433224] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:c0:c1:c0:52:18:ea:08:00 SRC=x.x.x.8 DST=x.x.x.169 LEN=306 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=1900 DPT=55281 LEN=286 Oct 18 17:33:37 <myusername> kernel: [ 5834.914484] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:00:22:19:de:80:a4:08:00 SRC=x.x.x.191 DST=x.x.x.169 LEN=424 TOS=0x00 PREC=0x00 TTL=128 ID=10075 PROTO=UDP SPT=1900 DPT=55281 LEN=404

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• LINQ Generic Query with inherited base class?

  - by sah302

  I am trying to write some generic LINQ queries for my entities, but am having issue doing the more complex things. Right now I am using an EntityDao class that has all my generics and each of my object class Daos (such as Accomplishments Dao) inherit it, am example: using LCFVB.ObjectsNS; using LCFVB.EntityNS; namespace AccomplishmentNS { public class AccomplishmentDao : EntityDao<Accomplishment>{} } Now my entityDao has the following code: using LCFVB.ObjectsNS; using LCFVB.LinqDataContextNS; namespace EntityNS { public abstract class EntityDao<ImplementationType> where ImplementationType : Entity { public ImplementationType getOneByValueOfProperty(string getProperty, object getValue) { ImplementationType entity = null; if (getProperty != null && getValue != null) { //Nhibernate Example: //ImplementationType entity = default(ImplementationType); //entity = Me.session.CreateCriteria(Of ImplementationType)().Add(Expression.Eq(getProperty, getValue)).UniqueResult(Of InterfaceType)() LCFDataContext lcfdatacontext = new LCFDataContext(); //Generic LINQ Query Here lcfdatacontext.GetTable<ImplementationType>(); lcfdatacontext.SubmitChanges(); lcfdatacontext.Dispose(); } return entity; } public bool insertRow(ImplementationType entity) { if (entity != null) { //Nhibernate Example: //Me.session.Save(entity, entity.Id) //Me.session.Flush() LCFDataContext lcfdatacontext = new LCFDataContext(); //Generic LINQ Query Here lcfdatacontext.GetTable<ImplementationType>().InsertOnSubmit(entity); lcfdatacontext.SubmitChanges(); lcfdatacontext.Dispose(); return true; } else { return false; } } } }             I have gotten the insertRow function working, however I am not even sure how to go about doing getOnebyValueOfProperty, the closest thing I could find on this site was: http://stackoverflow.com/questions/2157560/generic-linq-to-sql-query How can I pass in the column name and the value I am checking against generically using my current set-up? It seems like from that link it's impossible since using a where predicate because entity class doesn't know what any of the properties are until I pass them in. Lastly, I need some way of setting a new object as the return type set to the implementation type, in nhibernate (what I am trying to convert from) it was simply this line that did it: ImplentationType entity = default(ImplentationType); However default is an nhibernate command, how would I do this for LINQ? EDIT: getOne doesn't seem to work even when just going off the base class (this is a partial class of the auto generated LINQ classes). I even removed the generics. I tried: namespace ObjectsNS { public partial class Accomplishment { public Accomplishment getOneByWhereClause(Expression<Action<Accomplishment, bool>> singleOrDefaultClause) { Accomplishment entity = new Accomplishment(); if (singleOrDefaultClause != null) { LCFDataContext lcfdatacontext = new LCFDataContext(); //Generic LINQ Query Here entity = lcfdatacontext.Accomplishments.SingleOrDefault(singleOrDefaultClause); lcfdatacontext.Dispose(); } return entity; } } } Get the following error: Error 1 Overload resolution failed because no accessible 'SingleOrDefault' can be called with these arguments: Extension method 'Public Function SingleOrDefault(predicate As System.Linq.Expressions.Expression(Of System.Func(Of Accomplishment, Boolean))) As Accomplishment' defined in 'System.Linq.Queryable': Value of type 'System.Action(Of System.Func(Of LCFVB.ObjectsNS.Accomplishment, Boolean))' cannot be converted to 'System.Linq.Expressions.Expression(Of System.Func(Of LCFVB.ObjectsNS.Accomplishment, Boolean))'. Extension method 'Public Function SingleOrDefault(predicate As System.Func(Of Accomplishment, Boolean)) As Accomplishment' defined in 'System.Linq.Enumerable': Value of type 'System.Action(Of System.Func(Of LCFVB.ObjectsNS.Accomplishment, Boolean))' cannot be converted to 'System.Func(Of LCFVB.ObjectsNS.Accomplishment, Boolean)'. 14 LCF Okay no problem I changed: public Accomplishment getOneByWhereClause(Expression<Action<Accomplishment, bool>> singleOrDefaultClause) to: public Accomplishment getOneByWhereClause(Expression<Func<Accomplishment, bool>> singleOrDefaultClause) Error goes away. Alright, but now when I try to call the method via: Accomplishment accomplishment = new Accomplishment(); var result = accomplishment.getOneByWhereClause(x=>x.Id = 4) It doesn't work it says x is not declared. I also tried getOne, and various other Expression =(

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• Refactoring a leaf class to a base class, and keeping it also a interface implementation

  - by elcuco

  I am trying to refactor a working code. The code basically derives an interface class into a working implementation, and I want to use this implementation outside the original project as a standalone class. However, I do not want to create a fork, and I want the original project to be able to take out their implementation, and use mine. The problem is that the hierarchy structure is very different and I am not sure if this would work. I also cannot use the original base class in my project, since in reality it's quite entangled in the project (too many classes, includes) and I need to take care of only a subdomain of the problems the original project is. I wrote this code to test an idea how to implement this, and while it's working, I am not sure I like it: #include <iostream> // Original code is: // IBase -> Derived1 // I need to refactor Derive2 to be both indipendet class // and programmers should also be able to use the interface class // Derived2 -> MyClass + IBase // MyClass class IBase { public: virtual void printMsg() = 0; }; /////////////////////////////////////////////////// class Derived1 : public IBase { public: virtual void printMsg(){ std::cout << "Hello from Derived 1" << std::endl; } }; ////////////////////////////////////////////////// class MyClass { public: virtual void printMsg(){ std::cout << "Hello from MyClass" << std::endl; } }; class Derived2: public IBase, public MyClass{ virtual void printMsg(){ MyClass::printMsg(); } }; class Derived3: public MyClass, public IBase{ virtual void printMsg(){ MyClass::printMsg(); } }; int main() { IBase *o1 = new Derived1(); IBase *o2 = new Derived2(); IBase *o3 = new Derived3(); MyClass *o4 = new MyClass(); o1->printMsg(); o2->printMsg(); o3->printMsg(); o4->printMsg(); return 0; } The output is working as expected (tested using gcc and clang, 2 different C++ implementations so I think I am safe here): [elcuco@pinky ~/src/googlecode/qtedit4/tools/qtsourceview/qate/tests] ./test1 Hello from Derived 1 Hello from MyClass Hello from MyClass Hello from MyClass [elcuco@pinky ~/src/googlecode/qtedit4/tools/qtsourceview/qate/tests] ./test1.clang Hello from Derived 1 Hello from MyClass Hello from MyClass Hello from MyClass The question is My original code was: class Derived3: public MyClass, public IBase{ virtual void IBase::printMsg(){ MyClass::printMsg(); } }; Which is what I want to express, but this does not compile. I must admit I do not fully understand why this code work, as I expect that the new method Derived3::printMsg() will be an implementation of MyClass::printMsg() and not IBase::printMsg() (even tough this is what I do want). How does the compiler chooses which method to re-implement, when two "sister classes" have the same virtual function name? If anyone has a better way of implementing this, I would like to know as well :)

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• Retrouvez l'enregistrement du Webinar consacré à la migration et aux évolutions Oracle E-Business Suite R12

  - by Valérie De Montvallon

  Vous n’avez pas pu assister au webinar des experts Panaya et Logica consacré aux mises à jour Oracle EBS ? Nous avons pensé à vous et nous vous offrons la possibilité de visualiser l'enregistrement de l'événement. Grâce à nos intervenants - Patrice Bugeaud, Directeur Practice Oracle chez Logica, Cyril Vinger, Solution Manager chez Logica Business Consulting, David Balouka, Regional Business Manager chez Panaya et Zoharit Ben-Zvi, Consultant Solutions Oracle EBS chez Panaya - vous allez pouvoir découvrir :  Comment réduire vos risques et vos efforts lors de vos migrations Quels sont les outils à votre disposition Quels sont les bénéfices que vous pouvez attendre d’une planification et d’une gestion de projets optimisées Comment réduire et prioriser vos corrections de code Comment créer et exécuter des scripts de test EBS facilement et rapidement Regardez maintenant !

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• OO Software Architecture - base class that everything inherits from. Bad/good idea?

  - by ale

  I am reviewing a proposed OO software architecture that looks like this: Base Foo Something Bar SomethingElse Where Base is a static class. My immediate thought was that every object in any class will inherit all the methods in Base which would create a large object. Could this cause problems for a large system? The whole architecture is hierarchical.. the 'tree' is much bigger than this really. Does this sort of architecture have a name (hierarchical?!). What are the known pros and cons?

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• Rejoignez la délégation Française à San Francisco pour l'Oracle OpenWorld !

  - by Valérie De Montvallon

  Vous connaissez l'Oracle OpenWorld, un de nos plus gros événements ? Regroupant plus de 40 000 clients et partenaires, il permet à chacun de partager ses expériences au travers de 1 800 sessions. Participer à OpenWorld, c'est aussi s'informer sur la vision stratégique d'Oracle et découvrir les dernières innovations technologiques. En venant avec la délégation française, votre expérience sera largement simplifiée : rencontre avec la Direction d'Oracle France, personnalisation et optimisation de votre agenda sur place et, bien sûr, échanges qualitatifs au sein de la communauté française. Alors n'attendez plus et rejoignez-nous à l'Oracle OpenWorld du 30 septembre au 4 octobre 2012 à San Francisco. Pour plus d'informations, vous pouvez vous rendre sur la page dédiée à la délégation française d'Oracle Openworld. Et si vous avez des questions ou commentaires, vous pouvez toujours envoyer un email à la délégation française [email protected]

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• Guava 13.0 disponible, cette version du framework Java se concentre sur les Collections et les utilitaires (Base)

  Après seulement quelques mois depuis la release 12, l'équipe Guava nous propose la treizième version de son framework Java. Au programme de Guava 13.0, on note pas mal de travail autour des Collections et les utilitaires (Base), dont voici les ajouts principaux :FluentIterable.toSortedImmutableList et transformAndConcat ; ContiguousSet.create(Range, DiscreteDomain) ; Maps.synchronizedNavigableMap ; Sets.synchronizedNavigableSet ; Ordering.allEqual ; Funnels.asOutputStream, integerFunnel et longFunnel ; DoubleMath.fuzzyCompare et fuzzyEquals ; UnsignedBytes.parseUnsignedByte, toString et MAX_VALUE ; UnsignedInts.decode ; UnsignedLongs.decode ; CycleDetectingLockFactory ;

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• Cant install KB 980368 "The update is not applicable to your computer"

  - by JK01

  I'm trying to install KB 980368 A update is available that enables certain IIS 7.0 or IIS 7.5 handlers to handle requests whose URLs do not end with a period on a new Windows 2008 R2 server, but no matter which of the download packages I try, they all say "The update is not applicable to your computer" I have Windows 2008 R2 Standard on an Intel Xeon E5520. I need that KB to have extenstionless URLs in ASP.NET MVC2. How can I fix this?

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• KB2494088 Always Fails : How to get it to install (or stop trying to)?

  - by Peter K.

  I have a problem where KB2494088 (a SQL Server 2008 R2 patch) continually fails to install when I reboot my system. Downloading the manual patch and trying to apply it says: The SQL Server patch package is part of a general distribution release (GDR). This package cannot be applied since this SQL Server feature has already been patched. To continue, you must install a higher version of the SQL Server patch. Most other posts (this, this) suggest it's either a failed (or cancelled) past installation or requires a SQL server repair. I've looked at registry settings and tried the repair option, but nothing seems to work.

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• Migration of egroupware from one Ubuntu server to another

  - by Chris Schmidt

  I am new to server administration and have been attempting to migrate from one Ubuntu server to another for 4 days now. I am having a problem with migration of egroupware settings. Specifically, I need to find where knowledgebase saves the files on the local machine. I have the database set correctly and its using the previous settings. However, articles in knowledgebase are not showing images associated with them. I have tried everything to find the file on the old server that stores data files uploaded to the knowlegebase but I cannot. If there is another way to import these files, or if someone knows where they are saved, I would really appreciate the help. -Chris

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• How remove/de-index a page from Google?

  - by Jason

  On the results page when I Google "e-luminate", the 3rd and 4th link seems to point to specific directory deep within the folders which stores the images. How can I get rid of these 2 results from Google search results? How can I get Google to de-index it? I checked on the server and the folders did not seem different from other folders but these 2 paths seems to get indexed by Google. Thank you.

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• Como Exportar Crystal Reports a Excel, Word, Rich Text, PDF ó HTML

  - by jaullo

  Cuando trabajamos con reportes siempre requerimos la funcionalidad de exportación. En crystal reports para asp.net, realizar esta tarea es sumamente sencillo. Sin embargo la pregunta más grande que salta siempre, es como realizarlo utilizando código Behind. Para poder acceder a las librerias de crystal y sus componentes, primero debemos importar los espacios de nombres: Normal 0 21 false false false ES X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabla normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} Imports CrystalDecisions.CrystalReports.Engine Imports CrystalDecisions.Shared  CrystalDecisions.CrystalReports.Engine, nos servirá para poder manejar nuestro reportDocument y CrystalDecisions.Shared, será el medio que utilicemos para la exportación. Así que, veamos como podemos exportar nuestro informe sin tener que enviarlo a la impresora, recordemos que por defecto crystal reports ya tiene la opcion de exportar a PDF sin embargo debemos hacerlo tal como si fueramos a imprimir y que es lo que evitaremos acá. Colocamos un botón en nuestra pagina asp Normal 0 21 false false false ES X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabla normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} <asp:Button ID="btntopdf" runat="server" Text="Exportar a PDF" /> Y en nuestro boton deberemos ejecutar la siguiente rutina: Normal 0 21 false false false ES X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabla normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} Protected Sub btntodpf_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btntopdf.Click          'Cargar reporte. Enlazando a la fuente de datos.        LoadReporte()          'Mas adelante veremos que estas lineas las podemos obviar        Response.Buffer = False        Response.Clear()  'ClearContent, ClearHeaders          reporteDoc.ExportToHttpResponse(ExportFormatType.PortableDocFormat, Response, True, "NombreArchivo")       End Sub LoadReport, es el encargado de llenar nuestro crystal con la fuente de datos. Está fue la primer forma de exporta nuestro crystal reports, pero no es la única, así que vamos a ver otra forma en la cual utilizaremos el metodo v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} Normal 0 false 21 false false false ES X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabla normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} ExportToHttpResponse  Para este metodo, nuestro código en el botón cambia relativamente, pero antes de ello, daremos un repaso a los metodos utilizados. Nuestro primer parametro FormatType es un valor de tipo ExportFormatType, que puede corresponder a cualquiera de los metodos que enumeramos a continuación: CrystalReport: El formato al cual se exporta es de Tipo CrystalReport. Excel: El formato al cual se exporta es de tipo Excel ExcelRecord: El formato al cual se exporta es de Tipo Excel Record. NoFormat: No se ha especificado un formato de exportación. PortableDocFormat: El formato al cual se exporta es de Tipo PDF.  No voy a enumerar todos, pues me imagino que ya sabrán la idea de cada uno de los formatos, los numerados arriba son los mas importantes. Nuestro segundo parametro el objeto response nos permite adozar el archivo. Y por último, nuestro tercer parametro, definirá si debe ir como un objeto adjunto o no. Si lo colocamos en TRUE, estaremos enviando nuestro archivo como parametro, esto hará que no necesitemos las siguientes líneas de código: Normal 0 21 false false false ES X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabla normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} Response.Buffer = False Response.Clear()   Con esto realizado, ya contamos con la posibilidad de enviar el archivo directamente al cliente.   Ahora si, veamos cuanto se ha reducido nuestro código: Unicamente nos quedan dos líneas de código en nuestro botón Normal 0 21 false false false ES X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabla normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;}        'Cargar reporte. Enlazando a la fuente de datos.        LoadReport()          reporteDoc.ExportToHttpResponse(ExportFormatType.PortableDocFormat, Response, True, "NombreArchivo")   Para finalizar, nada mas decir que espero esto les sea de ayuda y por supuesto,  que les facilite la vida con el uso de crystal reports.

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• Google Top Geek E05

  Google Top Geek E05 In Spanish! Google Top Geek (GTG) es un show semanal que generamos desde México con noticias, las tendencias en búsquedas y YouTube en América Latina, así como referencias a apps y eventos interesantes. GTG se transmite los lunes al medio día, 12 pm, desde Google Developers Live. Guión del programa Esta semana 1. Geeks interactuando y socializando en el mundo real, eso justamente es lo que ha logrado el juego masivo Ingress que liberó Google recientemente. Tienen que escoger un bando: resistance o enlightened, el proyecto Niantic. Campos de energía, elementos, intriga, combate, ... Y lo mejor de todo: mucha diversión. Cuando obtengan su código, si están del lado correcto, pueden encontrarnos en Ingress Enlightened Latin America +page en Google+. 2. Reality show para desarrolladores en Argentina: +Next Level, 40 estudiantes y profesionales de TI trabajarán siete días con cámaras todo el tiempo, expertos de toda América Latina via Google Hangouts... Del 26 de noviembre al 2 de diciembre, en la ciudad de Tandil. 3. Google Apps for Business Un tema relativamente nuevo en el mundo empresarial en nuestra región es la nube y cómo aprovecharla mejor. Google Apps for Business es un servicio basado en la nube que provee Mensajería y Colaboración a través de los productos que todos conocemos de Google pero con el nivel de controles y auditoría que requieren las empresas. El enfoque de Google es y siempre ha sido la satisfacción de nuestros usuarios y Google Apps for Business le <b>...</b> From: GoogleDevelopers Views: 1 0 ratings Time: 15:39 More in Science & Technology

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