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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_BENCHMARK_FUNCTION_HPP_INCLUDED
#define CATCH_BENCHMARK_FUNCTION_HPP_INCLUDED
#include <catch2/benchmark/catch_chronometer.hpp>
#include <catch2/internal/catch_meta.hpp>
#include <catch2/internal/catch_unique_ptr.hpp>
#include <catch2/internal/catch_move_and_forward.hpp>
#include <type_traits>
namespace Catch {
namespace Benchmark {
namespace Detail {
template <typename T, typename U>
struct is_related
: std::is_same<std::decay_t<T>, std::decay_t<U>> {};
/// We need to reinvent std::function because every piece of code that might add overhead
/// in a measurement context needs to have consistent performance characteristics so that we
/// can account for it in the measurement.
/// Implementations of std::function with optimizations that aren't always applicable, like
/// small buffer optimizations, are not uncommon.
/// This is effectively an implementation of std::function without any such optimizations;
/// it may be slow, but it is consistently slow.
struct BenchmarkFunction {
private:
struct callable {
virtual void call(Chronometer meter) const = 0;
virtual ~callable(); // = default;
callable() = default;
callable(callable&&) = default;
callable& operator=(callable&&) = default;
};
template <typename Fun>
struct model : public callable {
model(Fun&& fun_) : fun(CATCH_MOVE(fun_)) {}
model(Fun const& fun_) : fun(fun_) {}
void call(Chronometer meter) const override {
call(meter, is_callable<Fun(Chronometer)>());
}
void call(Chronometer meter, std::true_type) const {
fun(meter);
}
void call(Chronometer meter, std::false_type) const {
meter.measure(fun);
}
Fun fun;
};
public:
BenchmarkFunction();
template <typename Fun,
std::enable_if_t<!is_related<Fun, BenchmarkFunction>::value, int> = 0>
BenchmarkFunction(Fun&& fun)
: f(new model<std::decay_t<Fun>>(CATCH_FORWARD(fun))) {}
BenchmarkFunction( BenchmarkFunction&& that ) noexcept:
f( CATCH_MOVE( that.f ) ) {}
BenchmarkFunction&
operator=( BenchmarkFunction&& that ) noexcept {
f = CATCH_MOVE( that.f );
return *this;
}
void operator()(Chronometer meter) const { f->call(meter); }
private:
Catch::Detail::unique_ptr<callable> f;
};
} // namespace Detail
} // namespace Benchmark
} // namespace Catch
#endif // CATCH_BENCHMARK_FUNCTION_HPP_INCLUDED
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