106 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// UNSUPPORTED: c++03, c++11, c++14, c++1710 11// <sstream>12 13// template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT>>14// class basic_stringbuf15 16// basic_stringbuf(basic_stringbuf&& rhs, const Allocator& a);17 18#include <sstream>19#include <cassert>20#include <utility>21 22#include "make_string.h"23#include "test_allocator.h"24#include "test_macros.h"25 26#define STR(S) MAKE_STRING(CharT, S)27#define SV(S) MAKE_STRING_VIEW(CharT, S)28 29template <class CharT>30struct test_stringbuf : std::basic_stringbuf<CharT, std::char_traits<CharT>, test_allocator<CharT>> {31 using std::basic_stringbuf<CharT, std::char_traits<CharT>, test_allocator<CharT>>::basic_stringbuf;32 33 // Checks the following requirement after being moved from:34 // The six pointers of std::basic_streambuf in *this are guaranteed to be different35 // from the corresponding pointers in the moved-from rhs unless null.36 void check_different_pointers(test_stringbuf<CharT> const& other) const {37 assert(this->eback() == nullptr || this->eback() != other.eback());38 assert(this->gptr() == nullptr || this->gptr() != other.gptr());39 assert(this->egptr() == nullptr || this->egptr() != other.egptr());40 assert(this->pbase() == nullptr || this->pbase() != other.pbase());41 assert(this->pptr() == nullptr || this->pptr() != other.pptr());42 assert(this->epptr() == nullptr || this->epptr() != other.epptr());43 }44};45 46template <class CharT>47void test() {48 std::basic_string<CharT> strings[] = {STR(""), STR("short"), STR("loooooooooooooooooooong")};49 for (std::basic_string<CharT> const& s : strings) {50 using StringBuf = std::basic_stringbuf<CharT, std::char_traits<CharT>, test_allocator<CharT>>;51 {52 test_stringbuf<CharT> buf1(s);53 const test_allocator<CharT> a(2);54 test_stringbuf<CharT> buf(std::move(static_cast<StringBuf&>(buf1)), a);55 assert(buf.get_allocator() == a);56 assert(buf.view() == s);57 assert(buf1.view().empty());58 buf.check_different_pointers(buf1);59 }60 {61 test_stringbuf<CharT> buf1(s, std::ios_base::in);62 const test_allocator<CharT> a(2);63 test_stringbuf<CharT> buf(std::move(static_cast<StringBuf&>(buf1)), a);64 assert(buf.get_allocator() == a);65 assert(buf.view() == s);66 assert(buf1.view().empty());67 buf.check_different_pointers(buf1);68 }69 {70 test_stringbuf<CharT> buf1(s, std::ios_base::out);71 const test_allocator<CharT> a(2);72 test_stringbuf<CharT> buf(std::move(static_cast<StringBuf&>(buf1)), a);73 assert(buf.get_allocator() == a);74 assert(buf.view() == s);75 assert(buf1.view().empty());76 buf.check_different_pointers(buf1);77 }78 {79 test_stringbuf<CharT> buf1;80 const test_allocator<CharT> a(2);81 test_stringbuf<CharT> buf(std::move(static_cast<StringBuf&>(buf1)), a);82 assert(buf.get_allocator() == a);83 assert(buf.view().empty());84 assert(buf1.view().empty());85 buf.check_different_pointers(buf1);86 }87 // Use the constructor from an actual std::stringbuf, not test_stringbuf88 {89 StringBuf buf1(s);90 const test_allocator<CharT> a(2);91 StringBuf buf(std::move(buf1), a);92 assert(buf.get_allocator() == a);93 assert(buf.view() == s);94 assert(buf1.view().empty());95 }96 }97}98 99int main(int, char**) {100 test<char>();101#ifndef TEST_HAS_NO_WIDE_CHARACTERS102 test<wchar_t>();103#endif104 return 0;105}106