73 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// void str(const basic_string<charT,traits,Allocator>& s);15 16#include <sstream>17#include <string>18#include <cassert>19 20#include "test_macros.h"21 22struct StringBuf : std::stringbuf {23 explicit StringBuf(const char* s, std::ios_base::openmode mode) : basic_stringbuf(s, mode) {}24 void public_setg(int a, int b, int c) {25 char* p = eback();26 this->setg(p + a, p + b, p + c);27 }28};29 30static void test_altered_sequence_pointers() {31 {32 StringBuf src("hello world", std::ios_base::in);33 src.public_setg(4, 6, 9);34 std::stringbuf dest;35 dest = std::move(src);36 std::string str = dest.str();37 assert(5 <= str.size() && str.size() <= 11);38 LIBCPP_ASSERT(str == "o wor");39 LIBCPP_ASSERT(dest.str() == "o wor");40 }41 {42 StringBuf src("hello world", std::ios_base::in);43 src.public_setg(4, 6, 9);44 std::stringbuf dest;45 dest.swap(src);46 std::string str = dest.str();47 assert(5 <= str.size() && str.size() <= 11);48 LIBCPP_ASSERT(str == "o wor");49 LIBCPP_ASSERT(dest.str() == "o wor");50 }51}52 53int main(int, char**)54{55 test_altered_sequence_pointers();56 {57 std::stringbuf buf("testing");58 assert(buf.str() == "testing");59 buf.str("another test");60 assert(buf.str() == "another test");61 }62#ifndef TEST_HAS_NO_WIDE_CHARACTERS63 {64 std::wstringbuf buf(L"testing");65 assert(buf.str() == L"testing");66 buf.str(L"another test");67 assert(buf.str() == L"another test");68 }69#endif70 71 return 0;72}73