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// Copyright Catch2 Authors
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE.txt or copy at
// https://www.boost.org/LICENSE_1_0.txt)
// SPDX-License-Identifier: BSL-1.0
// Adapted from donated nonius code.
#ifndef CATCH_CHRONOMETER_HPP_INCLUDED
#define CATCH_CHRONOMETER_HPP_INCLUDED
#include <catch2/benchmark/catch_clock.hpp>
#include <catch2/benchmark/catch_optimizer.hpp>
#include <catch2/benchmark/detail/catch_complete_invoke.hpp>
#include <catch2/internal/catch_meta.hpp>
#include <catch2/internal/catch_move_and_forward.hpp>
namespace Catch {
namespace Benchmark {
namespace Detail {
struct ChronometerConcept {
virtual void start() = 0;
virtual void finish() = 0;
virtual ~ChronometerConcept(); // = default;
ChronometerConcept() = default;
ChronometerConcept(ChronometerConcept const&) = default;
ChronometerConcept& operator=(ChronometerConcept const&) = default;
};
template <typename Clock>
struct ChronometerModel final : public ChronometerConcept {
void start() override { started = Clock::now(); }
void finish() override { finished = Clock::now(); }
ClockDuration<Clock> elapsed() const { return finished - started; }
TimePoint<Clock> started;
TimePoint<Clock> finished;
};
} // namespace Detail
struct Chronometer {
public:
template <typename Fun>
void measure(Fun&& fun) { measure(CATCH_FORWARD(fun), is_callable<Fun(int)>()); }
int runs() const { return repeats; }
Chronometer(Detail::ChronometerConcept& meter, int repeats_)
: impl(&meter)
, repeats(repeats_) {}
private:
template <typename Fun>
void measure(Fun&& fun, std::false_type) {
measure([&fun](int) { return fun(); }, std::true_type());
}
template <typename Fun>
void measure(Fun&& fun, std::true_type) {
Detail::optimizer_barrier();
impl->start();
for (int i = 0; i < repeats; ++i) invoke_deoptimized(fun, i);
impl->finish();
Detail::optimizer_barrier();
}
Detail::ChronometerConcept* impl;
int repeats;
};
} // namespace Benchmark
} // namespace Catch
#endif // CATCH_CHRONOMETER_HPP_INCLUDED
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