File: stringstream.bench.cpp

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#include "benchmark/benchmark.h"
#include "test_macros.h"

#include <sstream>

TEST_NOINLINE double istream_numbers();

double istream_numbers() {
  const char* a[] = {"-6  69 -71  2.4882e-02 -100 101 -2.00005 5000000 -50000000",
                     "-25 71   7 -9.3262e+01 -100 101 -2.00005 5000000 -50000000",
                     "-14 53  46 -6.7026e-02 -100 101 -2.00005 5000000 -50000000"};

  int a1, a2, a3, a4, a5, a6, a7;
  double f1 = 0.0, f2 = 0.0, q = 0.0;
  for (int i = 0; i < 3; i++) {
    std::istringstream s(a[i]);
    s >> a1 >> a2 >> a3 >> f1 >> a4 >> a5 >> f2 >> a6 >> a7;
    q += (a1 + a2 + a3 + a4 + a5 + a6 + a7 + f1 + f2) / 1000000;
  }
  return q;
}

static void BM_Istream_numbers(benchmark::State& state) {
  double i = 0;
  while (state.KeepRunning())
    benchmark::DoNotOptimize(i += istream_numbers());
}

BENCHMARK(BM_Istream_numbers)->RangeMultiplier(2)->Range(1024, 4096);
BENCHMARK_MAIN();