custom include files

This is a discussion on custom include files within the C++ Programming forums, part of the General Programming Boards category; Why do you need to make your own include files and what do you put in them? Thanks -Chris...

  1. #1
    Refugee face_master's Avatar
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    custom include files

    Why do you need to make your own include files and what do you put in them?

    Thanks
    -Chris

  2. #2
    It's full of stars adrianxw's Avatar
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    >>> Why do you need to make your own include files

    You don't need to make your own include files at all. It is perfectly possible to create very large programs without. It is simply that most people, and almost all professionals do not choose to do it that way.

    As your programmes get more complicated, (and larger), you will find you want to break your program up into several smaller files, not least for the fact that it compiles faster. If you change one line in a 100000 line program file, it will compile 100000 lines. If you've broken that up into 1000 line files, only one gets done. This is one reason for custom includes. Rather than re- prototyping and extern'ing your variables in each of your smaller files, your create an include with this stuff in it and #include it.

    Once you get a bit more sophisticated, you'll want to start creating libraries and .DLL's. For the same reason, you'll create custom includes for each.

    As with everything, there are other reasons as well, but think about these for now.
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  3. #3
    Refugee face_master's Avatar
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    As I understand it, you write all your functions (and the function's code) into header files, then include those header files into the source file which has the main() function (then the code in the main function). Is this all correct...?

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    A very simple header file might look like this:
    Call it: square.h
    Code:
    #ifndef GUARD_square_h
    #define GUARD_square_h
    
    //Function Prototype
    int Square(int);
    
    #endif
    Its souce file might look this way:
    Call it: square.cpp
    Code:
    #include "StdAfx.h"
    
    int Square(int x)
    {
       return x*x;
    }
    The simple implimentation program would look like this:
    Call it: myprogram.cpp
    Code:
    #include "StdAfx.h"
    #include "square.h"
    #include<iostream>
    using namespace std;
    
    int main()
    {
       cout << Square(10);
       return 0;
    }
    I compile code with:
    Visual Studio.NET beta2

  5. #5
    It's full of stars adrianxw's Avatar
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    >>> Is this all correct...?

    No. Dean's example is correct. The functions are prototyped in the header, and implemented in other .cpp files.
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  6. #6
    Has a Masters in B.S.
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    actually dean forgot to include square.h in square.cpp where as i understand this might be done in stdafx.h this may not be clear.

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    square.cpp doesn't need square.h.
    I compile code with:
    Visual Studio.NET beta2

  8. #8
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    actually no but in other cases when its expanded it may. habit forming ya know.
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  9. #9
    Registered User minime6696's Avatar
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    Cool it can also **** you up....

    When including a header file, you need to judge weather its really needed such as soemthing that has an external class or a class prototype in it, that would be re-defined, he need to understand WHY he' doing it.

    SPH

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