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Daniel Briceño
Asked: 2022-03-21 17:25:12 +0800 CST 2022-03-21 17:25:12 +0800 CST

How to identify the language type: C or C++ using a preprocessor?

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As the title says:

How to identify the language type: C or C++ using a preprocessor?

I am making a resource file. Call ids.hthat I plan to use in programs for both C and C++. The idea is that if it's C a structure is compiled, but if it's C++ a class is compiled:

#ifdef _C_
typedef struct{/***@param Code*/}Cadena;
#elif _CPP_
class Cadena{
/**@param Code*/
};

#endif

The objective is to identify the language so that errors do not occur when executing it.

c++

1 Answers

  1. Best Answer

    If you're compiling to , the macro __cpluspluswill be defined, containing the compiler's supported C++ standard number:

    • 199711Lbefore C++11.
    • 201103LC++11.
    • 201402LC++14.
    • 201703LC++17.
    • 202002LC++20.

    This not only lets you know if you're compiling to C++, it also allows you to make decisions based on the standard used.

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