106 lines
3.0 KiB
C++
106 lines
3.0 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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;
|
|
}
|