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Editorial Team
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Asked: 2026-05-14T20:45:59+00:00

Where to check if type long long is defined? I wanna do something like

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Where to check if type long long is defined? I wanna do something like this:

#ifdef LONGLONG
#define long_long long long
#else 
#define long_long long
#endif
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1 Answer

  1. Editorial Team

    LLONG_MAX gives the maximum value representable by a long long; if your implementation doesn’t support long long, it shouldn’t define LLONG_MAX.

    #include <limits.h>

#ifdef LLONG_MAX
#define long_long long long
#else
#define long_long long
#endif

    This isn’t a perfect solution. long long isn’t standard in C++03, and long long has been around longer than C99, so it’s possible (and likely) that a compiler could support long long but not define LLONG_MAX.

    If you want an integer type with a specific size, you should use <stdint.h> if your implementation supports it. If your implementation doesn’t support it, Boost has an implementation of it.

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