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- // Copyright 2020 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "base/functional/invoke.h"
- #include <functional>
- #include "testing/gtest/include/gtest/gtest.h"
- namespace base {
- TEST(FunctionalTest, Invoke) {
- struct S {
- int i;
- constexpr int add(int x) const { return i + x; }
- };
- constexpr S s = {1};
- // Note: The tests involving a std::reference_wrapper are not static_asserts,
- // since std::reference_wrapper is not constexpr prior to C++20.
- static_assert(base::invoke(&S::add, s, 2) == 3, "");
- EXPECT_EQ(base::invoke(&S::add, std::ref(s), 2), 3);
- static_assert(base::invoke(&S::add, &s, 3) == 4, "");
- static_assert(base::invoke(&S::i, s) == 1, "");
- EXPECT_EQ(base::invoke(&S::i, std::ref(s)), 1);
- static_assert(base::invoke(&S::i, &s) == 1, "");
- static_assert(base::invoke(std::plus<>(), 1, 2) == 3, "");
- }
- } // namespace base
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