string_constant_test.cc

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// Copyright 2020 The Abseil Authors.

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//      https://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#include "absl/strings/internal/string_constant.h"

#include "absl/meta/type_traits.h"

#include "gmock/gmock.h"

#include "gtest/gtest.h"

namespace {

using absl::strings_internal::MakeStringConstant;

struct Callable {

  constexpr absl::string_view operator()() const {

    return absl::string_view("Callable", 8);

};

TEST(StringConstant, Traits) {

  constexpr auto str = MakeStringConstant(Callable{});

  using T = decltype(str);

  EXPECT_TRUE(std::is_empty<T>::value);

  EXPECT_TRUE(std::is_trivial<T>::value);

  EXPECT_TRUE(absl::is_trivially_default_constructible<T>::value);

  EXPECT_TRUE(absl::is_trivially_copy_constructible<T>::value);

  EXPECT_TRUE(absl::is_trivially_move_constructible<T>::value);

  EXPECT_TRUE(absl::is_trivially_destructible<T>::value);

TEST(StringConstant, MakeFromCallable) {

  constexpr auto str = MakeStringConstant(Callable{});

  using T = decltype(str);

  EXPECT_EQ(Callable{}(), T::value);

  EXPECT_EQ(Callable{}(), str());

TEST(StringConstant, MakeFromStringConstant) {

  // We want to make sure the StringConstant itself is a valid input to the

  // factory function.

  constexpr auto str = MakeStringConstant(Callable{});

  constexpr auto str2 = MakeStringConstant(str);

  using T = decltype(str2);

  EXPECT_EQ(Callable{}(), T::value);

  EXPECT_EQ(Callable{}(), str2());

}  // namespace