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  • Type hinting for functions in Clojure

    - by mikera
    I'm trying to resolve a reflection warning in Clojure that seems to result from the lack of type inference on function return values that are normal Java objects. Trivial example code that demonstrates the issue: (set! *warn-on-reflection* true) (defn foo [#^Integer x] (+ 3 x)) (.equals (foo 2) (foo 2)) => Reflection warning, NO_SOURCE_PATH:10 - call to equals can't be resolved. true What is the best way to solve this? Can this be done with type hints?

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  • How can I make a permanently updated copy of a file in a different place to the original file?

    - by Mark
    I use two computers, a Linux one for coding and building and a Windows one which has the programming application to load the built program onto the hardware. Both computers have access to a network drive which I use to pass the files from Linux to Windows. My problem is, that every time I build I have to copy the files from where the are created to the network drive. How can I make some sort of file in the network drive on Ubuntu that always mirrors the file which is built in the different location, like a pointer? Thanks!

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  • Cannot access system after deleting passwd file

    - by joao rodrigo leao
    I was trying to change my user name and also my /home/username and my system started to crash. I deleted the passwd file but I had a backup named passwd_bkp. I tried to rename this passwd_bkp as passwd and it did not work. No commands were being executed... I was in a terminal window. I re-started my system and now I cannot login. The GRub loads two options: Linux and recovery mode. I tried to open a sessions as root but it says the file system is corrupted. I cannot access my files. Did I lose all my files?

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  • Run a .sql script file in C#

    - by SAMIR BHOGAYTA
    using System.Data.SqlClient; using System.IO; using Microsoft.SqlServer.Management.Common; using Microsoft.SqlServer.Management.Smo; namespace ConsoleApplication1 { class Program { static void Main(string[] args) { string sqlConnectionString = "Data Source=(local);Initial Catalog=AdventureWorks;Integrated Security=True"; FileInfo file = new FileInfo("C:\\myscript.sql"); string script = file.OpenText().ReadToEnd(); SqlConnection conn = new SqlConnection(sqlConnectionString); Server server = new Server(new ServerConnection(conn)); server.ConnectionContext.ExecuteNonQuery(script); } } }

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  • Custom extensible file format for 2d tiled maps

    - by Christian Ivicevic
    I have implemented much of my game logic right now, but still create my maps with nasty for-loops on-the-fly to be able to work with something. Now I wanted to move on and to do some research on how to (un)serialize this data. (I do not search for a map editor - I am speaking of the map file itself) For now I am looking for suggestions and resources, how to implement a custom file format for my maps which should provide the following functionality (based on MoSCoW method): Must have Extensibility and backward compatibility Handling of different layers Metadata on whether a tile is solid or can be passed through Special serialization of entities/triggers with associated properties/metadata Could have Some kind of inclusion of the tileset to prevent having scattered files/tilesets I am developing with C++ (using SDL) and targetting only Windows. Any useful help, tips, suggestions, ... would be appreciated!

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  • Cannot convert lambda expression to type 'string' because it is not a delegate type

    - by RememberME
    I have the following code written by another developer on 2 pages of my site. This used to work just fine, but now is giving the error "Cannot convert lambda expression to type 'string' because it is not a delegate type" on the Delete line with Ajax.ThemeRollerActionLink. I don't go into this section of the site often, and we recently upgraded from MVC 1.0 to 2.0. I'm guessing that's probably when it stopped working. I've looked up this error and the recommended fix seems to be add using System.Linq However, the page already has <%@ Import Namespace="System.Linq" %> <% Html.Grid(Model).Columns(col => { col.For(c => "<a href='" + Url.Action("Edit", new { userName = c }) + "' class=\"fg-button fg-button-icon-solo ui-state-default ui-corner-all\"><span class=\"ui-icon ui-icon-pencil\"></span></a>").Named("Edit").DoNotEncode(); col.For(c => Ajax.ThemeRollerActionLink("fg-button fg-button-icon-solo ui-state-default ui-corner-all", "ui-icon ui-icon-close", "Delete", new { userName = c }, new AjaxOptions { Confirm = "Delete User?", HttpMethod = "Delete", InsertionMode = InsertionMode.Replace, UpdateTargetId = "gridcontainer", OnSuccess = "successDeleteAssignment", OnFailure = "failureDeleteAssignment" })).Named("Delete").DoNotEncode(); col.For(c => c).Named("User"); }).Attributes(id => "userlist").Render(); %>

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  • How to specialize template for type derived from particular type

    - by relaxxx
    I have class World which manages creation of object... After creation it calls afterCreation method and I the created object is user-defined type derived from Entity (eg. MyEntity), I want to call addEntity. I the object was something else, I want to do nothing. addEntity must be called with appropriate T, because it generates unique IDs for every derived class etc. Here is my solution: template <int v> struct ToType { enum { value = v }; }; template <typename T> void World::afterCreation(T * t) { afterCreation(t, ToType<std::is_base_of<Entity, T>::value>()); } template <typename T> void World::afterCreation(T * t, ToType<true>) { addEntity(t); //here I cant pass Entity *, I need the real type, eg. MyEntity } template <typename T> void World::afterCreation(T * t, ToType<false>) { } My question is - Can in be done better way? How can I simulate following code without ToType or similar? template <typename T> void afterCreation(){/*generic impl*/} template <typename T where T is derived from Entity> void afterCreation(){/*some specific stuff*/} "specialize" in the title is only to describe my intention, no need to solve problem with template specialization

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  • Upgrading MySQL causes errors

    - by user1032531
    I am running Centos 5.8 (Linux 2.6.18-308.13.1.el5 on x86_64), and wish to upgrade MySQL version 5.0.95. I am using a tutorial found at http://www.if-not-true-then-false.com/2010/install-mysql-on-fedora-centos-red-hat-rhel/. When I get to the following, I get the host of errors. Seems to have something to do with going from 386 to 86x64. Can anyone help? Thanks yum --enablerepo=remi,remi-test update mysql mysql-server Transaction Check Error: file /etc/my.cnf from install of mysql50-5.0.96-2.ius.el5.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/info/mysql.info.gz from install of mysql50-5.0.96-2.ius.el5.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysql.1.gz from install of mysql50-5.0.96-2.ius.el5.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysqlaccess.1.gz from install of mysql50-5.0.96-2.ius.el5.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysqladmin.1.gz from install of mysql50-5.0.96-2.ius.el5.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysqldump.1.gz from install of mysql50-5.0.96-2.ius.el5.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysqlshow.1.gz from install of mysql50-5.0.96-2.ius.el5.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /etc/my.cnf from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/charsets/Index.xml from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/charsets/cp1250.xml from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/charsets/cp1251.xml from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/czech/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/danish/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/dutch/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/english/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/estonian/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/french/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/german/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/greek/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/hungarian/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/italian/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/japanese/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/korean/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/norwegian-ny/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/norwegian/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/polish/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/portuguese/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/romanian/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/russian/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/serbian/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/slovak/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/spanish/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/swedish/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/ukrainian/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/bin/mysqlaccess from install of mysql-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/my_print_defaults.1.gz from install of mysql-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysql.1.gz from install of mysql-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysql_config.1.gz from install of mysql-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysql_find_rows.1.gz from install of mysql-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysql_waitpid.1.gz from install of mysql-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysqlaccess.1.gz from install of mysql-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysqladmin.1.gz from install of mysql-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysqldump.1.gz from install of mysql-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysqlshow.1.gz from install of mysql-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386

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  • System.IO.IOException: file used by another process

    - by Srodriguez
    Dear all, I've been working in this small piece of code that seems trivial but still i cannot really see where is the problem. My functions does a pretty simple thing. Opens a file, copy its contents, replace a string inside and copy it back to the original file (a simple search and replace inside a text file then). I didn't really know how to do that as I'm adding lines to the original file, so i just create a copy of the file, (file.temp) copy also a backup (file.temp) then delete the original file(file) and copy the file.temp to file. I get an exception while doing the delete of the file. Here is the sample code: private static bool modifyFile(FileInfo file, string extractedMethod, string modifiedMethod) { Boolean result = false; FileStream fs = new FileStream(file.FullName + ".tmp", FileMode.Create, FileAccess.Write); StreamWriter sw = new StreamWriter(fs); StreamReader streamreader = file.OpenText(); String originalPath = file.FullName; string input = streamreader.ReadToEnd(); Console.WriteLine("input : {0}", input); String tempString = input.Replace(extractedMethod, modifiedMethod); Console.WriteLine("replaced String {0}", tempString); try { sw.Write(tempString); sw.Flush(); sw.Close(); sw.Dispose(); fs.Close(); fs.Dispose(); streamreader.Close(); streamreader.Dispose(); File.Copy(originalPath, originalPath + ".old", true); FileInfo newFile = new FileInfo(originalPath + ".tmp"); File.Delete(originalPath); File.Copy(fs., originalPath, true); result = true; } catch (Exception ex) { Console.WriteLine(ex); } return result; }` And the related exception System.IO.IOException: The process cannot access the file 'E:\mypath\myFile.cs' because it is being used by another process. at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) at System.IO.File.Delete(String path) at callingMethod.modifyFile(FileInfo file, String extractedMethod, String modifiedMethod) Normally these errors come from unclosed file streams, but I've taken care of that. I guess I've forgotten an important step but cannot figure out where. Thank you very much for your help,

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  • Windows Server 2003 R2 Standard: Locks MS Office files, but not Adobe .AI and .PSD files?

    - by Bruce Garlock
    We have some shares setup on a Windows 2003 R2 server, and the MS Office files people save behave properly: The first person to open the file gets read/write, and the second person to open the file while the first person still has the file open, gets a read-only version. This is not true for the graphics files, like Adobe Illustrator .AI files, and Photoshop .PSD files. Anyone who goes to open these files has full read/write, even if someone else is already working on the file! This has lead to numerous file corruption issues, as well as other lost work, since it always saves the last changes to the file. How do we get Windows to properly lock these files so when someone is working on a file, and someone else wants to open one, they get read-only access? Many thanks, Bruce

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  • Asp.Net MVC2 RenderAction changes page mime type?

    - by Gabe Moothart
    It appears that calling Html.RenderAction in Asp.Net MVC2 apps can alter the mime type of the page if the child action's type is different than the parent action's. The code below (testing in MVC2 RTM), which seems sensible to me, will return a result of type application/json when calling Home/Index. Instead of dispylaying the page, the browser will barf and ask you if you want to download it. My question: Am I missing something? Is this a bug? If so, what's the best workaround? controller: public class HomeController : Controller { public ActionResult Index() { ViewData[ "Message" ] = "Welcome to ASP.NET MVC!"; return View(); } [ChildActionOnly] public JsonResult States() { string[] states = new[] { "AK", "AL", "AR", "AZ", }; return Json(states, JsonRequestBehavior.AllowGet); } } view: <h2><%= Html.Encode(ViewData["Message"]) %></h2> <p> To learn more about ASP.NET MVC visit <a href="http://asp.net/mvc" title="ASP.NET MVC Website">http://asp.net/mvc</a>. </p> <script> var states = <% Html.RenderAction("States"); %>; </script>

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  • Programmatically copying custom content type and columns from one web to another

    - by BeraCim
    Hi all: I'm experiencing a very stubborn problem when copying custom content type and its columns from one web to another within the same site. Basically, this is the code that I have: foreach (SPField field in existingWeb.Fields) { if (!destinationWeb.Fields.ContainsField(field.Title)) { destinationWeb.Fields.AddFieldAsXml(field.SchemaXml); destinationWeb.Update(); } } foreach (SPContentType existingWebCt in destinationWeb.ContentType) { SPContentType newContentType = new SPContentType(existingWebCt.Parent, destinationWeb.ContentTypes, existingWebCt.Name); foreach (SPFieldLink fieldLink in existingWebCt.FieldLinks) { SPField sourceField = existingWebCt.Fields[fieldLink.Id]; if (destinationWeb.Fields.ContainsField(sourceField.Title)) { SPFieldLink destinationWebFieldLink = new SPFieldLink(destinationWeb.Fields[sourceField.Title]); newContentType.FieldLinks.Add(destinationWebFieldLink); } } } existingWeb and destinationWeb are 2 webs within the same site. The code runs fine. But the problem is that in the SITE Content Type screen (under site settings), when I click the custom column link in the custom content type, I got an error saying: Invalid field name {UID}. The UID is the same UID as the custom column in the existing site. I checked with my web settings after completion. I can see the custom list (which I created with an item for testing purpose), but the custom column is gone from the view (though the actual data is still there... just have to check the box to get it to display). But I think that is less important... more of fyi. I've also gotten a variety of different exceptions should I copy things wrongly. Google has failed to help me out on this one. Does anyone know what I'm missing in order to get that link to work again? Thanks.

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  • Info on type family instances

    - by yairchu
    Intro: While checking out snoyman's "persistent" library I found myself wanting ghci's (or another tool) assistance in figuring out stuff. ghci's :info doesn't seem to work as nicely with type-families and data-families as it does with "plain" types: > :info Maybe data Maybe a = Nothing | Just a -- Defined in Data.Maybe ... > :info Persist.Key Potato -- "Key Potato" defined in example below data family Persist.Key val -- Defined in Database.Persist ... (no info on the structure/identity of the actual instance) One can always look for the instance in the source code, but sometimes it could be hard to find it and it may be hidden in template-haskell generated code etc. Code example: {-# LANGUAGE FlexibleInstances, GeneralizedNewtypeDeriving, MultiParamTypeClasses, TypeFamilies, QuasiQuotes #-} import qualified Database.Persist as Persist import Database.Persist.Sqlite as PSqlite PSqlite.persistSqlite [$persist| Potato name String isTasty Bool luckyNumber Int UniqueId name |] What's going on in the code example above is that Template-Haskell is generating code for us here. All the extensions above except for QuasiQuotes are required because the generated code uses them. I found out what Persist.Key Potato is by doing: -- test.hs: test = PSqlite.persistSqlite [$persist| ... -- ghci: > :l test.hs > import Language.Haskell.TH > import Data.List > runQ test >>= putStrLn . unlines . filter (isInfixOf "Key Potato") . lines . pprint where newtype Database.Persist.Key Potato = PotatoId Int64 type PotatoId = Database.Persist.Key Potato Question: Is there an easier way to get information on instances of type families and data families, using ghci or any other tool?

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  • Finding a MIME type for a file on windows

    - by rmeador
    Is there a way to get a file's MIME type using some system call on Windows? I'm writing an IIS extension in C++, so it must be callable from C++, and I do have access to IIS if there is some functionality exposed. Obviously, IIS itself must be able to do this, but my googling has been unable to find out how. I did find this .net related question here on SO, but that doesn't give me much hope (as neither a good solution nor a C++ solution is mentioned there). I need it so I can serve up dynamic files using the appropriate content type from my app. My plan is to first consult a list of MIME types within my app, then fall back to the system's MIME type listing (however that works; obviously it exists since it's how you associate files with programs). I only have a file extension to work with in some cases, but in other cases I may have an actual on-disk file to examine. Since these will not be user-uploaded files, I believe I can trust the extension and I'd prefer an extension-only lookup solution since it seems simpler and faster. Thanks!

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  • Java: Generics, Class.isaAssignableFrom, and type casting

    - by bguiz
    This method that uses method-level generics, that parses the values from a custom POJO, JXlistOfKeyValuePairs (which is exactly that). The only thing is that both the keys and values in JXlistOfKeyValuePairs are Strings. This method wants to taken in, in addition to the JXlistOfKeyValuePairs instance, a Class<T> that defines which data type to convert the values to (assume that only Boolean, Integer and Float are possible). It then outputs a HashMap with the specified type for the values in its entries. This is the code that I have got, and it is obviously broken. private <T extends Object> Map<String, T> fromListOfKeyValuePairs(JXlistOfKeyValuePairs jxval, Class<T> clasz) { Map<String, T> val = new HashMap<String, T>(); List<Entry> jxents = jxval.getEntry(); T value; String str; for (Entry jxent : jxents) { str = jxent.getValue(); value = null; if (clasz.isAssignableFrom(Boolean.class)) { value = (T)(Boolean.parseBoolean(str)); } else if (clasz.isAssignableFrom(Integer.class)) { value = (T)(Integer.parseInt(str)); } else if (clasz.isAssignableFrom(Float.class)) { value = (T)(Float.parseFloat(str)); } else { logger.warn("Unsupporteded value type encountered in key-value pairs, continuing anyway: " + clasz.getName()); } val.put(jxent.getKey(), value); } return val; } This is the bit that I want to solve: if (clasz.isAssignableFrom(Boolean.class)) { value = (T)(Boolean.parseBoolean(str)); } else if (clasz.isAssignableFrom(Integer.class)) { value = (T)(Integer.parseInt(str)); } I get: Inconvertible types required: T found: Boolean Also, if possible, I would like to be able to do this with more elegant code, avoiding Class#isAssignableFrom. Any suggestions? Sample method invocation: Map<String, Boolean> foo = fromListOfKeyValuePairs(bar, Boolean.class);

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  • Type result with Ternary operator in C#

    - by Vaccano
    I am trying to use the ternary operator, but I am getting hung up on the type it thinks the result should be. Below is an example that I have contrived to show the issue I am having: class Program { public static void OutputDateTime(DateTime? datetime) { Console.WriteLine(datetime); } public static bool IsDateTimeHappy(DateTime datetime) { if (DateTime.Compare(datetime, DateTime.Parse("1/1")) == 0) return true; return false; } static void Main(string[] args) { DateTime myDateTime = DateTime.Now; OutputDateTime(IsDateTimeHappy(myDateTime) ? null : myDateTime); Console.ReadLine(); ^ } | } | // This line has the compile issue ---------------+ On the line indicated above, I get the following compile error: Type of conditional expression cannot be determined because there is no implicit conversion between '< null ' and 'System.DateTime' I am confused because the parameter is a nullable type (DateTime?). Why does it need to convert at all? If it is null then use that, if it is a date time then use that. I was under the impression that: condition ? first_expression : second_expression; was the same as: if (condition) first_expression; else second_expression; Clearly this is not the case. What is the reasoning behind this? (NOTE: I know that if I make "myDateTime" a nullable DateTime then it will work. But why does it need it? As I stated earlier this is a contrived example. In my real example "myDateTime" is a data mapped value that cannot be made nullable.)

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  • How to use a class's type as the type argument for an inherited collection property in C#

    - by Edelweiss Peimann
    I am trying to create a representation of various types of card that inherit from a generic card class and which all contain references to their owning decks. I tried re-declaring them, as suggested here, but it still won't convert to the specific card type. The code I currently have is as such: public class Deck<T> : List<T> where T : Card { void Shuffle() { throw new NotImplementedException("Shuffle not yet implemented."); } } public class Card { public Deck<Card> OwningDeck { get; set; } } public class FooCard : Card { public Deck<FooCard> OwningDeck { get { return (Deck<FooCard>)base.OwningDeck; } set { OwningDeck = value; } } } The compile-time error I am getting: Error 2 Cannot convert type 'Game.Cards.Deck' to 'Game.Cards.Deck' And a warning suggesting I use a new operator to specify that the hiding is intentional. Would doing so be a violation of convention? Is there a better way? My question to stackoverflow is this: Can what I am trying to do be done elegantly in the .NET type system? If so, can some examples be provided?

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  • File locked / read-only

    - by oshirowanen
    On a networked computer, I have a file which is coming up as read-only because someone else has it open. This is not true. This is a file stored locally on the computer and it is not being used by anyone else. I can login to the same computer using a different user, and the file opens up fine. I just get the issue with a particular user account. Other than deleting theses account/profile and creating it again, how can I unlock this file? Double clicking on this file gives me a message saying The file is locked for editing by another user, or the file (or the folder in which it is located,) is marked as read-only, or you specified that you wanted to open this file read-only. I don't think the folder is locked, because I can use other files in that folder fine, it's just 1 particular file which is causing this issue. I know that only 1 user is using this file as the file is on his c: and the same file works fine if he logs off to allow another user to log in.

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  • Using a type parameter and a pointer to the same type parameter in a function template

    - by Darel
    Hello, I've written a template function to determine the median of any vector or array of any type that can be sorted with sort. The function and a small test program are below: #include <algorithm> #include <vector> #include <iostream> using namespace::std; template <class T, class X> void median(T vec, size_t size, X& ret) { sort(vec, vec + size); size_t mid = size/2; ret = size % 2 == 0 ? (vec[mid] + vec[mid-1]) / 2 : vec[mid]; } int main() { vector<double> v; v.push_back(2); v.push_back(8); v.push_back(7); v.push_back(4); v.push_back(9); double a[5] = {2, 8, 7, 4, 9}; double r; median(v.begin(), v.size(), r); cout << r << endl; median(a, 5, r); cout << r << endl; return 0; } As you can see, the median function takes a pointer as an argument, T vec. Also in the argument list is a reference variable X ret, which is modified by the function to store the computed median value. However I don't find this a very elegant solution. T vec will always be a pointer to the same type as X ret. My initial attempts to write median had a header like this: template<class T> T median(T *vec, size_t size) { sort(vec, vec + size); size_t mid = size/2; return size % 2 == 0 ? (vec[mid] + vec[mid-1]) / 2 : vec[mid]; } I also tried: template<class T, class X> X median(T vec, size_t size) { sort(vec, vec + size); size_t mid = size/2; return size % 2 == 0 ? (vec[mid] + vec[mid-1]) / 2 : vec[mid]; } I couldn't get either of these to work. My question is, can anyone show me a working implementation of either of my alternatives? Thanks for looking!

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  • Converting non-generic List type to Generic List type in Java 1.5

    - by Shaun F
    I have a List that is guaranteed to contain just one type object. This is created by some underlying code in a library that I cannot update. I want to create a List<ObjectType> based on the incoming List object so that my calling code is talking to List<ObjectType>. What's the best way to convert the List (or any other object collection) to a List<ObjectType>.

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  • 1067: Implicit coercion of a value of type theplayclass to an unrelated type main

    - by Minelava
    I need help because I want to create a gameover screen that display score. However, there's an error that prevent me from transferring the score from theplayclass.as to thegameoverclass.as. Are there ways to pass a value to another movieclip without causing any errors. I refer the source code from this website : http://www.emanueleferonato.com/2008/12/17/designing-the-structure-of-a-flash-game-as3-version/ Here's the error C:\Users\xxx\Downloads\Migrate\test\theplayclass.as, Line 54, Column 41 1067: Implicit coercion of a value of type theplayclass to an unrelated type main. main.as package { import flash.display.MovieClip; import flash.events.Event; public class main extends MovieClip { public var playClass:theplayclass; public var gameOverClass:thegameoverclass; public function main() { showWin(); } public function showWin() { playClass = new theplayclass(this); addChild(playClass); } public function showGameOver() { gameOverClass = new thegameoverclass(this); addChild(gameOverClass); removeChild(playClass); playClass = null; } } } theplayclass.as package { import flash.display.MovieClip; import flash.events.*; public class theplayclass extends MovieClip { private var mainClass:main; var gameScore:Number; var gameOverScore:thegameoverclass; public function theplayclass(passedClass:main) { mainClass = passedClass; scoreText.text ="0"; gameScore = 0; win.addEventListener(MouseEvent.CLICK, showwinFunction); next.addEventListener(MouseEvent.CLICK, showgameoverFunction); addEventListener(Event.ADDED_TO_STAGE, addToStage); addEventListener(Event.ENTER_FRAME, changeScore); } public function addToStage(e:Event):void { this.x = 0; this.y = 0; } private function showwinFunction(e:MouseEvent):void { gameScore+=50; } private function changeScore(e:Event):void { scoreText.text =""+gameScore; } public function showgameoverFunction(e:MouseEvent) { mainClass.showGameOver(); gameOverScore = new thegameoverclass(this); gameOverScore.setTextScore(gameScore); } } } thegameoverclass.as package { import flash.display.MovieClip; import flash.events.MouseEvent; import flash.events.*; public class thegameoverclass extends MovieClip { var mainClass:main; var scorePoints:Number; public function thegameoverclass(passedClass:main) { mainClass = passedClass; finalScore.text = "test"; } public function setTextScore(textToSet:Number) { finalScore.text = ""+scorePoints; } } }

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