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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
//
//===----------------------------------------------------------------------===//
// <sstream>
// template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
// class basic_stringbuf
// explicit basic_stringbuf(ios_base::openmode which = ios_base::in | ios_base::out); // before C++20
// basic_stringbuf() : basic_stringbuf(ios_base::in | ios_base::out) {} // C++20
// explicit basic_stringbuf(ios_base::openmode which); // C++20
// XFAIL: FROZEN-CXX03-HEADERS-FIXME
#include <sstream>
#include <cassert>
#include "test_macros.h"
#if TEST_STD_VER >= 11
#include "test_convertible.h"
#endif
template<typename CharT>
struct testbuf
: std::basic_stringbuf<CharT>
{
void check()
{
// LWG2995
// It is implementation-defined whether the sequence pointers (eback(),
// gptr(), egptr(), pbase(), pptr(), epptr()) are initialized to null
// pointers.
// This tests the libc++ specific implementation.
LIBCPP_ASSERT(this->eback() != nullptr);
LIBCPP_ASSERT(this->gptr() != nullptr);
LIBCPP_ASSERT(this->egptr() != nullptr);
LIBCPP_ASSERT(this->pbase() != nullptr);
LIBCPP_ASSERT(this->pptr() != nullptr);
LIBCPP_ASSERT(this->epptr() != nullptr);
assert(this->str().empty());
}
};
int main(int, char**)
{
{
std::stringbuf buf;
assert(buf.str() == "");
}
{
testbuf<char> buf;
buf.check();
}
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
{
std::wstringbuf buf;
assert(buf.str() == L"");
}
{
testbuf<wchar_t> buf;
buf.check();
}
#endif
#if TEST_STD_VER >= 11
{
typedef std::stringbuf B;
static_assert(test_convertible<B>(), "");
static_assert(!test_convertible<B, std::ios_base::openmode>(), "");
}
#endif
return 0;
}
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