fixture_test.cpp

static bool have_entered_main = false;
static int num_constructed = 0;

class StaticInitFixtureTest : public ::benchmark::Fixture {
 public:
  StaticInitFixtureTest() {
    ++num_constructed;
    assert(have_entered_main);
  }
};
BENCHMARK_DEFINE_F(StaticInitFixtureTest, ConstructionHappensAtRuntime)(benchmark::State &st) {
    for (auto _ : st) {
    }
}
BENCHMARK_REGISTER_F(StaticInitFixtureTest, ConstructionHappensAtRuntime)->Arg(42);

BENCHMARK_F(StaticInitFixtureTest, ConstructionHappensAtRuntime2)(benchmark::State& st) {
  for (auto _ : st) {
  }
}
int main(int argc, char **argv) {
  benchmark::Initialize(&argc, argv);
  assert(num_constructed == 0);
  have_entered_main = true;
  ::benchmark::RunSpecifiedBenchmarks();
  assert(num_constructed == 2);
}