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  • Is this a good code (came across while reading code of a colleague)

    - by eriks
    // file a.hpp class a; typedef boost::shared_ptr<a> aPtr class a{ public: static aPtr CreateImp(); virtual void Foo() = 0 ; .... }; //file aImp.hpp class aImp : public a{ virtual void Foo(); }; //file aImp.cpp aPtr a::CreateImp() { return aPtr(new aImp()); } void aImp::Foo(){} The client must use CreateImp to get ptr to 'a', and can't use 'a' other ways. What do you think about this implementation? what do you think about this king of implementation?

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  • How can I use aliased commands with xargs?

    - by Nathan Fellman
    I have the following alias in my .aliases: alias gi grep -i and I want to look for foo case-insensitively in all the files that have the string bar in their name: find -name \*bar\* | xargs gi foo This is what I get: xargs: gi: No such file or directory Is there any way to use aliases in xargs, or do I have to use the full version: find -name \*bar\* | xargs grep -i foo Note: This is a simple example. Besides gi I have some pretty complicated aliases that I can't expand manually so easily. Edit: I used tcsh, so please specify if an answer is shell-specific.

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  • map xml element to xsd complexType based on attribute

    - by Joshua Johnson
    Assume there exists an XML instance document that looks like this: <root> <object type="foo"> <!-- ... --> </object> <object type="bar"> <!-- ... --> </object> </root> My goal is to have a small (static) schema that verifies proper <element type="xxx" /> syntax for objects, and another schema (more prone to change) that verifies the contents of each object element against a complexType that matches the type attribute: <complexType name="foo"><!--should match object with type="foo"--></complexType> <complexType name="bar"><!--should match object with type="bar"--></complexType> What is the best way to accomplish this (or something similar)?

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  • rails override default getter for a relationship (belongs_to)

    - by brad
    So I know how to override the default getters for attributes of an ActiveRecord object using def custom_getter return self[:custom_getter] || some_default_value end I'm trying to achieve the same thing however for a belongs to association. For instance. class Foo < AR belongs_to :bar def bar return self[:bar] || Bar.last end end class Bar < AR has_one :foo end When I say: f = Foo.last I'd like to have the method f.bar return the last Bar, rather than nil if that association doesn't exist yet. This doesn't work however. The reason is that self[:bar] is always undefined. It's actually self[:bar_id]. I can do something naive like: def bar if self[:bar_id] return Bar.find(self[:bar_id]) else return Bar.last end end However this will always make a db call, even if Bar has already been fetched, which is certainly not ideal. Does anyone have an insight as to how I might have a relationship such that the belongs_to attribute is only loaded once and has a default value if not set.

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  • C# 4: conflicting overloaded methods with optional parameters

    - by Thomas
    I have two overloaded methods, one with an optional parameter. void foo(string a) { } void foo(string a, int b = 0) { } now I call: foo("abc"); interestingly the first overload is called. why not the second overload with optional value set to zero? To be honest, I would have expect the compiler to bring an error, at least a warning to avoid unintentional execution of the wrong method. What's the reason for this behaviour? Why did the C# team define it that way? Thanks for your opinions!

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  • Eclipse (Springsource Tool Suite 2.3.1) can't resolve dependencies for classes in the same package

    - by Steve
    This started happening when I upgraded my Springsource Toolsuite from 2.3 to 2.3.1. Essentially whenever I do anything, such as open a file, change a file, etc, I have to do a clean. Everything works fine when I do mvn commands on the command line, which leads me to believe that Eclipse is looking in the wrong place for compiled code or something along those lines, although that is entirely superstitious at this point. Example: I make a change to com.foo.mypackage.MyClass. Suddenly a bunch of tests that excercise MyClass get the red x - for class not found! In src/main/test: com.foo.DbUnitTest com.foo.mypackage.FooTest extends DbUnitTest DbUnitTest gets a class not found. I do a clean, and everything is fine. I touch something, and it breaks again :(. I don't really know where to begin on how to troubleshoot this.

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  • Amazon S3 Add METADATA to existing KEY

    - by Daveo
    In S3 REST API I am adding metadata to an existing object by using the PUT (Copy) command and copying a key to the same location with 'x-amz-metadata-directive' = 'REPLACE' What I want to do is change the download file name by setting: Content-Disposition: attachment; filename=foo.bar; This sets the metadata correctly but when I download the file it still uses the keyname instead of 'foo.bar' I use a software tool S3 Browser to view the metadata and it looks correct (apart from 'Content-Disposition' being all lower case as that's was S3 ask me to sign) Then using S3 Browser I just pressed, then save without changing anything and now it works??? What am I missing how come setting a metadata 'Content-Disposition: attachment; filename=foo.bar;' from my web app does not work but does work from S3 Browser?

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  • Using a member function pointer within a class

    - by neuviemeporte
    Given an example class: class Fred { public: Fred() { func = &Fred::fa; } void run() { int foo, bar; *func(foo,bar); } double fa(int x, int y); double fb(int x, int y); private: double (Fred::*func)(int x, int y); }; I get a compiler error at the line calling the member function through the pointer "*func(foo,bar)", saying: "term does not evaluate to a function taking 2 arguments". What am I doing wrong?

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  • Groovy MetaClass - Add category methods to appropriate metaClasses

    - by noah
    I have several categories that I use in my Grails plugin. e.g., class Foo { static foo(ClassA a,Object someArg) { ... } static bar(ClassB b,Object... someArgs) { ... } } I'm looking for the best way to add these methods to the meta-classes so that I don't have to use the category classes and can just invoke them as instance methods. e.g., aInstance.foo(someArg) bInstance.bar(someArgs) Is there a Groovy/Grails class or method that will help me do this or am I stuck iterating through the methods and adding them all myself?

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  • Zend_Test_PHPUnit_ControllerTestCase: Test view parameters and not rendered output

    - by erenon
    Hi, I'm using Zend_Test_PHPUnit_ControllerTestCase to test my controllers. This class provides various ways to test the rendered output, but I don't want to get my view scripts involved. I'd like to test my view's vars. Is there a way to access to the controllers view object? Here is an example, what I'm trying to do: <?php class Controller extends Zend_Controller_Action { public function indexAction() { $this-view->foo = 'bar'; } } class ControllerTest extends Zend_Test_PHPUnit_ControllerTestCase { public function testShowCallsServiceFind() { $this->dispatch('/controller'); //doesn't work, there is no such method: $this->assertViewVar('foo', 'bar'); //doesn't work: $this-assertEquals( 'bar', $this->getView()->foo ); } }

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  • Filemaker - Getting field values from related table

    - by foobar
    I have the following setup in Filemaker Pro 10. Table1 with: id_table1, related_names Table2 with: id_table2, name, include and a joint-table with: id_table1, id_table2 Now I want either make related_names a calculated field or write a script that sets related_names to a comma separated list of all names which are connected through the joint-table and have Table2.include = True. So for example a data set could look like: Table1 id_table1, related_names 1, "foo,bar" 2, "foo" 3, "" joint-table id_table1, id_table2 1,1 1,2 1,3 2,1 Table2 id_table2, name, include 1, foo, True 2, bar, True 3, baz, False After searching the internet for a few hours the closest I came was a calculated field with list(join-table::id_table2) which gives me a list with a all the id_table2's. But now I would need to find the appropriate records in table2 and check the include field. I hope the problem is clear. any help is highly appreciated.

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  • Python equivalent of Java's compareTo()

    - by astay13
    I'm doing a project in Python (3.2) for which I need to compare user defined objects. I'm used to OOP in Java, where one would define a compareTo() method in the class that specifies the natural ordering of that class, as in the example below: public class Foo { int a, b; public Foo(int aa, int bb) { a = aa; b = bb; } public int compareTo(Foo that) { // return a negative number if this < that // return 0 if this == that // return a positive number if this > that if (this.a == that.a) return this.b - that.b; else return this.a - that.a; } } I'm fairly new to classes/objects in Python, so I'd like to know what is the "pythonic" way to define the natural ordering of a class?

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  • Including non-standard C headers in C++

    - by Swaroop S
    I needed to include a few c headers ( non standard header files ) in my C++ code to be compiled by gcc. The C header (foo.h) has support for : #ifdef __cplusplus extern "C" { #endif and similarly at the end for }. The c++ code has the include "foo.h" I believe I should be able to just include the header (foo.h) and create instances of structs defined in the .h file. I am not able to compile the source code. It seems like the compiler looks at the c code as if it were c++ code. I see error such as error: expected constructor, destructor or type conversion before "(" Did I do something wrong ? I took advise from : http://www.parashift.com/c++-faq-lite/mixing-c-and-cpp.html What else do i need to do, to tell the c++ compiler "expect and compile as c code" ?

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  • C# to Java: where T : new() Syntax

    - by Shiftbit
    I am porting some C# code over to Java. I am having trouble with the where Syntax, specifically new(). I understand that where is similar to Java's generic: T extends FOO. How I can replicate the new() argument in Java? "The new() Constraint lets the compiler know that any type argument supplied must have an accessible parameterless--or default-- constructor." - MSDN ie: public class BAR<T> : BAR where T : FOO, new() Right now I have: public class BAR<T extends FOO> extends ABSTRACTBAR { public HXIT(T t){ this.value = t; } .... }

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  • What does !! (double exclamation point) mean?

    - by molecules
    In the code below, from a blog post by Alias, I noticed the use of the double exclamation point !!. I was wondering what it meant and where I could go in the future to find explanations for Perl syntax like this. (Yes, I already searched for '!!' at perlsyn). package Foo; use vars qw{$DEBUG}; BEGIN { $DEBUG = 0 unless defined $DEBUG; } use constant DEBUG => !! $DEBUG; sub foo { debug('In sub foo') if DEBUG; ... } UPDATE Thanks for all of your answers. Here is something else I just found that is related The List Squash Operator x!!

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  • Sharing output streams through a JNI interface

    - by Chris Conway
    I am writing a Java application that uses a C++ library through a JNI interface. The C++ library creates objects of type Foo, which are duly passed up through JNI to Java. Suppose the library has an output function void Foo::print(std::ostream &os) and I have a Java OutputStream out. How can I invoke Foo::print from Java so that the output appears on out? Is there any way to coerce the OutputStream to a std::ostream in the JNI layer? Can I capture the output in a buffer the JNI layer and then copy it into out?

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  • How to get/create anonymous method from TRttiMethod?

    - by Heinrich Ulbricht
    I want to handle a TRttiMethod as anonymous method. How could I do this? Here is a simplified example of how I wish things to work: Interface: TMyClass = class public // this method will be acquired via Rtti procedure Foo; // this method shall return above Foo as anonymous method function GetMethodAsAnonymous: TProc; end; Implementation: function TMyClass.GetMethodAsAnonymous: TProc; var Ctx: TRttiContext; RttiType: TRttiType; RttiMethod: TRttiMethod; begin Ctx := TRttiContext.Create; try RttiType := Ctx.GetType(Self.ClassType); RttiMethod := RttiType.GetMethod('Foo'); Result := ??????; // <-- I want to put RttiMethod here - but how? finally Ctx.Free; end; end;

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  • R: How to tell lapply to ignore an error and process the next thing in the list?

    - by John
    I have an example function below that reads in a date as a string and returns it as a date object. If it reads a string that it cannot convert to a date, it returns an error. testFunction <- function (date_in) { return(as.Date(date_in)) } testFunction("2010-04-06") # this works fine testFunction("foo") # this returns an error Now, I want to use lapply and apply this function over a list of dates: dates1 = c("2010-04-06", "2010-04-07", "2010-04-08") lapply(dates1, testFunction) # this works fine But if I want to apply the function over a list when one string in the middle of two good dates returns an error, what is the best way to deal with this? dates2 = c("2010-04-06", "foo", "2010-04-08") lapply(dates2, testFunction) I presume that I want a try catch in there, but is there a way to catch the error for the "foo" string whilst asking lapply to continue and read the third date?

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  • How can I get a value from an xml key/value pair with xpath in my xslt?

    - by TahoeWolverine
    I have some xml that I want to process using xslt. A good amount of the data comes through in key value pairs (see below). I am struggling with how to extract the value base on the key into a variable. I would like to be able to do something like this: <xsl:variable name="foo" select="/root/entry[key = 'foo']/value"/> but that doesn't seem to work. Here is sample xml. <?xml version="1.0" encoding="ISO-8859-1"?> <root> <entry> <key> foo </key> <value> bar </value> </entry> </root> What would the correct xpath be for this?

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  • How can I view multiple git diffs side by side in vim

    - by Pete Hodgson
    I'd like to be able to run a command that opens up a git diff in vim, with a tab for each file in the diff set. So if for example I've changed files foo.txt and bar.txt in my working tree and I ran the command I would see vim open with two tabs. The first tab would contain a side-by-side diff between foo.txt in my working tree and foo.txt in the repository, and the second tab would contain a side-by-side diff for bar.txt. Anyone got any ideas?

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  • Pushing data once a URL is requested

    - by Eli Grey
    Given, when a user requests /foo on my server, I send the following HTTP response (not closing the connection): Content-Type: multipart/x-mixed-replace; boundary=----------------------- ----------------------- Content-Type: text/html <a href="/bar">foo</a> When the user clicks on foo (which will send 204 No Content so the view doesn't change), I want to send the following data in the initial response. ----------------------- Content-Type: text/html bar How would could I get the second request to trigger this from the initial response? I'm planning on possibly creating a fancy [engines that support multipart/x-mixed-replace (currently only Gecko)]-only email webapp that does server-push and Ajax effects without any JavaScript, just for fun.

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  • Arrays of pointers to arrays?

    - by a2h
    I'm using a library which for one certain feature involves variables like so: extern const u8 foo[]; extern const u8 bar[]; I am not allowed to rename these variables in any way. However, I like to be able to access these variables through an array (or other similar method) so that I do not need to continually hardcode new instances of these variables into my main code. My first attempt at creating an array is as follows: const u8* pl[] = { &foo, &bar }; This gave me the error cannot convert 'const u8 (*)[]' to 'const u8*' in initialization, and with help elsewhere along with some Googling, I changed my array to this: u8 (*pl)[] = { &foo, &bar }; Upon compiling I now get the error scalar object 'pl' requires one element in initializer. Does anyone have any ideas on what I'm doing wrong? Thanks.

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  • Weird generics compile error.

    - by Jouke van der Maas
    I have two classes, a base class and a child class. In the base class i define a generic virtual method: protected virtual Bar Foo<T() where T : Bar {} Then in my child class i try to do this: protected override BarChild Foo() // BarChild inherits Bar { return base.Bar<T as BarChild() } Visual studio gives this weird error: The type 'T' cannot be used as type parameter 'T' in the generic type or method 'Foo()'. There is no boxing conversion or type parameter conversion from 'T' to 'Bar'. Repeating the where clause on the child's override also gives an error: Constraints for override and explicit interface implementation methods are inherited from the base method, so they cannot be specified directly So what am i doing wrong here?

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  • Regex to strip phpdoc multiline comment

    - by Reveller
    I have this: /** * @file * API for loading and interacting with modules. * More explaination here. * * @author Reveller <me@localhost> * @version 19:05 28-12-2008 */ I'm looking for a regex to strip all but the @token data, so the result would be: @file API for loading and interacting with modules. More explaination here. @author Reveller <me@localhost> @version 19:05 28-12-2008 I now have this: $text = preg_replace('/\r?\n *\* */', ' ', $text); It does the job partially: it only removes the * in front of each line. Who could help me so it also strips /** and the final slash /? Any help would be greatly appreciated! P.S: If, for instance, the commentlbock would contain something like /** * @foo Here's some slashes for ya: / and \ */ Then obviously the slashes after @foo may not be stripped. The reult would have to be: @foo Here's some slashes for ya: / and \ I hope there's a regex guru out there :-)

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  • Generate canonical / real URL based on base.href or location

    - by blueyed
    Is there a method/function to get the canonical / transformed URL, respecting any base.href setting of the page? I can get the base URL via (in jQuery) using $("base").attr("href") and I could use string methods to parse the URL meant to being made relative to this, but $("base").attr("href") has no host, path etc attributes (like window.location has) manually putting this together is rather tedious E.g., given a base.href of "http://example.com/foo/" and a relative URL "/bar.js", the result should be: "http://example.com/bar.js" If base.href is not present, the URL should be made relative to window.location. This should handle non-existing base.href (using location as base in this case). Is there a standard method available for this already? (I'm looking for this, since jQuery.getScript fails when using a relative URL like "/foo.js" and BASE tag is being used (FF3.6 makes an OPTIONS request, and nginx cannot handle this). When using the full URL (base.href.host + "/foo.js", it works).)

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