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• LINQ: How do I concatenate a list of integers into comma delimited string?

  - by Haoest

  It's probably something silly I missed, but I try to concatenate a list of integers instead of summing them with: integerArray.Aggregate((accumulator, piece) => accumulator+"," + piece) The compiler complained about argument error. Is there a slick way to do this without having to go through a loop?

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• Do you know of some performances test of the different ways to get thread local storage in C++?

  - by Vicente Botet Escriba

  I'm doing a library that makes extensive use of a thread local variable. Can you point to some benchmarks that test the performances of the different ways to get thread local variables in C++: C++0x thread_local variables compiler extension (Gcc __thread, ...) boost::threads_specific_ptr pthread Windows ... Does C++0x thread_local performs much better on the compilers providing it?

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• Scala Unit type

  - by portoalet

  I use opencsv to parse csv files, and my code is while( (line = reader.readNext()) != null ) { .... } I got a compiler warning saying: comparing values of types Unit and Null using `!=' will always yield true [warn] while( (aLine = reader.readNext()) != null ) { How should I do the while loop?

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• Constructor for an immutable struct

  - by Danvil

  Consider the following simple immutable struct: struct Stash { public int X { get; private set; } public Stash(int _x) { X = _x; } } This is not working, because the compiler wants me to initialize the "backing field" before I can access the property. How can I solve this?

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• How can I know when QProcess wants to read input?

  - by mpcabd

  I'm implementing a compiler in my Compilers class, I'm using Qt & C++. After I have generated the machine code from the source code, I'm executing the virtual machine that will execute the call. I'm facing a problem here, I'm using readyRead() signal to get output from the virtual machine, but how can I know that the virtual machine wants to read data from the user? I wanna show the user an input dialog each time the machine asks for input.

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• recursive typedef

  - by FredOverflow

  Is the following allowed? typedef Foo<Bar> Bar; My compiler complains that 'class Bar' has a previous declaration as 'class Bar'.

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• Are tr1 headers available for gcc v3.4.6?

  - by WilliamKF

  Are tr1 headers available for g++ v3.4.6? If so, how can I locate them at compile time. The following is failing to compile: #include <tr1/memory> With the following error: myModule.h:20:24: tr1/memory: No such file or directory Do I need to move to a later compiler or do I have the headers somewhere?

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• I want to know the behaviour of break statement in C. Does it work only for ';for-while-do-switch' o

  - by avanish

  Suppose, I have a 'if statement' inside a 'for-loop'. for( ; ; ) { ------- if( ) { printf(" inside if"); break; }//if printf("inside for"); }//for now, will the 'break-statement' cause the compiler to come out of the 'for-loop' or will it only come out of the if loop on the 'if-condition' being satisfied.

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• is const (c++) optional?

  - by Dr Deo

  according to some tutorials i read a while back, the "const" declaration makes a variable "constant" ie it cannot change later. But i find this const declaration abit inconveniencing since the compiler sometimes gives errors like "cannot convert const int to int" or something like that. and i find myself cheating by removing it anyway. question: assuming that i am careful about not changing a variable in my source code, can i happily forget about this const stuff? Thanks in advance

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• What is DEFAULT_CC in function declaration?

  - by humoeba

  I'm relatively new to C, and am curious what this syntax means in a function declaration: int DEFAULT_CC foo(void) where DEFAULT_CC is probably defined somewhere else as: #define DEFAULT_CC "cc" Is this a direction to use a certain compiler or something?

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• How to connect to a database from VC++/CLI .NET 4.0

  - by abatishchev

  How to connect to a database (any natively supported by .NET) - SQL Server 2008 or Access - from a Windows Forms application written on VC++/CLI (compiler ver. 16.0 from .NET 4.0)

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• how do i avoid this linking error ?

  - by Yogesh

  if i have defined a global variable(with initialization) in header file, and included this file in two file and try to compile and link, compiler gives linking error ----------------- >>headers.h #ifndef __HEADERS #define __HEADERS int x = 10; #endif >>1.c #include "headers.h" main () { } --------------------- >>2.c #include "headers.h" fun () {}

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• .NET coupled with MATLAB or R?

  - by Peter

  I'm writing a program in .NET that will need to utilize the statistical and data analysis functions of R or MATLAB. I have used R but am now contemplating moving to MATLAB since it has a .Net compiler while R can only interface via COM objects. Can anyone recommend going either way? I know MATLAB is infinitely more expensive than R (since R is free) but I'm thinking that may translate to an easier development cycle?

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• AIX- Does not install shared lib

  - by kadeshpa

  I am able to build the shared object successfully using the holy native compiler "xlc" on AIX.It does build the shared object library but does not install the shared object library. Configure command is: ./configure --prefix=/PATH/to/install --exec-prefix=/PATH/to/install --enable-shared --enable-static=no --enable-module=so --build=powerpc-ibm-aix5.3.0.0 --host=powerpc-ibm-aix5.3.0.0 LDFLAGS="-G -shared" Any help would be appreciated?

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• [game] How is it possible to legally write ::: in C++ and ??? in C#?

  - by daveny

  These questions are a kind of game, and I did not find the solution for them. It is possible to write ::: in C++ without using quotes or anything like this and the compiler will accept it (macros are prohibited too). And the same is true for C# too, but in C#, you have to write ???. I think C++ will use the :: scope operator and C# will use ? : , but I do not know the answers to them. Any idea?

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• Destructors in C++

  - by user265260

  does the Destructor deallocate memory assigned to the object which it belongs to or is it just called so that it can perform some last minute housekeeping before the object os deallocated by the compiler?

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• How can I close a JFrame by click on a button?

  - by Roman

  I would like to have a button in my window such that if I click it (button) the window is closed. I found out that I can close a window in the following way: referenceToTheFrame.hide(); //hides the frame from view refToTheFrame.dispose(); //disposes the frame from memory But if I do this way, compiler complains: Note: myProgram.java uses or overrides a deprecated API Note: Recompile with -Xlint:deprication for details. Do I do something unsafe?

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• how const keyword works in c

  - by mousey

  Hi, I want to know about const internals in c and c++ . How compiler imposes constantness ? Can some one help me please.

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• binary operator "<"

  - by md004

  Consider this expression as a "selection" control structure on integer "x": 0 < x < 10, with the intention that the structure returns TRUE if "x" is in the range 1..9. Explain why a compiler should not accept this expression. (In particular, what are the issues regarding the binary operator "<"? Explain how a prefix operator could be introduced so the expression can be successfully processed.

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• Are 'const' variables precomputed by default in C++?

  - by Gunnar

  Suppose I have variables for positions like const float latitude = 51.+11./60.+33.0461/3600.; const float longitude = 12.+50./60.+31.9369/3600.; and use them frequently in the program. Does the compiler precompute that? (This example should not produce much overhead, but you get the point.) Bonus point for pointing out location. ;) TIA

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• Why do we need break after case statements?

  - by kunjaan

  Why doesn't the compiler automatically put break statements after each code block in the switch? Is it for historical reasons? When would you want multiple code blocks to execute?

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• How to see list of html-tidy errors in VIM for Windows?

  - by stumbling

  I am using Vim 7.2 on WinXP. I've tired to run tidy like this: :compiler tidy :make :copen When I do :copen it shows me no errors to jump to. I've seen references that shellpipe might need to be set a specific way, but that refers to an earlier version of VIM. How should I be using HTML-tidy with VIM, and do I need to mess with shellpipe to get it to work with WinXP?

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• Is this a correct syntax (c code found on wikipedia)?

  - by m4design

  I just found this code on wikipedia. Link: http://en.wikipedia.org/wiki/Sizeof#Use The code: /* the following code illustrates the use of sizeof * with variables and expressions (no parentheses needed), * and with type names (parentheses needed) */ char c; printf("%zu,%zu", sizeof c, sizeof(int)); It states that: "The z prefix should be used to print it, because the actual size can differ on each architecture." I tried it on my compiler, but it gives the following result: 'zu,zu'

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• sizeof float (3.0) vs (3.0f)

  - by kumar

  Hi, What is the difference between sizeof(3.0) and sizeof(3.0f) I was expecting both of them to give the same result (sizeof float)..but its different. In 32 bit machine,gcc compiler, sizeof(3.0f) =4 sizeof(3.0) = 8 Why so?

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• Is C++ CLI a superset of C++?

  - by Brian R. Bondy

  Would a C++ CLI compiler be able to compile some large sets of C++ classes without modifications? Is C++ CLI a superset of C++?

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