forked from OSchip/llvm-project
42 lines
1.2 KiB
C++
42 lines
1.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef TEST_SUPPORT_COUNTING_PROJECTION_H
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#define TEST_SUPPORT_COUNTING_PROJECTION_H
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#include <functional>
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#include <utility>
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#include "test_macros.h"
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#if TEST_STD_VER > 14
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template <class Proj = std::identity>
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class counting_projection {
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Proj proj_;
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int* count_ = nullptr;
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public:
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constexpr counting_projection() = default;
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constexpr counting_projection(int& count) : count_(&count) {}
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constexpr counting_projection(Proj proj, int& count) : proj_(std::move(proj)), count_(&count) {}
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template <class T>
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constexpr decltype(auto) operator()(T&& value) const {
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++(*count_);
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return std::invoke(proj_, std::forward<T>(value));
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}
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};
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counting_projection(int& count) -> counting_projection<std::identity>;
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template <class Proj>
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counting_projection(Proj proj, int& count) -> counting_projection<Proj>;
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#endif // TEST_STD_VER > 14
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#endif // TEST_SUPPORT_COUNTING_PROJECTION_H
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