78 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// <sstream>10 11// template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >12// class basic_stringbuf13 14// explicit basic_stringbuf(ios_base::openmode which = ios_base::in | ios_base::out); // before C++2015// basic_stringbuf() : basic_stringbuf(ios_base::in | ios_base::out) {} // C++2016// explicit basic_stringbuf(ios_base::openmode which); // C++2017 18#include <sstream>19#include <cassert>20 21#include "test_macros.h"22#if TEST_STD_VER >= 1123#include "test_convertible.h"24#endif25 26template<typename CharT>27struct testbuf28 : std::basic_stringbuf<CharT>29{30 void check()31 {32 // LWG299533 // It is implementation-defined whether the sequence pointers (eback(),34 // gptr(), egptr(), pbase(), pptr(), epptr()) are initialized to null35 // pointers.36 // This tests the libc++ specific implementation.37 LIBCPP_ASSERT(this->eback() != nullptr);38 LIBCPP_ASSERT(this->gptr() != nullptr);39 LIBCPP_ASSERT(this->egptr() != nullptr);40 LIBCPP_ASSERT(this->pbase() != nullptr);41 LIBCPP_ASSERT(this->pptr() != nullptr);42 LIBCPP_ASSERT(this->epptr() != nullptr);43 assert(this->str().empty());44 }45};46 47int main(int, char**)48{49 {50 std::stringbuf buf;51 assert(buf.str() == "");52 }53 {54 testbuf<char> buf;55 buf.check();56 }57#ifndef TEST_HAS_NO_WIDE_CHARACTERS58 {59 std::wstringbuf buf;60 assert(buf.str() == L"");61 }62 {63 testbuf<wchar_t> buf;64 buf.check();65 }66#endif67 68#if TEST_STD_VER >= 1169 {70 typedef std::stringbuf B;71 static_assert(test_convertible<B>(), "");72 static_assert(!test_convertible<B, std::ios_base::openmode>(), "");73 }74#endif75 76 return 0;77}78