Thread: Splitting up a C++ Program?

  1. 09-22-2010 #1
    jeffc1
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    Splitting up a C++ Program?

    Please forgive me if this topic is redundant. I've searched and couldnt find anything.

    I'm a bit confused here as i'm trying to split my cpp program into 3 separate files using Visual Studio.

    main.cpp includes interface.h
    interface.h include implementation.cpp
    implementation.cpp includes interface.h

    I get an error message too many include files : depth = 1024 1> Generating Code...

    on #include "interface.h" within implementation.cpp.

    Please tell me what i'm doing wrong?

    I also went into the solution explorer and tried manually adding the .h file under "headers" and .cpp files under" source files". nothing is working.
  2. 09-22-2010 #2
    Elysia
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    This is obvious. Look carefully:

    main.cpp includes interface.h
    interface.h include implementation.cpp
    implementation.cpp includes interface.h

    So interface.h includes implementation.cpp, and implementation.cpp includes interface.h, and interface.h includes implementation.cpp, and implementation.cpp includes interface.h... wait, haven't we already seen this before?
    Yes we have! They include each other!

    Anyhow, you should never include .cpp files. Add them to your project only. .h files you should include.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.
  3. 09-22-2010 #3
    jeffc1
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    Thanks!
    If I exclude the line, and the CPP to my project as a "source file"
    all of the functions inside of implementation.cpp are not found.
    Im probably doing something wrong there. What would be the proper way to include the implementation.cpp file in Visual Studio?
  4. 09-22-2010 #4
    Elysia
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    You should make function declarations aka prototypes of all your functions, and put those in a header file. Then you include the header file in the files that needs to call those functions.
    It will work beautifully you'll see.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.
  5. 09-22-2010 #5
    Salem
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    There's a FAQ entry on multi-file programs.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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