63 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// This tests that swapping filebufs works correctly even when the small buffer10// optimization is in use (https://llvm.org/PR49938).11 12// <fstream>13 14// template <class charT, class traits = char_traits<charT> >15// class basic_filebuf16 17// template <class charT, class traits>18// void19// swap(basic_filebuf<charT, traits>& x, basic_filebuf<charT, traits>& y);20 21#include <fstream>22#include <cassert>23#include "test_macros.h"24#include "platform_support.h"25 26int main(int, char**)27{28 std::string tmpA = get_temp_file_name();29 std::string tmpB = get_temp_file_name();30 31 {32 std::ofstream sa(tmpA), sb(tmpB);33 sa << "AAAA";34 sb << "BBBB";35 }36 37 std::filebuf f1;38 assert(f1.open(tmpA, std::ios_base::in) != 0);39 assert(f1.is_open());40 f1.pubsetbuf(0, 0);41 42 std::filebuf f2;43 assert(f2.open(tmpB, std::ios_base::in) != 0);44 assert(f2.is_open());45 f2.pubsetbuf(0, 0);46 47 assert(f1.sgetc() == 'A');48 assert(f2.sgetc() == 'B');49 50 swap(f1, f2);51 52 assert(f1.is_open());53 assert(f2.is_open());54 55 assert(f1.sgetc() == 'B');56 assert(f2.sgetc() == 'A');57 58 std::remove(tmpA.c_str());59 std::remove(tmpB.c_str());60 61 return 0;62}63