Abseil Common Libraries (C++) (grcp 依赖)
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61 lines
1.9 KiB
61 lines
1.9 KiB
4 years ago
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// Copyright 2020 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "absl/strings/internal/string_constant.h"
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#include "absl/meta/type_traits.h"
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#include "gmock/gmock.h"
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#include "gtest/gtest.h"
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namespace {
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using absl::strings_internal::MakeStringConstant;
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struct Callable {
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constexpr absl::string_view operator()() const {
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return absl::string_view("Callable", 8);
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}
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};
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TEST(StringConstant, Traits) {
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constexpr auto str = MakeStringConstant(Callable{});
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using T = decltype(str);
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EXPECT_TRUE(std::is_empty<T>::value);
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EXPECT_TRUE(std::is_trivial<T>::value);
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EXPECT_TRUE(absl::is_trivially_default_constructible<T>::value);
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EXPECT_TRUE(absl::is_trivially_copy_constructible<T>::value);
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EXPECT_TRUE(absl::is_trivially_move_constructible<T>::value);
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EXPECT_TRUE(absl::is_trivially_destructible<T>::value);
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}
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TEST(StringConstant, MakeFromCallable) {
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constexpr auto str = MakeStringConstant(Callable{});
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using T = decltype(str);
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EXPECT_EQ(Callable{}(), T::value);
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EXPECT_EQ(Callable{}(), str());
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}
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TEST(StringConstant, MakeFromStringConstant) {
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// We want to make sure the StringConstant itself is a valid input to the
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// factory function.
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constexpr auto str = MakeStringConstant(Callable{});
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constexpr auto str2 = MakeStringConstant(str);
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using T = decltype(str2);
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EXPECT_EQ(Callable{}(), T::value);
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EXPECT_EQ(Callable{}(), str2());
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}
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} // namespace
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