File Coverage

/usr/local/lib/perl5/site_perl/5.26.1/x86_64-linux/XS/libcatch.x/i/catch2/benchmark/detail/catch_benchmark_function.hpp

Criterion	Covered	Total	%
statement	0	25	0.0
branch	0	20	0.0
condition			n/a
subroutine			n/a
pod			n/a
total	0	45	0.0

//              Copyright Catch2 Authors
// Distributed under the Boost Software License, Version 1.0.
//   (See accompanying file LICENSE_1_0.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
#include
#include
#include
#include

#include

namespace Catch {
    namespace Benchmark {
        namespace Detail {
            template
            struct is_related
                : std::is_same, std::decay_t> {};

            /// 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 Catch::Detail::unique_ptr clone() const = 0;
                    virtual ~callable(); // = default;

                    callable() = default;
                    callable(callable const&) = default;
                    callable& operator=(callable const&) = default;
                };
                template
                struct model : public callable {
                    model(Fun&& fun_) : fun(CATCH_MOVE(fun_)) {}
                    model(Fun const& fun_) : fun(fun_) {}

                    Catch::Detail::unique_ptr clone() const override {
                        return Catch::Detail::make_unique>( *this );
                    }

                    void call(Chronometer meter) const override {
                        call(meter, is_callable());
                    }
                    void call(Chronometer meter, std::true_type) const {
                        fun(meter);
                    }
                    void call(Chronometer meter, std::false_type) const {
                        meter.measure(fun);
                    }

                    Fun fun;
                };

                struct do_nothing { void operator()() const {} };

                template
                BenchmarkFunction(model* c) : f(c) {}

            public:
                BenchmarkFunction()
                    : f(new model{ {} }) {}

                template
                    std::enable_if_t::value, int> = 0>
                    BenchmarkFunction(Fun&& fun)
                    : f(new model>(CATCH_FORWARD(fun))) {}

                BenchmarkFunction( BenchmarkFunction&& that ) noexcept:
                    f( CATCH_MOVE( that.f ) ) {}

                BenchmarkFunction(BenchmarkFunction const& that)
                    : f(that.f->clone()) {}

                BenchmarkFunction&
                operator=( BenchmarkFunction&& that ) noexcept {
                    f = CATCH_MOVE( that.f );
                    return *this;
                }

                BenchmarkFunction& operator=(BenchmarkFunction const& that) {
                    f = that.f->clone();
                    return *this;
                }

                void operator()(Chronometer meter) const { f->call(meter); }

            private:
                Catch::Detail::unique_ptr f;
            };
        } // namespace Detail
    } // namespace Benchmark
} // namespace Catch

#endif // CATCH_BENCHMARK_FUNCTION_HPP_INCLUDED