Abseil Common Libraries (C++) (grcp 依赖)
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103 lines
2.6 KiB
103 lines
2.6 KiB
7 years ago
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// Copyright 2017 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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// http://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/ostringstream.h"
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#include <memory>
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#include <ostream>
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#include <string>
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#include <type_traits>
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#include "gtest/gtest.h"
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namespace {
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TEST(OStringStream, IsOStream) {
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static_assert(
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std::is_base_of<std::ostream, absl::strings_internal::OStringStream>(),
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"");
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}
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TEST(OStringStream, ConstructDestroy) {
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{
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absl::strings_internal::OStringStream strm(nullptr);
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EXPECT_EQ(nullptr, strm.str());
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}
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{
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std::string s = "abc";
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{
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absl::strings_internal::OStringStream strm(&s);
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EXPECT_EQ(&s, strm.str());
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}
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EXPECT_EQ("abc", s);
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}
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{
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std::unique_ptr<std::string> s(new std::string);
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absl::strings_internal::OStringStream strm(s.get());
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s.reset();
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}
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}
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TEST(OStringStream, Str) {
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std::string s1;
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absl::strings_internal::OStringStream strm(&s1);
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const absl::strings_internal::OStringStream& c_strm(strm);
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static_assert(std::is_same<decltype(strm.str()), std::string*>(), "");
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static_assert(std::is_same<decltype(c_strm.str()), const std::string*>(), "");
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EXPECT_EQ(&s1, strm.str());
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EXPECT_EQ(&s1, c_strm.str());
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strm.str(&s1);
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EXPECT_EQ(&s1, strm.str());
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EXPECT_EQ(&s1, c_strm.str());
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std::string s2;
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strm.str(&s2);
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EXPECT_EQ(&s2, strm.str());
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EXPECT_EQ(&s2, c_strm.str());
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strm.str(nullptr);
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EXPECT_EQ(nullptr, strm.str());
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EXPECT_EQ(nullptr, c_strm.str());
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}
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TEST(OStreamStream, WriteToLValue) {
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std::string s = "abc";
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{
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absl::strings_internal::OStringStream strm(&s);
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EXPECT_EQ("abc", s);
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strm << "";
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EXPECT_EQ("abc", s);
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strm << 42;
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EXPECT_EQ("abc42", s);
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strm << 'x' << 'y';
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EXPECT_EQ("abc42xy", s);
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}
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EXPECT_EQ("abc42xy", s);
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}
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TEST(OStreamStream, WriteToRValue) {
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std::string s = "abc";
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absl::strings_internal::OStringStream(&s) << "";
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EXPECT_EQ("abc", s);
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absl::strings_internal::OStringStream(&s) << 42;
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EXPECT_EQ("abc42", s);
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absl::strings_internal::OStringStream(&s) << 'x' << 'y';
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EXPECT_EQ("abc42xy", s);
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}
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} // namespace
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