Function BM_VariableOp

bench/variables.cpp:15–22

template <typename F>
static void BM_VariableOp(benchmark::State& state, F&& op) {
	auto v = make();
	int i = 0;
	for (auto _: state) {
		op(v, i + 1, i + 1);
		i = (i + 1) % max_vars;
	}
}

static void BM_VariableGet(benchmark::State& state) {
	volatile int x = 0;