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• nested function call faster or not ?

  - by KaluSingh Gabbar

  I have this silly argument with a friend and need a authoritative word on it. I have these two snippet and want to know which one is faster ? [A or B] (assuming that compiler does not optimize anything) [A] if ( foo () ); [B] int t = foo (); if ( t )

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• Suppressing "extra ';'" error in GCC when -pedantic is on

  - by Roman D

  Hi all, I'm building my program with -pedantic flag, which causes an extra ';' error (because of a third-party header using a few macros inconsistently; the error is not shown when -pedantic is off). I don't really feel like turning -pedantic off, and neither do I want to edit the header. Is there any way to suppress this exact error? Like a -Wno-annoying-semicolon-error compiler switch or something?

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• Factory Method and Cyclic Dependancy

  - by metdos

  If I'm not wrong, because of its nature in factory method there is cyclic dependency: Base class needs to know subclasses because it creates them, and subclasses need to know base class. Having cyclic dependency is bad programming practice, is not it? Practically I implemented a factory, I have problem above, even I added #ifndef MYCLASS_H #define MYCLASS_H #endif I'm still getting Compiler Error C2504 'class' : base class undefined And this error disappers when I remove subclass include from base class header.

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• Java: Check if a given method name exist in compile time

  - by Tom Brito

  I'm developing a frameword for handle Actions from Java Swing components; I would like to know if there is a way of checking if a given method name (that will be accessed by reflections) exists in compile time, and show a compiler error if not?

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• why can't a static member be reached through an instance name?

  - by reinier

  say I have: class Test { public static int Hello = 5; } This obviously works: int j = Test.Hello; But why should this not work? Test test = new Test(); int j = test.Hello; The instance could not have a member equally named, so I don't see how this could be ambiguous or unresolvable for a compiler. Anyone any idea why this is?

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• coding in native language

  - by radi

  is it possible to someone to invent a new programming language in his native language , and if it possible how to do that and what the tools he need to write compiler for it . thanks .

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• Translate C# code into AST?

  - by Erik Forbes

  Is it currently possible to translate C# code into an Abstract Syntax Tree? Edit: some clarification; I don't necessarily expect the compiler to generate the AST for me - a parser would be fine, although I'd like to use something "official." Lambda expressions are unfortunately not going to be sufficient given they don't allow me to use statement bodies, which is what I'm looking for.

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• How this pthread actually works?

  - by user289013

  I am actually on my project on compiler with SMP, and want to code with pthreads and heard about many parallel things open mpi and so on, So to start with how this thread is allocated to core while calling pthread,Is there any way to give threads to different cores by pthreads?

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• C++: Unknown pointer size when forward declaring (error C2036)

  - by Rosarch

  In a header file, I have forward declared two members of a namespace: namespace Foo { struct Odp typedef std::vector<Odp> ODPVEC; }; class Bar { public: Foo::ODPVEC baz; // C2036 }; The error generated by the compiler is: error C2036: 'Foo::Odp *': unknown size I'm guessing this is an issue with forward declaring Odp. How can I get around this?

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• Does string concatenation use StringBuilder internally?

  - by JamesBrownIsDead

  Three of my coworkers just told me that there's no reason to use a StringBuilder in place of concatenation using the + operator. In other words, this is fine to do with a bunch of strings: myString1 + myString2 + myString3 + myString4 + mySt... The rationale that they used was that since .NET 2, the C# compiler will build the same IL if you use the + operator as if you used a StringBuilder. This is news to me. Are they correct?

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• Are comments compiled in to C# Silverlight Applications

  - by LarryDev

  Is it safe to store information such as usernames and passwords within comments in your source code? I am not worried about some getting access to my source but I am concerned in regards to someone decompiling my compiled silverlight XAP file. Is anybody 100% sure if the compiler strips off commented code. I would assume it does but I want to be sure. Thanks!

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• What are some lesser known usages of #pragma?

  - by Xavier Ho

  I've never understood the need of #pragma once when #ifndef #define #endif always works. I've seen the usage of #pragma comment to link with other files , but setting up the compiler settings was easier with an IDE. What are some other usages of #pragma that is useful, but not widely known?

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• Cannot refer to the static enum field within an initializer ?

  - by 01

  I just got Java5 project that has this error, i tried using Java5 and Java6, but its still there. it worked somehow before(since it was in svn), how can i bypass that compiler error?

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• setting up netbeans for c

  - by leo

  i am really getting annoyed all i want to do is setup a compiler for c in netbeans - i donwloaded and followed the instructions for MiniGW, and now whenever i try to comnpile a programme it says ""Resolve missing native build tools" and the make command and debugger command fields are empty - can anyone help if not can someone tell me a good program i can just download to code in c with in windows thanks

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• Why does Go compile quickly?

  - by Evan Kroske

  I've Googled and poked around the Go website, but I can't seem to find an explanation for Go's extraordinary build times. Are they products of the language features (or lack thereof), a highly optimized compiler, or something else? I'm not trying to promote Go; I'm just curious.

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• simple IDE in C,link my program to gcc

  - by Moein Hoseini Manesh

  hi my friends, I wanna to write simple C compiler,I wrote some parts of it it can check synetic of C,now I need to link my program to gcc how can I do it? I wanna to link it,for example when user open file in my programm,gcc compile it and save it where the user want. now I don't now how to say gcc to complie this file,show error and ... [english is not my mother language,and my english is not so well,so I apologize for any mistake in my post or If I can't reached my mean]

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• Why can I set an anonymous enum equal to another in C but not C++?

  - by samoz

  I have the following code snippet: enum { one } x; enum { two } y; x = y; That will compile in C, but in C++, I get the following error: test.c:6: error: cannot convert ‘main()::<anonymous enum>’ to ‘main()::<anonymous enum>’ in assignment Can someone explain to me why this is happening? I would prefer an answer with some specifics about why the compiler behaves this way, rather than just "You can't do that"

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• Gimpel's PC-lint and Flexelint; Anyone used them?

  - by samoz

  So I've read a few magazine articles and the website for Gimpel's PC-lint and Flexelint C/C++ compiler. It's really expensive (at least for me), but it seems like it might have some merit to warrant the cost. So I'm wondering if anyone else has used/bought them and can provide their opinions?

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• Variable reference in a Groovy GString

  - by Maurits Rijk

  From the book "Groovy and Grails recipes" I'm using the following code snippet: String HelloLanguage = "def hello(language) {return \"Hello $language\"}" However, I get a compiler error "You attempted to reference a variable in the binding or an instance variable from a static context." because language can't be bound. What is wrong?

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• Elegent way to collapse or expand sub-sequences of a list in Python?

  - by forgot

  I want to collapse or expand sub-sequences of a list e.g. ['A', 'B', 'D', 'E', 'H'] -> ['AB', 'DE', 'H'] and vice versa currently I wrote some ugly code like: while True: for i, x in enumerate(s): if x == 'A' and s[i+1] == 'B': s[i:i+2] = 'AB' break else: break For people who asking 'why do that thing': Actually I'm working on a optimizing compiler and this is the peephole part. Writing pattern matching is a little annoying.

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• Compilation error with C++ templates. Is there any easy way to understand them?

  - by Naveen

  While working with the C++ templates (most of the time using STL or boost) I run into the compilation errors that are miles long. I find it hard to figure out what compiler is trying to tell me. Is there any quick reference guide or a tool which can convert this error into something more understandable to humans?

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• Is possible to generate constant value during compilation?

  - by AOI Karasu

  I would like my classes to be identified each type by an unique hash code. But I don't want these hashed to be generated every time a method, eg. int GetHashCode(), is invoked during runtime. I'd like to use already generated constants and I was hoping there is a way to make the compiler do some come computing and set these constants. Can it be done using templates? Could you give me some example, if it is possible.

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• Why compile + link when build a C++ code, instead of generating executable directly

  - by Dbger

  I was asked of this question when mentor an entry-level programmer, I was thinking of this compile + link process so official and usual that I never think about why. One thing I could think of is to improve the development productivity, but should there be any other more compiler-related reasons?

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• which RDBMS or other tool provides good SQL syntax error messages?

  - by zzz

  I use MySQL and it gives no meaningful error messages beyond "syntax wrong close to something or other". This is in sharp contrast to the sort of nice, clear error messages we are used to getting from java compiler and similar. So, are there RDBMS or sql validation tools that provide clearer, meaningful error messages?

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• What does S-attributed and L-attributed grammar mean?

  - by user203123

  I'm reading a compiler book and kinda confused when it says "a S-attribute grammar is also a L-attribute grammar". Couldn't understand. Can someone make it clear (an example should be great). Thanks.

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