| 1 | #ifndef BENCHMARK_ARRAYSIZE_H_ |
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| 2 | #define BENCHMARK_ARRAYSIZE_H_ |
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| 3 | |
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| 4 | #include "internal_macros.h" |
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| 5 | |
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| 6 | namespace benchmark { |
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| 7 | namespace internal { |
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| 8 | // The arraysize(arr) macro returns the # of elements in an array arr. |
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| 9 | // The expression is a compile-time constant, and therefore can be |
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| 10 | // used in defining new arrays, for example. If you use arraysize on |
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| 11 | // a pointer by mistake, you will get a compile-time error. |
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| 12 | // |
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| 13 | |
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| 14 | // This template function declaration is used in defining arraysize. |
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| 15 | // Note that the function doesn't need an implementation, as we only |
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| 16 | // use its type. |
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| 17 | template <typename T, size_t N> |
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| 18 | char (&ArraySizeHelper(T (&array)[N]))[N]; |
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| 19 | |
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| 20 | // That gcc wants both of these prototypes seems mysterious. VC, for |
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| 21 | // its part, can't decide which to use (another mystery). Matching of |
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| 22 | // template overloads: the final frontier. |
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| 23 | #ifndef COMPILER_MSVC |
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| 24 | template <typename T, size_t N> |
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| 25 | char (&ArraySizeHelper(const T (&array)[N]))[N]; |
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| 26 | #endif |
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| 27 | |
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| 28 | #define arraysize(array) (sizeof(::benchmark::internal::ArraySizeHelper(array))) |
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| 29 | |
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| 30 | } // end namespace internal |
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| 31 | } // end namespace benchmark |
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| 32 | |
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| 33 | #endif // BENCHMARK_ARRAYSIZE_H_ |
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| 34 | |
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