Benchmark 是 Google 一个用来对代码片段进行基准测试的库，类似单元测试，例如：
#include <benchmark/benchmark.h>
static void BM_SomeFunction(benchmark::State& state) {
// Perform setup here
for (auto _ : state) {
// This code gets timed
SomeFunction();
}
}
// Register the function as a benchmark
BENCHMARK(BM_SomeFunction);
// Run the benchmark
BENCHMARK_MAIN();
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