Check if is declared

This is a discussion on Check if is declared within the C++ Programming forums, part of the General Programming Boards category; Is there a function to check if a function or variable is declared?...

  1. #1
    Reverse Engineer maxorator's Avatar
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    Check if is declared

    Is there a function to check if a function or variable is declared?

  2. #2
    Registered User major_small's Avatar
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    not really... what's your situation?
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  3. #3
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    Quote Originally Posted by major_small
    not really... what's your situation?

    i have a strange feeling it's a circular include
    i seem to have GCC 3.3.4
    But how do i start it?
    I dont have a menu for it or anything.

  4. #4
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    Quote Originally Posted by misplaced
    i have a strange feeling it's a circular include

    what is a circular include, ive never heard of it before?

  5. #5
    Registered User major_small's Avatar
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    oversimplified:

    file1:
    Code:
    #include "file1"
    file2:
    Code:
    #include "file2"
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  6. #6
    and the hat of wrongness Salem's Avatar
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    > Is there a function to check if a function or variable is declared?
    Yeah, it's called a compiler.
    If it isn't declared, it prints a message.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  7. #7
    Registered User major_small's Avatar
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    Quote Originally Posted by Salem
    > Is there a function to check if a function or variable is declared?
    Yeah, it's called a compiler.
    If it isn't declared, it prints a message.
    you took the easy answer
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  8. #8
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    Quote Originally Posted by major_small
    oversimplified:

    file1:
    Code:
    #include "file1"
    file2:
    Code:
    #include "file2"
    What you gave is two examples of self-inclusion. I assume what you meant was;

    file1:
    Code:
    #include "file2"
    file2:
    Code:
    #include "file1"

  9. #9
    Dae
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    I'll take a wild guess at his situation.

    To make sure its not included more than once when compiling, add this at beginning of .h file: #ifndef FILENAMEHERE_H_, and #define FILENAMEHERE_H_, and then #endif at the end of the .h file.
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  10. #10
    Registered User major_small's Avatar
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    Quote Originally Posted by grumpy
    What you gave is two examples of self-inclusion. I assume what you meant was;

    file1:
    Code:
    #include "file2"
    file2:
    Code:
    #include "file1"
    yeah, that's what I meant... sorry about any confusion I caused
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  11. #11
    aoeuhtns
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    It might be a double-include.

    file1:
    Code:
    #include "file3"
    file2:
    Code:
    #include "file3"
    file4:
    Code:
    #include "file1"
    #include "file2"

  12. #12
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    To answer your question. C++ requires a build environment of some sort in order to build an application. This is included in part of the Critique of C++ (http://ortdotlove.net/docs/ACritiqueOfC++.pdf). This is why we have things like autotools who's job is to determine if functions exist and if they confrom to a particular implementation. I'd suggest starting by learning Scons. It is an easy to use and learn build environment. And then if you care you can learn autotools which is quite painful and most likely going to give you braindamage. Both work under *NIX and Win32 (win32 requires something like cygwin).

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