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