| #ifndef BENCHMARK_ARRAYSIZE_H_ |
| #define BENCHMARK_ARRAYSIZE_H_ |
| |
| #include "internal_macros.h" |
| |
| namespace benchmark { |
| namespace internal { |
| // The arraysize(arr) macro returns the # of elements in an array arr. |
| // The expression is a compile-time constant, and therefore can be |
| // used in defining new arrays, for example. If you use arraysize on |
| // a pointer by mistake, you will get a compile-time error. |
| // |
| |
| // This template function declaration is used in defining arraysize. |
| // Note that the function doesn't need an implementation, as we only |
| // use its type. |
| template <typename T, size_t N> |
| char (&ArraySizeHelper(T (&array)[N]))[N]; |
| |
| // That gcc wants both of these prototypes seems mysterious. VC, for |
| // its part, can't decide which to use (another mystery). Matching of |
| // template overloads: the final frontier. |
| #ifndef COMPILER_MSVC |
| template <typename T, size_t N> |
| char (&ArraySizeHelper(const T (&array)[N]))[N]; |
| #endif |
| |
| #define arraysize(array) (sizeof(::benchmark::internal::ArraySizeHelper(array))) |
| |
| } // end namespace internal |
| } // end namespace benchmark |
| |
| #endif // BENCHMARK_ARRAYSIZE_H_ |
