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// Copyright 2017 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
//
//
// 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/ostringstream.h"
#include <ios>
#include <memory>
#include <ostream>
#include <string>
#include <type_traits>
#include <utility>
#include "gtest/gtest.h"
namespace {
TEST(OStringStream, IsOStream) {
static_assert(
std::is_base_of<std::ostream, absl::strings_internal::OStringStream>(),
"");
}
TEST(OStringStream, ConstructNullptr) {
absl::strings_internal::OStringStream strm(nullptr);
EXPECT_EQ(nullptr, strm.str());
}
TEST(OStringStream, ConstructStr) {
std::string s = "abc";
{
absl::strings_internal::OStringStream strm(&s);
EXPECT_EQ(&s, strm.str());
}
EXPECT_EQ("abc", s);
}
TEST(OStringStream, Destroy) {
std::unique_ptr<std::string> s(new std::string);
absl::strings_internal::OStringStream strm(s.get());
s.reset();
}
TEST(OStringStream, MoveConstruct) {
std::string s = "abc";
{
absl::strings_internal::OStringStream strm1(&s);
strm1 << std::hex << 16;
EXPECT_EQ(&s, strm1.str());
absl::strings_internal::OStringStream strm2(std::move(strm1));
strm2 << 16; // We should still be in base 16.
EXPECT_EQ(&s, strm2.str());
}
EXPECT_EQ("abc1010", s);
}
TEST(OStringStream, MoveAssign) {
std::string s = "abc";
{
absl::strings_internal::OStringStream strm1(&s);
strm1 << std::hex << 16;
EXPECT_EQ(&s, strm1.str());
absl::strings_internal::OStringStream strm2(nullptr);
strm2 = std::move(strm1);
strm2 << 16; // We should still be in base 16.
EXPECT_EQ(&s, strm2.str());
}
EXPECT_EQ("abc1010", s);
}
TEST(OStringStream, Str) {
std::string s1;
absl::strings_internal::OStringStream strm(&s1);
const absl::strings_internal::OStringStream& c_strm(strm);
static_assert(std::is_same<decltype(strm.str()), std::string*>(), "");
static_assert(std::is_same<decltype(c_strm.str()), const std::string*>(), "");
EXPECT_EQ(&s1, strm.str());
EXPECT_EQ(&s1, c_strm.str());
strm.str(&s1);
EXPECT_EQ(&s1, strm.str());
EXPECT_EQ(&s1, c_strm.str());
std::string s2;
strm.str(&s2);
EXPECT_EQ(&s2, strm.str());
EXPECT_EQ(&s2, c_strm.str());
strm.str(nullptr);
EXPECT_EQ(nullptr, strm.str());
EXPECT_EQ(nullptr, c_strm.str());
}
TEST(OStreamStream, WriteToLValue) {
std::string s = "abc";
{
absl::strings_internal::OStringStream strm(&s);
EXPECT_EQ("abc", s);
strm << "";
EXPECT_EQ("abc", s);
strm << 42;
EXPECT_EQ("abc42", s);
strm << 'x' << 'y';
EXPECT_EQ("abc42xy", s);
}
EXPECT_EQ("abc42xy", s);
}
TEST(OStreamStream, WriteToRValue) {
std::string s = "abc";
absl::strings_internal::OStringStream(&s) << "";
EXPECT_EQ("abc", s);
absl::strings_internal::OStringStream(&s) << 42;
EXPECT_EQ("abc42", s);
absl::strings_internal::OStringStream(&s) << 'x' << 'y';
EXPECT_EQ("abc42xy", s);
}
} // namespace