xref: /llvm-project-15.0.7/libcxx/test/std/input.output/string.streams/stringbuf/stringbuf.assign/nonmember_swap.pass.cpp (revision f4c1258d)

//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

// <sstream>

// template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
// class basic_stringbuf

// template <class charT, class traits, class Allocator>
//   void swap(basic_stringbuf<charT, traits, Allocator>& x,
//             basic_stringbuf<charT, traits, Allocator>& y);

#include <sstream>
#include <cassert>

#include "test_macros.h"

int main(int, char**)
{
    {
        std::stringbuf buf1("testing");
        std::stringbuf buf;
        swap(buf, buf1);
        assert(buf.str() == "testing");
        assert(buf1.str() == "");
    }
    {
        std::stringbuf buf1("testing", std::ios_base::in);
        std::stringbuf buf;
        swap(buf, buf1);
        assert(buf.str() == "testing");
        assert(buf1.str() == "");
    }
    {
        std::stringbuf buf1("testing", std::ios_base::out);
        std::stringbuf buf;
        swap(buf, buf1);
        assert(buf.str() == "testing");
        assert(buf1.str() == "");
    }
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
    {
        std::wstringbuf buf1(L"testing");
        std::wstringbuf buf;
        swap(buf, buf1);
        assert(buf.str() == L"testing");
        assert(buf1.str() == L"");
    }
    {
        std::wstringbuf buf1(L"testing", std::ios_base::in);
        std::wstringbuf buf;
        swap(buf, buf1);
        assert(buf.str() == L"testing");
        assert(buf1.str() == L"");
    }
    {
        std::wstringbuf buf1(L"testing", std::ios_base::out);
        std::wstringbuf buf;
        swap(buf, buf1);
        assert(buf.str() == L"testing");
        assert(buf1.str() == L"");
    }
#endif // TEST_HAS_NO_WIDE_CHARACTERS

  return 0;
}