bool to str benchmark

bool2str.cpp

#include <assert.h>
#include <chrono>
#include <iostream>
#include <sstream>

using namespace std::chrono;
constexpr auto SAMPLES = 100'000u;

auto curr_time()
{
    return high_resolution_clock::now();
}

int main()
{
    {
        uint64_t sum = 0;
        for (auto j = 0u; j < SAMPLES; ++j) {
            std::stringstream ss;
            bool r = rand() & 1;
            ss << std::boolalpha;
            auto start = curr_time();
            ss << r;
            auto end = curr_time();
            sum += duration_cast<nanoseconds>(end - start).count();
        }
        std::cout << "Stream took " << sum / SAMPLES << "ns (" << SAMPLES << " samples)\n";
    }

    {
        uint64_t sum = 0;
        for (auto j = 0u; j < SAMPLES; ++j) {
            bool r = rand() & 1;
            auto start = curr_time();
            snprintf(nullptr, 0, "%s", r ? "true" : "false");
            auto end = curr_time();
            sum += duration_cast<nanoseconds>(end - start).count();
        }
        std::cout << "Ternary took " << sum / SAMPLES << "ns (" << SAMPLES << " samples)\n";
    }

    {
        uint64_t sum = 0;
        for (auto j = 0u; j < SAMPLES; ++j) {
            bool r = rand() & 1;
            auto start = curr_time();
            snprintf(nullptr, 0, "%s", "false\0true" + (+r * 6));
            auto end = curr_time();
            sum += duration_cast<nanoseconds>(end - start).count();
        }
        std::cout << "Offset took " << sum / SAMPLES << "ns (" << SAMPLES << " samples)\n";
    }

    return 0;
}