google benchmark c++ example

goole-benchmark-test01.cpp

#include <iostream>
#include <sstream>
#include <benchmark/benchmark.h>

using namespace std;

static void BM_bench01(benchmark::State& st) {
    while (st.KeepRunning()) {
        std::stringstream s;
        for (size_t i = 0; i < st.range(0); i++) {
            s << "nemam cas " << i << '\n';
        }
        auto str = s.str();
    }
}

static void BM_bench02(benchmark::State& st) {
    while (st.KeepRunning()) {
        std::stringstream s;
        for (size_t i = 0; i < st.range(0); i++) {
            s << "nemam cas " << i << std::endl;
        }
        auto str = s.str();
    }
}

static void BM_bench03(benchmark::State& st) {
    while (st.KeepRunning()) {
        std::string s;
        for (size_t i = 0; i < st.range(0); i++) {
            s += "nemam cas " + std::to_string(i) + "\n";
        }
    }
}

BENCHMARK(BM_bench01)->RangeMultiplier(2)->Range(8, 8<<10);;
BENCHMARK(BM_bench02)->RangeMultiplier(2)->Range(8, 8<<10);;
BENCHMARK(BM_bench03)->RangeMultiplier(2)->Range(8, 8<<10);;

BENCHMARK_MAIN();