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    Macro __cplusplusMacro __cplusplusMacro __cplusplus

    Use Case: Check Compiler Setting Check Compiler Setting

    #ifndef __cplusplus
  #error C++ is required
#elif __cplusplus > 199711L
  // C++11 (or newer) code goes here
#else
  // old-school code goes here
#endif

    Standard Values

    C++98 #define __cplusplus   199711L
    C++03 #define __cplusplus   199711L
    C++11 #define __cplusplus   201103L
    C++14 #define __cplusplus   201402L
    C++17 #define __cplusplus   201703L
    C++20 #define __cplusplus   202002L

    Older Compilers

    If a compiler was released between C++ standards, values for __cplusplus might differ from the ones in the above table. However, you can always rely on the fact that the value of __cplusplus for a newer standard will be strictly larger than that of the previous standard.