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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// <sstream>
// template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
// class basic_stringbuf
// basic_string<charT, traits, Allocator> str() &&;
#include <sstream>
#include <cassert>
#include "make_string.h"
#include "test_macros.h"
#define STR(S) MAKE_STRING(CharT, S)
template <class CharT>
static void test() {
{
std::basic_stringbuf<CharT> buf(STR("testing"));
std::basic_string<CharT> s = std::move(buf).str();
assert(s == STR("testing"));
assert(buf.view().empty());
}
{
std::basic_stringbuf<CharT> buf;
std::basic_string<CharT> s = std::move(buf).str();
assert(s.empty());
assert(buf.view().empty());
}
{
std::basic_stringbuf<CharT> buf(STR("a very long string that exceeds the small string optimization buffer length"));
const CharT* p = buf.view().data();
std::basic_string<CharT> s = std::move(buf).str();
assert(s.data() == p); // the allocation was pilfered
assert(buf.view().empty());
}
}
struct StringBuf : std::stringbuf {
using basic_stringbuf::basic_stringbuf;
void public_setg(int a, int b, int c) {
char* p = eback();
this->setg(p + a, p + b, p + c);
}
};
static void test_altered_sequence_pointers() {
{
auto src = StringBuf("hello world", std::ios_base::in);
src.public_setg(4, 6, 9);
std::stringbuf dest;
dest = std::move(src);
std::string view = std::string(dest.view());
std::string str = std::move(dest).str();
assert(view == str);
LIBCPP_ASSERT(str == "o wor");
assert(dest.str().empty());
assert(dest.view().empty());
}
{
auto src = StringBuf("hello world", std::ios_base::in);
src.public_setg(4, 6, 9);
std::stringbuf dest;
dest.swap(src);
std::string view = std::string(dest.view());
std::string str = std::move(dest).str();
assert(view == str);
LIBCPP_ASSERT(str == "o wor");
assert(dest.str().empty());
assert(dest.view().empty());
}
}
int main(int, char**) {
test<char>();
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
test<wchar_t>();
#endif
test_altered_sequence_pointers();
return 0;
}
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