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Thread: naming conventions underscore

  1. Nov 4th, 2002, 06:22 AM #1
    FantastichenEin
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    naming conventions underscore

    what is an underscore before a function name used to signify.
    e.g. _toupper()

    also what does it mean when a function name is preceded by 2 underscores.
    __functionName()

    thanks
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  2. Nov 4th, 2002, 06:49 AM #2
    parksie
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    Having a _ prepended is reserved for internals to the Standard Library, I think. More than one is reserved for compiler vendors (I think MS use three in some cases ).

    Basically, you're not supposed to use them in your code.

    However, in C, all functions have a _ prepended internally (which is why if you don't get your linker settings right, you may get errors about _main()).
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  3. Nov 4th, 2002, 01:04 PM #3
    CornedBee
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    One underscore is for library internals or for compiler-specific extensions (like _itoa). gcc does not heed this because of POSIX requirements and similar things.

    __ is usually for compiler-specific keywords (like __gc, __int64, __declspec etc.). I actually don't know any functions that start with __
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