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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
//
//===----------------------------------------------------------------------===//
// This tests that swapping filebufs works correctly even when the small buffer
// optimization is in use (https://github.com/llvm/llvm-project/issues/49282).
// <fstream>
// template <class charT, class traits = char_traits<charT> >
// class basic_filebuf
// template <class charT, class traits>
// void
// swap(basic_filebuf<charT, traits>& x, basic_filebuf<charT, traits>& y);
#include <fstream>
#include <cassert>
#include "test_macros.h"
#include "platform_support.h"
int main(int, char**)
{
std::string tmpA = get_temp_file_name();
std::string tmpB = get_temp_file_name();
{
std::ofstream sa(tmpA), sb(tmpB);
sa << "AAAA";
sb << "BBBB";
}
std::filebuf f1;
assert(f1.open(tmpA, std::ios_base::in) != 0);
assert(f1.is_open());
f1.pubsetbuf(0, 0);
std::filebuf f2;
assert(f2.open(tmpB, std::ios_base::in) != 0);
assert(f2.is_open());
f2.pubsetbuf(0, 0);
assert(f1.sgetc() == 'A');
assert(f2.sgetc() == 'B');
swap(f1, f2);
assert(f1.is_open());
assert(f2.is_open());
assert(f1.sgetc() == 'B');
assert(f2.sgetc() == 'A');
std::remove(tmpA.c_str());
std::remove(tmpB.c_str());
return 0;
}
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