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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
//
//===----------------------------------------------------------------------===//
// <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 temp = get_temp_file_name();
{
std::filebuf f;
assert(f.open(temp.c_str(), std::ios_base::out | std::ios_base::in
| std::ios_base::trunc) != 0);
assert(f.is_open());
assert(f.sputn("123", 3) == 3);
f.pubseekoff(1, std::ios_base::beg);
assert(f.sgetc() == '2');
std::filebuf f2;
swap(f2, f);
assert(!f.is_open());
assert(f2.is_open());
assert(f2.sgetc() == '2');
}
std::remove(temp.c_str());
// lhs uses a small buffer, rhs is empty
{
std::filebuf f;
assert(f.open(temp.c_str(), std::ios_base::out | std::ios_base::in
| std::ios_base::trunc) != 0);
assert(f.is_open());
assert(f.sputn("123", 3) == 3);
f.pubseekoff(1, std::ios_base::beg);
assert(f.sgetc() == '2');
std::filebuf f2;
swap(f, f2);
assert(!f.is_open());
assert(f2.is_open());
assert(f2.sgetc() == '2');
}
std::remove(temp.c_str());
// neither lhs nor rhs use the small buffer
{
std::string tmpA = get_temp_file_name();
std::string tmpB = get_temp_file_name();
{
// currently the small buffer has size 8
std::ofstream sa(tmpA), sb(tmpB);
sa << "0123456789";
sb << "abcdefghij";
}
std::filebuf f1, f2;
assert(f1.open(tmpA, std::ios_base::in) != 0);
assert(f2.open(tmpB, std::ios_base::in) != 0);
assert(f1.sgetc() == '0');
assert(f2.sgetc() == 'a');
swap(f1, f2);
assert(f1.sgetc() == 'a');
assert(f2.sgetc() == '0');
std::remove(tmpA.c_str());
std::remove(tmpB.c_str());
}
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
{
std::wfilebuf f;
assert(f.open(temp.c_str(), std::ios_base::out | std::ios_base::in
| std::ios_base::trunc) != 0);
assert(f.is_open());
assert(f.sputn(L"123", 3) == 3);
f.pubseekoff(1, std::ios_base::beg);
assert(f.sgetc() == L'2');
std::wfilebuf f2;
swap(f2, f);
assert(!f.is_open());
assert(f2.is_open());
assert(f2.sgetc() == L'2');
}
std::remove(temp.c_str());
#endif
return 0;
}
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