cxx/test/input.output/file.streams/fstreams/filebuf.members/open_pointer.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// <fstream>

// basic_filebuf<charT,traits>* open(const char* s, ios_base::openmode mode);

#include <fstream>
#include <cassert>

int main()
{
    char temp[L_tmpnam];
    tmpnam(temp);
    {
        std::filebuf f;
        assert(f.open(temp, std::ios_base::out) != 0);
        assert(f.is_open());
        assert(f.sputn("123", 3) == 3);
    }
    {
        std::filebuf f;
        assert(f.open(temp, std::ios_base::in) != 0);
        assert(f.is_open());
        assert(f.sbumpc() == '1');
        assert(f.sbumpc() == '2');
        assert(f.sbumpc() == '3');
    }
    remove(temp);
    {
        std::wfilebuf f;
        assert(f.open(temp, std::ios_base::out) != 0);
        assert(f.is_open());
        assert(f.sputn(L"123", 3) == 3);
    }
    {
        std::wfilebuf f;
        assert(f.open(temp, std::ios_base::in) != 0);
        assert(f.is_open());
        assert(f.sbumpc() == L'1');
        assert(f.sbumpc() == L'2');
        assert(f.sbumpc() == L'3');
    }
    remove(temp);
}