Benchmark std::format vs fmt::format

bench_fmt.cpp

// Copyright (c) 2018-2022 iFarbod and other contributors. All Rights Reserved.
//
// SPDX-License-Identifier: MIT

#include <format>

#include <vendor/benchmark/include/benchmark/benchmark.h>
#define FMT_USE_FULL_CACHE_DRAGONBOX 1
#include <vendor/fmt/include/fmt/format.h>

void fmt_format_runtime(benchmark::State& state)
{
    for (auto _ : state)
    {
        std::string s{fmt::format("{}", 1'000'000)};
        benchmark::DoNotOptimize(s);
    }
}
BENCHMARK(fmt_format_runtime);

void std_format_runtime(benchmark::State& state)
{
    for (auto _ : state)
    {
        std::string s{std::format("{}", 1'000'000)};
        benchmark::DoNotOptimize(s);
    }
}
BENCHMARK(std_format_runtime);

BENCHMARK_MAIN();