string_constant_test.cc (1941B)
1 // Copyright 2020 The Abseil Authors. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #include "absl/strings/internal/string_constant.h" 16 17 #include "absl/meta/type_traits.h" 18 #include "gmock/gmock.h" 19 #include "gtest/gtest.h" 20 21 namespace { 22 23 using absl::strings_internal::MakeStringConstant; 24 25 struct Callable { 26 constexpr absl::string_view operator()() const { 27 return absl::string_view("Callable", 8); 28 } 29 }; 30 31 TEST(StringConstant, Traits) { 32 constexpr auto str = MakeStringConstant(Callable{}); 33 using T = decltype(str); 34 35 EXPECT_TRUE(std::is_empty<T>::value); 36 EXPECT_TRUE(std::is_trivial<T>::value); 37 EXPECT_TRUE(absl::is_trivially_default_constructible<T>::value); 38 EXPECT_TRUE(absl::is_trivially_copy_constructible<T>::value); 39 EXPECT_TRUE(absl::is_trivially_move_constructible<T>::value); 40 EXPECT_TRUE(absl::is_trivially_destructible<T>::value); 41 } 42 43 TEST(StringConstant, MakeFromCallable) { 44 constexpr auto str = MakeStringConstant(Callable{}); 45 using T = decltype(str); 46 EXPECT_EQ(Callable{}(), T::value); 47 EXPECT_EQ(Callable{}(), str()); 48 } 49 50 TEST(StringConstant, MakeFromStringConstant) { 51 // We want to make sure the StringConstant itself is a valid input to the 52 // factory function. 53 constexpr auto str = MakeStringConstant(Callable{}); 54 constexpr auto str2 = MakeStringConstant(str); 55 using T = decltype(str2); 56 EXPECT_EQ(Callable{}(), T::value); 57 EXPECT_EQ(Callable{}(), str2()); 58 } 59 60 } // namespace