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• Virtual functions and templates in C++ - can they be replaced with other (existing in C++) opertaion

  - by Narek

  For example concept of Templates in C++ are for comfort as compiler generates some additional code, for your class or for your function, isn't it? So we could live without template by doing some additional (manual work). What about virtual functions??? Are there any situations where both of them are irreplaceable?

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• Why doesn't web browsers have built in validators?

  - by August Karlstrom

  As far as I know there is no web browser with built in validators for HTML, CSS and Javascript. Developing web pages without validation is like using a compiler that doesn't do syntax analysis. Even Firefox with its excellent plugins aimed at developers like Firebug lacks plugins for CSS and Javascript validation. Wouldn't it be useful to have these plugins? Am I missing something?

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• Inline functions in C++

  - by user265260

  If we define a member function inside the class definition itself, is it necessarily treated inline or is it just a request to the compiler which it can ignore.

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• Problem with C function of type char pointer, can someone explain?

  - by JJ

  Find the errors from following C function : char* f(int i) { int i; char buffer[20]; switch ( i ) { 1: strcpy( buffer, "string1"); 2: strcpy( buffer, "string2"); 3: strcpy( buffer, "string3"); default: strcpy(buffer, "defaultstring"); } return buffer; } this is c funtion not C++, I think it has to do with type conversion my compiler give warning that declaration of int i shadows a parameter.

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• how measure complexity of program

  - by gcc

  how does compiler determine there is run-time error ? is it run the code and then decide whether code executable or not are there any program which are capable to determine complexity of my executable code? are there any code which is for measuring the time when code start to execute up to finish

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• Deriving a class from an abstract class (C++)

  - by cemregoksu

  I have an abstract class with a pure virtual function f() and i want to create a class inherited from that class, and also override function f(). I seperated the header file and the cpp file. I declared the function f(int) in the header file and the definition is in the cpp file. However, the compiler says the derived class is still abstract. How can i fix it?

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• C struct memory layout?

  - by Eonil

  I have C# background. Very newbie to low level language like C. In C#, memory layout by compiler by default, and I have to specify some special attribute to override this behavior for exact layout. As I know, C does not re-align by default. But I heard there's a little re-aligning behavior which very hard to find. Can I know about C's memory layout behavior? (what should be re-aligned and not)

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• Control is set to false, jQuery selector fails

  - by Damien Joe

  Hi I have some controls on an asp.net modal which I show manually via code behind. Now I am trying to attach a selector on one of the controls inside pageLoad(), problem being is that the modal container is initially set to visible=false. I tried checking for length but it still throws exception if ($('#<%= myControl.ClientId %>').length > 0) { $('#<%= myControl.ClientID %>').click(function() { // Do work }); } Compiler Error Message: CS0103: The name 'myControl' does not exist in the current context

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• How should a progmode insert the appropriate strings into compilation-error-regexp-alist ?

  - by Cheeso

  I want to modify csharp-mode.el so that it includes the appropriate error regex's (regexi?) for the .NET csc.exe compiler. How should a well-behaved progmode do this?

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• Is there a C# equivalent of typeof for properties/methods/members?

  - by David

  A classes Type metadata can be obtained in several ways. Two of them are: var typeInfo = Type.GetType("MyClass") and var typeInfo = typeof(MyClass) The advantage of the second way is that typos will be caught by the compiler, and the IDE can understand what I'm talking about (allowing features like refactoring to work without silently breaking the code) Does there exist an equivalent way of strongly referencing members/properties/methods for metadata and reflection? Can I replace: var propertyInfo = typeof(MyClass).GetProperty("MyProperty") with something like: var propertyInfo = property(MyClass.MyProperty)

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• What does an object file contain

  - by benjamin button

  HI everyone, during the various stages of compilation in C or C++, i know that an object file gets generated. i.e., any_name.o file. what does thos .o file contain actually. i cant open it since its a binary file. Could anybody please help me? are the contents of the object file mainly Dependant on the compiler which we use on unix?

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• [Visual C++]Forcing memory alignment of variables/data-structures

  - by John

  I'm looking at using SSE and I gather aligning data on 16byte boundaries is recommended. There are two cases to consider: float data[4]; struct myystruct { float x,y,z,w; }; I'm not sure the first case can be done explicitly, though there's perhaps a compiler option I could use? In the second case I remember being able to control packing in old versions of GCC several years back, is this still possible?

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• Undefined reference to `xlCreateBookCA' C++

  - by Jake88

  Hey, I'm trying to use the Libxl library in my eclipse c/c++ project. Right now I'm using the minGW compiler in eclipse. With this following code: Book* book = xlCreateBook(); I get this error: /src/xls2csv.cpp:22: undefined reference to `xlCreateBookCA' Any help would be greatly appreciated :)

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• c# 3.5 class List<int> class initialisation

  - by josephj1989

  I can initialize a List like new List{1,2,3,4,5}; However List does not have a constructor which accepts a single parameter. So I tried to run this through the debugger and it seems to be calling the Add method. So how does the compiler know which method to invoke to add each individual element. This may be a silly question but I am a bit confused. Thanks

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• What does "Contract can't be in try block" mean?

  - by MatthewMartin

  I'm using the 3.5 library for microsoft code contracts public object RetrieveById(int Id) { Contract.Ensures(newObject != null, "object must not be null"); return newProject; //No error message if I move the Contract.Ensures to here //But it isn't asserting/throwing a contract exception here either } I get the compiler message: "Error 18 Contract section within try block in method 'Controller.RetrieveById(System.Int32)'

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• error prepareForSegue between a viewController and a tableViewController

  - by beta

  -(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { if ([segue.identifier isEqualToString:@"My_TableView"]) { MyTableViewController *destViewController = segue.destinationViewController; destViewController.data = data; } } Hi, I have a problem doing a segue (modal) between a ViewController to a TableViewController. The name of the segue between the ViewController and the NavigationController is "My_TableView". Compiler gives me this error: unrecognized selector sent to instance 0x9275b50 what's the problem?

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• Class definition thinks setting a variable is a Unit?

  - by DeLongey

  Writing out a Scala class and problem here is that the compiler thinks that the code is a unit not returning the proper value. It's a method used to set a property in the class: def setObject(`object`:StripeObject):StripeObject = { this.`object` = `object` } The error is: type mismatch; found : Unit required: com.stripe.StripeObject The full class is: case class EventData(var previousAttributes: HashMap[String,Object], var `object`:StripeObject) extends StripeObject { def getPreviousAttributes = { previousAttributes } def setPreviousAttributes(previousAttributes: HashMap[String, Object]) = { this.previousAttributes = previousAttributes } def getObject = { `object` } def setObject(`object`:StripeObject):StripeObject = { this.`object` = `object` } } How do I make sure it doesn't return a Unit?

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• F# compilation error: Unexpected type application

  - by Jim Burger

  In F#, given the following class: type Foo() = member this.Bar<'t> (arg0:string) = ignore() Why does the following compile: let f = new Foo() f.Bar<Int32> "string" While the following won't compile: let f = new Foo() "string" |> f.Bar<Int32> //The compiler returns the error: "Unexpected type application"

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• Switching 2003 SRV to 2008 caused Asp.net application not to load DLL

  - by Tom

  Switching aged 2003 SRV to 2008 caused my Asp.net 2 application fail: The application is no more loading the required library DLL from /bin/ folder anymore. What should I change in my code or web.config to make this webapp load OK also in new 2008 server? Now I receive this error when I access the application: This type is in IMPORTS ( Dll ). Compiler Error Message: BC30002: Type 'Facebook.Entity.User' is not defined.

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• Where can I download an SBT 0.13 snapshot package?

  - by Ivan

  Being stuck with a scala 2.9 compiler bug I've decided to try moving to Scala 2.10 RC. As a part of the switch I was trying to install SBT 0.13 snapshot. The official web page lists a broken link: http://scalasbt.artifactoryonline.com/scalasbt/sbt-native-packages/org/scala-sbt/sbt//0.13.0-SNAPSHOT/sbt.tgz There is nothing about 0.13 in the directory, the link gives Error 404. Any ideas about where to get the file?

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• Timer to find elapsed time in a function call in C

  - by Mohit Nanda

  I want to calculate time elapsed during a function call in C, to the precision of 1 nanosecond. Is there a timer function available in C to do it? If yes please provide a sample code-snippet. Pseudo code Timer.Start() foo(); Timer.Stop() Display time elapsed in execution of foo() Environment details: - using gcc 3.4 compiler on a RHEL machine

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• static thread function access non-static class member in C++

  - by user397390

  Class Test{ int value; static void* thread_func(void* args){ value++; } void newthread(){ pthread_create(&thread_func,...); } } I'm trying to create a thread in Class Test. Therefore compiler forces me to make thread_func static. However I cannot access the non-static member "value" anymore. It says: invalid use of member 'Class::value' in static member function Is there a way around it?

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• C++ Pointer to a function which takes an instance of a templated class as argument

  - by Nils

  I have trouble compiling a class, which has function pointers as member variables. The pointers are to functions which take an instance of a class as argument. Like template<class T, int N> double (*f)(Vector<T,N> v); I get "error: data member 'f' cannot be a member template" Compiler is gcc 4.2.

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• Reading a large text file to memory in C++

  - by NoneType

  Is there a way to read a large text file (~60MB) into memory at once (like a compiler flag to increase program memory limit) ? Currently, ofstream's open function throws a segmentation fault while trying to read this file. ifstream fis; fis.open("my_large_file.txt"); // Segfaults here The file just consists of rows of the form number_1<tabspace>number_2 i.e., two numbers separated by a tabspace.

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• What is the undecidable problems in programming ?

  - by dani3lcara

  Now I know that what can be computed or what cannot be computed? So let me know about the undecidable problems in programming and compiler.How can we proof knowing something is impossible?

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