// 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 #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