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| benchmark.cpp #include <benchmark/benchmark.h> #include <array>
constexpr int len = 6;
// constexpr function具有inline属性,你应该把它放在头文件中 constexpr auto my_pow(const int i) { return i * i; }
static void bench_array_operator(benchmark::State& state) { std::array<int, len> arr; constexpr int i = 1; for (auto _: state) { arr[0] = my_pow(i); arr[1] = my_pow(i+1); arr[2] = my_pow(i+2); arr[3] = my_pow(i+3); arr[4] = my_pow(i+4); arr[5] = my_pow(i+5); } } BENCHMARK(bench_array_operator);
static void bench_array_get(benchmark::State& state) { std::array<int, len> arr; constexpr int i = 1; for (auto _: state) { std::get<0>(arr) = my_pow(i); std::get<1>(arr) = my_pow(i+1); std::get<2>(arr) = my_pow(i+2); std::get<3>(arr) = my_pow(i+3); std::get<4>(arr) = my_pow(i+4); std::get<5>(arr) = my_pow(i+5); } } BENCHMARK(bench_array_get);
BENCHMARK_MAIN();
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