include/fstream

// -*- C++ -*-
//===------------------------- fstream ------------------------------------===//
//
// 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.
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_FSTREAM
#define _LIBCPP_FSTREAM

/*
 fstream synopsis

template <class charT, class traits = char_traits<charT> >
class basic_filebuf
 : public basic_streambuf<charT, traits>
{
public:
 typedef charT char_type;
 typedef traits traits_type;
 typedef typename traits_type::int_type int_type;
 typedef typename traits_type::pos_type pos_type;
 typedef typename traits_type::off_type off_type;

 // 27.9.1.2 Constructors/destructor:
 basic_filebuf();
 basic_filebuf(basic_filebuf&& rhs);
 virtual ~basic_filebuf();

 // 27.9.1.3 Assign/swap:
 basic_filebuf& operator=(basic_filebuf&& rhs);
 void swap(basic_filebuf& rhs);

 // 27.9.1.4 Members:
 bool is_open() const;
 basic_filebuf* open(const char* s, ios_base::openmode mode);
 basic_filebuf* open(const string& s, ios_base::openmode mode);
 basic_filebuf* close();

protected:
 // 27.9.1.5 Overridden virtual functions:
 virtual streamsize showmanyc();
 virtual int_type underflow();
 virtual int_type uflow();
 virtual int_type pbackfail(int_type c = traits_type::eof());
 virtual int_type overflow (int_type c = traits_type::eof());
 virtual basic_streambuf<char_type, traits_type>* setbuf(char_type* s, streamsize n);
 virtual pos_type seekoff(off_type off, ios_base::seekdir way,
 ios_base::openmode which = ios_base::in | ios_base::out);
 virtual pos_type seekpos(pos_type sp,
 ios_base::openmode which = ios_base::in | ios_base::out);
 virtual int sync();
 virtual void imbue(const locale& loc);
};

template <class charT, class traits>
 void
 swap(basic_filebuf<charT, traits>& x, basic_filebuf<charT, traits>& y);

typedef basic_filebuf<char> filebuf;
typedef basic_filebuf<wchar_t> wfilebuf;

template <class charT, class traits = char_traits<charT> >
class basic_ifstream
 : public basic_istream<charT,traits>
{
public:
 typedef charT char_type;
 typedef traits traits_type;
 typedef typename traits_type::int_type int_type;
 typedef typename traits_type::pos_type pos_type;
 typedef typename traits_type::off_type off_type;

 basic_ifstream();
 explicit basic_ifstream(const char* s, ios_base::openmode mode = ios_base::in);
 explicit basic_ifstream(const string& s, ios_base::openmode mode = ios_base::in);
 basic_ifstream(basic_ifstream&& rhs);

 basic_ifstream& operator=(basic_ifstream&& rhs);
 void swap(basic_ifstream& rhs);

 basic_filebuf<char_type, traits_type>* rdbuf() const;
 bool is_open() const;
 void open(const char* s, ios_base::openmode mode = ios_base::in);
 void open(const string& s, ios_base::openmode mode = ios_base::in);
 void close();
};

template <class charT, class traits>
 void
 swap(basic_ifstream<charT, traits>& x, basic_ifstream<charT, traits>& y);

typedef basic_ifstream<char> ifstream;
typedef basic_ifstream<wchar_t> wifstream;

template <class charT, class traits = char_traits<charT> >
class basic_ofstream
 : public basic_ostream<charT,traits>
{
public:
 typedef charT char_type;
 typedef traits traits_type;
 typedef typename traits_type::int_type int_type;
 typedef typename traits_type::pos_type pos_type;
 typedef typename traits_type::off_type off_type;

 basic_ofstream();
 explicit basic_ofstream(const char* s, ios_base::openmode mode = ios_base::out);
 explicit basic_ofstream(const string& s, ios_base::openmode mode = ios_base::out);
 basic_ofstream(basic_ofstream&& rhs);

 basic_ofstream& operator=(basic_ofstream&& rhs);
 void swap(basic_ofstream& rhs);

 basic_filebuf<char_type, traits_type>* rdbuf() const;
 bool is_open() const;
 void open(const char* s, ios_base::openmode mode = ios_base::out);
 void open(const string& s, ios_base::openmode mode = ios_base::out);
 void close();
};

template <class charT, class traits>
 void
 swap(basic_ofstream<charT, traits>& x, basic_ofstream<charT, traits>& y);

typedef basic_ofstream<char> ofstream;
typedef basic_ofstream<wchar_t> wofstream;

template <class charT, class traits=char_traits<charT> >
class basic_fstream
 : public basic_iostream<charT,traits>
{
public:
 typedef charT char_type;
 typedef traits traits_type;
 typedef typename traits_type::int_type int_type;
 typedef typename traits_type::pos_type pos_type;
 typedef typename traits_type::off_type off_type;

 basic_fstream();
 explicit basic_fstream(const char* s, ios_base::openmode mode = ios_base::in|ios_base::out);
 explicit basic_fstream(const string& s, ios_base::openmode mode = ios_base::in|ios_base::out);
 basic_fstream(basic_fstream&& rhs);

 basic_fstream& operator=(basic_fstream&& rhs);
 void swap(basic_fstream& rhs);

 basic_filebuf<char_type, traits_type>* rdbuf() const;
 bool is_open() const;
 void open(const char* s, ios_base::openmode mode = ios_base::in|ios_base::out);
 void open(const string& s, ios_base::openmode mode = ios_base::in|ios_base::out);
 void close();
};

template <class charT, class traits>
 void swap(basic_fstream<charT, traits>& x, basic_fstream<charT, traits>& y);

typedef basic_fstream<char> fstream;
typedef basic_fstream<wchar_t> wfstream;

} // std

*/

#include <__config>
#include <ostream>
#include <istream>
#include <__locale>
#include <cstdio>

#include <__undef_min_max>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _CharT, class _Traits>
class _LIBCPP_TEMPLATE_VIS basic_filebuf
 : public basic_streambuf<_CharT, _Traits>
{
public:
 typedef _CharT char_type;
 typedef _Traits traits_type;
 typedef typename traits_type::int_type int_type;
 typedef typename traits_type::pos_type pos_type;
 typedef typename traits_type::off_type off_type;
 typedef typename traits_type::state_type state_type;

 // 27.9.1.2 Constructors/destructor:
 basic_filebuf();
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 basic_filebuf(basic_filebuf&& __rhs);
#endif
 virtual ~basic_filebuf();

 // 27.9.1.3 Assign/swap:
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 _LIBCPP_INLINE_VISIBILITY
 basic_filebuf& operator=(basic_filebuf&& __rhs);
#endif
 void swap(basic_filebuf& __rhs);

 // 27.9.1.4 Members:
 _LIBCPP_INLINE_VISIBILITY
 bool is_open() const;
#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
 basic_filebuf* open(const char* __s, ios_base::openmode __mode);
 _LIBCPP_INLINE_VISIBILITY
 basic_filebuf* open(const string& __s, ios_base::openmode __mode);
#endif
 basic_filebuf* close();

protected:
 // 27.9.1.5 Overridden virtual functions:
 virtual int_type underflow();
 virtual int_type pbackfail(int_type __c = traits_type::eof());
 virtual int_type overflow (int_type __c = traits_type::eof());
 virtual basic_streambuf<char_type, traits_type>* setbuf(char_type* __s, streamsize __n);
 virtual pos_type seekoff(off_type __off, ios_base::seekdir __way,
 ios_base::openmode __wch = ios_base::in | ios_base::out);
 virtual pos_type seekpos(pos_type __sp,
 ios_base::openmode __wch = ios_base::in | ios_base::out);
 virtual int sync();
 virtual void imbue(const locale& __loc);

private:
 char* __extbuf_;
 const char* __extbufnext_;
 const char* __extbufend_;
 char __extbuf_min_[8];
 size_t __ebs_;
 char_type* __intbuf_;
 size_t __ibs_;
 FILE* __file_;
 const codecvt<char_type, char, state_type>* __cv_;
 state_type __st_;
 state_type __st_last_;
 ios_base::openmode __om_;
 ios_base::openmode __cm_;
 bool __owns_eb_;
 bool __owns_ib_;
 bool __always_noconv_;

 bool __read_mode();
 void __write_mode();
};

template <class _CharT, class _Traits>
basic_filebuf<_CharT, _Traits>::basic_filebuf()
 : __extbuf_(0),
 __extbufnext_(0),
 __extbufend_(0),
 __ebs_(0),
 __intbuf_(0),
 __ibs_(0),
 __file_(0),
 __cv_(nullptr),
 __st_(),
 __st_last_(),
 __om_(0),
 __cm_(0),
 __owns_eb_(false),
 __owns_ib_(false),
 __always_noconv_(false)
{
 if (has_facet<codecvt<char_type, char, state_type> >(this->getloc()))
 {
 __cv_ = &use_facet<codecvt<char_type, char, state_type> >(this->getloc());
 __always_noconv_ = __cv_->always_noconv();
 }
 setbuf(0, 4096);
}

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _CharT, class _Traits>
basic_filebuf<_CharT, _Traits>::basic_filebuf(basic_filebuf&& __rhs)
 : basic_streambuf<_CharT, _Traits>(__rhs)
{
 if (__rhs.__extbuf_ == __rhs.__extbuf_min_)
 {
 __extbuf_ = __extbuf_min_;
 __extbufnext_ = __extbuf_ + (__rhs.__extbufnext_ - __rhs.__extbuf_);
 __extbufend_ = __extbuf_ + (__rhs.__extbufend_ - __rhs.__extbuf_);
 }
 else
 {
 __extbuf_ = __rhs.__extbuf_;
 __extbufnext_ = __rhs.__extbufnext_;
 __extbufend_ = __rhs.__extbufend_;
 }
 __ebs_ = __rhs.__ebs_;
 __intbuf_ = __rhs.__intbuf_;
 __ibs_ = __rhs.__ibs_;
 __file_ = __rhs.__file_;
 __cv_ = __rhs.__cv_;
 __st_ = __rhs.__st_;
 __st_last_ = __rhs.__st_last_;
 __om_ = __rhs.__om_;
 __cm_ = __rhs.__cm_;
 __owns_eb_ = __rhs.__owns_eb_;
 __owns_ib_ = __rhs.__owns_ib_;
 __always_noconv_ = __rhs.__always_noconv_;
 if (__rhs.pbase())
 {
 if (__rhs.pbase() == __rhs.__intbuf_)
 this->setp(__intbuf_, __intbuf_ + (__rhs. epptr() - __rhs.pbase()));
 else
 this->setp((char_type*)__extbuf_,
 (char_type*)__extbuf_ + (__rhs. epptr() - __rhs.pbase()));
 this->pbump(__rhs. pptr() - __rhs.pbase());
 }
 else if (__rhs.eback())
 {
 if (__rhs.eback() == __rhs.__intbuf_)
 this->setg(__intbuf_, __intbuf_ + (__rhs.gptr() - __rhs.eback()),
 __intbuf_ + (__rhs.egptr() - __rhs.eback()));
 else
 this->setg((char_type*)__extbuf_,
 (char_type*)__extbuf_ + (__rhs.gptr() - __rhs.eback()),
 (char_type*)__extbuf_ + (__rhs.egptr() - __rhs.eback()));
 }
 __rhs.__extbuf_ = 0;
 __rhs.__extbufnext_ = 0;
 __rhs.__extbufend_ = 0;
 __rhs.__ebs_ = 0;
 __rhs.__intbuf_ = 0;
 __rhs.__ibs_ = 0;
 __rhs.__file_ = 0;
 __rhs.__st_ = state_type();
 __rhs.__st_last_ = state_type();
 __rhs.__om_ = 0;
 __rhs.__cm_ = 0;
 __rhs.__owns_eb_ = false;
 __rhs.__owns_ib_ = false;
 __rhs.setg(0, 0, 0);
 __rhs.setp(0, 0);
}

template <class _CharT, class _Traits>
inline
basic_filebuf<_CharT, _Traits>&
basic_filebuf<_CharT, _Traits>::operator=(basic_filebuf&& __rhs)
{
 close();
 swap(__rhs);
 return *this;
}

#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _CharT, class _Traits>
basic_filebuf<_CharT, _Traits>::~basic_filebuf()
{
#ifndef _LIBCPP_NO_EXCEPTIONS
 try
 {
#endif // _LIBCPP_NO_EXCEPTIONS
 close();
#ifndef _LIBCPP_NO_EXCEPTIONS
 }
 catch (...)
 {
 }
#endif // _LIBCPP_NO_EXCEPTIONS
 if (__owns_eb_)
 delete [] __extbuf_;
 if (__owns_ib_)
 delete [] __intbuf_;
}

template <class _CharT, class _Traits>
void
basic_filebuf<_CharT, _Traits>::swap(basic_filebuf& __rhs)
{
 basic_streambuf<char_type, traits_type>::swap(__rhs);
 if (__extbuf_ != __extbuf_min_ && __rhs.__extbuf_ != __rhs.__extbuf_min_)
 {
 _VSTD::swap(__extbuf_, __rhs.__extbuf_);
 _VSTD::swap(__extbufnext_, __rhs.__extbufnext_);
 _VSTD::swap(__extbufend_, __rhs.__extbufend_);
 }
 else
 {
 ptrdiff_t __ln = __extbufnext_ - __extbuf_;
 ptrdiff_t __le = __extbufend_ - __extbuf_;
 ptrdiff_t __rn = __rhs.__extbufnext_ - __rhs.__extbuf_;
 ptrdiff_t __re = __rhs.__extbufend_ - __rhs.__extbuf_;
 if (__extbuf_ == __extbuf_min_ && __rhs.__extbuf_ != __rhs.__extbuf_min_)
 {
 __extbuf_ = __rhs.__extbuf_;
 __rhs.__extbuf_ = __rhs.__extbuf_min_;
 }
 else if (__extbuf_ != __extbuf_min_ && __rhs.__extbuf_ == __rhs.__extbuf_min_)
 {
 __rhs.__extbuf_ = __extbuf_;
 __extbuf_ = __extbuf_min_;
 }
 __extbufnext_ = __extbuf_ + __rn;
 __extbufend_ = __extbuf_ + __re;
 __rhs.__extbufnext_ = __rhs.__extbuf_ + __ln;
 __rhs.__extbufend_ = __rhs.__extbuf_ + __le;
 }
 _VSTD::swap(__ebs_, __rhs.__ebs_);
 _VSTD::swap(__intbuf_, __rhs.__intbuf_);
 _VSTD::swap(__ibs_, __rhs.__ibs_);
 _VSTD::swap(__file_, __rhs.__file_);
 _VSTD::swap(__cv_, __rhs.__cv_);
 _VSTD::swap(__st_, __rhs.__st_);
 _VSTD::swap(__st_last_, __rhs.__st_last_);
 _VSTD::swap(__om_, __rhs.__om_);
 _VSTD::swap(__cm_, __rhs.__cm_);
 _VSTD::swap(__owns_eb_, __rhs.__owns_eb_);
 _VSTD::swap(__owns_ib_, __rhs.__owns_ib_);
 _VSTD::swap(__always_noconv_, __rhs.__always_noconv_);
 if (this->eback() == (char_type*)__rhs.__extbuf_min_)
 {
 ptrdiff_t __n = this->gptr() - this->eback();
 ptrdiff_t __e = this->egptr() - this->eback();
 this->setg((char_type*)__extbuf_min_,
 (char_type*)__extbuf_min_ + __n,
 (char_type*)__extbuf_min_ + __e);
 }
 else if (this->pbase() == (char_type*)__rhs.__extbuf_min_)
 {
 ptrdiff_t __n = this->pptr() - this->pbase();
 ptrdiff_t __e = this->epptr() - this->pbase();
 this->setp((char_type*)__extbuf_min_,
 (char_type*)__extbuf_min_ + __e);
 this->pbump(__n);
 }
 if (__rhs.eback() == (char_type*)__extbuf_min_)
 {
 ptrdiff_t __n = __rhs.gptr() - __rhs.eback();
 ptrdiff_t __e = __rhs.egptr() - __rhs.eback();
 __rhs.setg((char_type*)__rhs.__extbuf_min_,
 (char_type*)__rhs.__extbuf_min_ + __n,
 (char_type*)__rhs.__extbuf_min_ + __e);
 }
 else if (__rhs.pbase() == (char_type*)__extbuf_min_)
 {
 ptrdiff_t __n = __rhs.pptr() - __rhs.pbase();
 ptrdiff_t __e = __rhs.epptr() - __rhs.pbase();
 __rhs.setp((char_type*)__rhs.__extbuf_min_,
 (char_type*)__rhs.__extbuf_min_ + __e);
 __rhs.pbump(__n);
 }
}

template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
void
swap(basic_filebuf<_CharT, _Traits>& __x, basic_filebuf<_CharT, _Traits>& __y)
{
 __x.swap(__y);
}

template <class _CharT, class _Traits>
inline
bool
basic_filebuf<_CharT, _Traits>::is_open() const
{
 return __file_ != 0;
}

#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
template <class _CharT, class _Traits>
basic_filebuf<_CharT, _Traits>*
basic_filebuf<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
{
 basic_filebuf<_CharT, _Traits>* __rt = 0;
 if (__file_ == 0)
 {
 __rt = this;
 const char* __mdstr;
 switch (__mode & ~ios_base::ate)
 {
 case ios_base::out:
 case ios_base::out | ios_base::trunc:
 __mdstr = "w";
 break;
 case ios_base::out | ios_base::app:
 case ios_base::app:
 __mdstr = "a";
 break;
 case ios_base::in:
 __mdstr = "r";
 break;
 case ios_base::in | ios_base::out:
 __mdstr = "r+";
 break;
 case ios_base::in | ios_base::out | ios_base::trunc:
 __mdstr = "w+";
 break;
 case ios_base::in | ios_base::out | ios_base::app:
 case ios_base::in | ios_base::app:
 __mdstr = "a+";
 break;
 case ios_base::out | ios_base::binary:
 case ios_base::out | ios_base::trunc | ios_base::binary:
 __mdstr = "wb";
 break;
 case ios_base::out | ios_base::app | ios_base::binary:
 case ios_base::app | ios_base::binary:
 __mdstr = "ab";
 break;
 case ios_base::in | ios_base::binary:
 __mdstr = "rb";
 break;
 case ios_base::in | ios_base::out | ios_base::binary:
 __mdstr = "r+b";
 break;
 case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary:
 __mdstr = "w+b";
 break;
 case ios_base::in | ios_base::out | ios_base::app | ios_base::binary:
 case ios_base::in | ios_base::app | ios_base::binary:
 __mdstr = "a+b";
 break;
 default:
 __rt = 0;
 break;
 }
 if (__rt)
 {
 __file_ = fopen(__s, __mdstr);
 if (__file_)
 {
 __om_ = __mode;
 if (__mode & ios_base::ate)
 {
 if (fseek(__file_, 0, SEEK_END))
 {
 fclose(__file_);
 __file_ = 0;
 __rt = 0;
 }
 }
 }
 else
 __rt = 0;
 }
 }
 return __rt;
}

template <class _CharT, class _Traits>
inline
basic_filebuf<_CharT, _Traits>*
basic_filebuf<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
{
 return open(__s.c_str(), __mode);
}
#endif

template <class _CharT, class _Traits>
basic_filebuf<_CharT, _Traits>*
basic_filebuf<_CharT, _Traits>::close()
{
 basic_filebuf<_CharT, _Traits>* __rt = 0;
 if (__file_)
 {
 __rt = this;
 unique_ptr<FILE, int(*)(FILE*)> __h(__file_, fclose);
 if (sync())
 __rt = 0;
 if (fclose(__h.release()) == 0)
 __file_ = 0;
 else
 __rt = 0;
 }
 return __rt;
}

template <class _CharT, class _Traits>
typename basic_filebuf<_CharT, _Traits>::int_type
basic_filebuf<_CharT, _Traits>::underflow()
{
 if (__file_ == 0)
 return traits_type::eof();
 bool __initial = __read_mode();
 char_type __1buf;
 if (this->gptr() == 0)
 this->setg(&__1buf, &__1buf+1, &__1buf+1);
 const size_t __unget_sz = __initial ? 0 : min<size_t>((this->egptr() - this->eback()) / 2, 4);
 int_type __c = traits_type::eof();
 if (this->gptr() == this->egptr())
 {
 memmove(this->eback(), this->egptr() - __unget_sz, __unget_sz * sizeof(char_type));
 if (__always_noconv_)
 {
 size_t __nmemb = static_cast<size_t>(this->egptr() - this->eback() - __unget_sz);
 __nmemb = fread(this->eback() + __unget_sz, 1, __nmemb, __file_);
 if (__nmemb != 0)
 {
 this->setg(this->eback(),
 this->eback() + __unget_sz,
 this->eback() + __unget_sz + __nmemb);
 __c = traits_type::to_int_type(*this->gptr());
 }
 }
 else
 {
 _LIBCPP_ASSERT ( !(__extbufnext_ == NULL && (__extbufend_ != __extbufnext_)), "underflow moving from NULL" );
 if (__extbufend_ != __extbufnext_)
 memmove(__extbuf_, __extbufnext_, __extbufend_ - __extbufnext_);
 __extbufnext_ = __extbuf_ + (__extbufend_ - __extbufnext_);
 __extbufend_ = __extbuf_ + (__extbuf_ == __extbuf_min_ ? sizeof(__extbuf_min_) : __ebs_);
 size_t __nmemb = _VSTD::min(static_cast<size_t>(__ibs_ - __unget_sz),
 static_cast<size_t>(__extbufend_ - __extbufnext_));
 codecvt_base::result __r;
 __st_last_ = __st_;
 size_t __nr = fread((void*)__extbufnext_, 1, __nmemb, __file_);
 if (__nr != 0)
 {
 if (!__cv_)
 __throw_bad_cast();

 __extbufend_ = __extbufnext_ + __nr;
 char_type* __inext;
 __r = __cv_->in(__st_, __extbuf_, __extbufend_, __extbufnext_,
 this->eback() + __unget_sz,
 this->eback() + __ibs_, __inext);
 if (__r == codecvt_base::noconv)
 {
 this->setg((char_type*)__extbuf_, (char_type*)__extbuf_, (char_type*)__extbufend_);
 __c = traits_type::to_int_type(*this->gptr());
 }
 else if (__inext != this->eback() + __unget_sz)
 {
 this->setg(this->eback(), this->eback() + __unget_sz, __inext);
 __c = traits_type::to_int_type(*this->gptr());
 }
 }
 }
 }
 else
 __c = traits_type::to_int_type(*this->gptr());
 if (this->eback() == &__1buf)
 this->setg(0, 0, 0);
 return __c;
}

template <class _CharT, class _Traits>
typename basic_filebuf<_CharT, _Traits>::int_type
basic_filebuf<_CharT, _Traits>::pbackfail(int_type __c)
{
 if (__file_ && this->eback() < this->gptr())
 {
 if (traits_type::eq_int_type(__c, traits_type::eof()))
 {
 this->gbump(-1);
 return traits_type::not_eof(__c);
 }
 if ((__om_ & ios_base::out) ||
 traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1]))
 {
 this->gbump(-1);
 *this->gptr() = traits_type::to_char_type(__c);
 return __c;
 }
 }
 return traits_type::eof();
}

template <class _CharT, class _Traits>
typename basic_filebuf<_CharT, _Traits>::int_type
basic_filebuf<_CharT, _Traits>::overflow(int_type __c)
{
 if (__file_ == 0)
 return traits_type::eof();
 __write_mode();
 char_type __1buf;
 char_type* __pb_save = this->pbase();
 char_type* __epb_save = this->epptr();
 if (!traits_type::eq_int_type(__c, traits_type::eof()))
 {
 if (this->pptr() == 0)
 this->setp(&__1buf, &__1buf+1);
 *this->pptr() = traits_type::to_char_type(__c);
 this->pbump(1);
 }
 if (this->pptr() != this->pbase())
 {
 if (__always_noconv_)
 {
 size_t __nmemb = static_cast<size_t>(this->pptr() - this->pbase());
 if (fwrite(this->pbase(), sizeof(char_type), __nmemb, __file_) != __nmemb)
 return traits_type::eof();
 }
 else
 {
 char* __extbe = __extbuf_;
 codecvt_base::result __r;
 do
 {
 if (!__cv_)
 __throw_bad_cast();

 const char_type* __e;
 __r = __cv_->out(__st_, this->pbase(), this->pptr(), __e,
 __extbuf_, __extbuf_ + __ebs_, __extbe);
 if (__e == this->pbase())
 return traits_type::eof();
 if (__r == codecvt_base::noconv)
 {
 size_t __nmemb = static_cast<size_t>(this->pptr() - this->pbase());
 if (fwrite(this->pbase(), 1, __nmemb, __file_) != __nmemb)
 return traits_type::eof();
 }
 else if (__r == codecvt_base::ok || __r == codecvt_base::partial)
 {
 size_t __nmemb = static_cast<size_t>(__extbe - __extbuf_);
 if (fwrite(__extbuf_, 1, __nmemb, __file_) != __nmemb)
 return traits_type::eof();
 if (__r == codecvt_base::partial)
 {
 this->setp((char_type*)__e, this->pptr());
 this->pbump(this->epptr() - this->pbase());
 }
 }
 else
 return traits_type::eof();
 } while (__r == codecvt_base::partial);
 }
 this->setp(__pb_save, __epb_save);
 }
 return traits_type::not_eof(__c);
}

template <class _CharT, class _Traits>
basic_streambuf<_CharT, _Traits>*
basic_filebuf<_CharT, _Traits>::setbuf(char_type* __s, streamsize __n)
{
 this->setg(0, 0, 0);
 this->setp(0, 0);
 if (__owns_eb_)
 delete [] __extbuf_;
 if (__owns_ib_)
 delete [] __intbuf_;
 __ebs_ = __n;
 if (__ebs_ > sizeof(__extbuf_min_))
 {
 if (__always_noconv_ && __s)
 {
 __extbuf_ = (char*)__s;
 __owns_eb_ = false;
 }
 else
 {
 __extbuf_ = new char[__ebs_];
 __owns_eb_ = true;
 }
 }
 else
 {
 __extbuf_ = __extbuf_min_;
 __ebs_ = sizeof(__extbuf_min_);
 __owns_eb_ = false;
 }
 if (!__always_noconv_)
 {
 __ibs_ = max<streamsize>(__n, sizeof(__extbuf_min_));
 if (__s && __ibs_ >= sizeof(__extbuf_min_))
 {
 __intbuf_ = __s;
 __owns_ib_ = false;
 }
 else
 {
 __intbuf_ = new char_type[__ibs_];
 __owns_ib_ = true;
 }
 }
 else
 {
 __ibs_ = 0;
 __intbuf_ = 0;
 __owns_ib_ = false;
 }
 return this;
}

template <class _CharT, class _Traits>
typename basic_filebuf<_CharT, _Traits>::pos_type
basic_filebuf<_CharT, _Traits>::seekoff(off_type __off, ios_base::seekdir __way,
 ios_base::openmode)
{
 if (!__cv_)
 __throw_bad_cast();

 int __width = __cv_->encoding();
 if (__file_ == 0 || (__width <= 0 && __off != 0) || sync())
 return pos_type(off_type(-1));
 // __width > 0 || __off == 0
 int __whence;
 switch (__way)
 {
 case ios_base::beg:
 __whence = SEEK_SET;
 break;
 case ios_base::cur:
 __whence = SEEK_CUR;
 break;
 case ios_base::end:
 __whence = SEEK_END;
 break;
 default:
 return pos_type(off_type(-1));
 }
#if defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS)
 if (fseek(__file_, __width > 0 ? __width * __off : 0, __whence))
 return pos_type(off_type(-1));
 pos_type __r = ftell(__file_);
#else
 if (fseeko(__file_, __width > 0 ? __width * __off : 0, __whence))
 return pos_type(off_type(-1));
 pos_type __r = ftello(__file_);
#endif
 __r.state(__st_);
 return __r;
}

template <class _CharT, class _Traits>
typename basic_filebuf<_CharT, _Traits>::pos_type
basic_filebuf<_CharT, _Traits>::seekpos(pos_type __sp, ios_base::openmode)
{
 if (__file_ == 0 || sync())
 return pos_type(off_type(-1));
#if defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS)
 if (fseek(__file_, __sp, SEEK_SET))
 return pos_type(off_type(-1));
#else
 if (fseeko(__file_, __sp, SEEK_SET))
 return pos_type(off_type(-1));
#endif
 __st_ = __sp.state();
 return __sp;
}

template <class _CharT, class _Traits>
int
basic_filebuf<_CharT, _Traits>::sync()
{
 if (__file_ == 0)
 return 0;
 if (!__cv_)
 __throw_bad_cast();

 if (__cm_ & ios_base::out)
 {
 if (this->pptr() != this->pbase())
 if (overflow() == traits_type::eof())
 return -1;
 codecvt_base::result __r;
 do
 {
 char* __extbe;
 __r = __cv_->unshift(__st_, __extbuf_, __extbuf_ + __ebs_, __extbe);
 size_t __nmemb = static_cast<size_t>(__extbe - __extbuf_);
 if (fwrite(__extbuf_, 1, __nmemb, __file_) != __nmemb)
 return -1;
 } while (__r == codecvt_base::partial);
 if (__r == codecvt_base::error)
 return -1;
 if (fflush(__file_))
 return -1;
 }
 else if (__cm_ & ios_base::in)
 {
 off_type __c;
 state_type __state = __st_last_;
 bool __update_st = false;
 if (__always_noconv_)
 __c = this->egptr() - this->gptr();
 else
 {
 int __width = __cv_->encoding();
 __c = __extbufend_ - __extbufnext_;
 if (__width > 0)
 __c += __width * (this->egptr() - this->gptr());
 else
 {
 if (this->gptr() != this->egptr())
 {
 const int __off = __cv_->length(__state, __extbuf_,
 __extbufnext_,
 this->gptr() - this->eback());
 __c += __extbufnext_ - __extbuf_ - __off;
 __update_st = true;
 }
 }
 }
#if defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS)
 if (fseek(__file_, -__c, SEEK_CUR))
 return -1;
#else
 if (fseeko(__file_, -__c, SEEK_CUR))
 return -1;
#endif
 if (__update_st)
 __st_ = __state;
 __extbufnext_ = __extbufend_ = __extbuf_;
 this->setg(0, 0, 0);
 __cm_ = 0;
 }
 return 0;
}

template <class _CharT, class _Traits>
void
basic_filebuf<_CharT, _Traits>::imbue(const locale& __loc)
{
 sync();
 __cv_ = &use_facet<codecvt<char_type, char, state_type> >(__loc);
 bool __old_anc = __always_noconv_;
 __always_noconv_ = __cv_->always_noconv();
 if (__old_anc != __always_noconv_)
 {
 this->setg(0, 0, 0);
 this->setp(0, 0);
 // invariant, char_type is char, else we couldn't get here
 if (__always_noconv_) // need to dump __intbuf_
 {
 if (__owns_eb_)
 delete [] __extbuf_;
 __owns_eb_ = __owns_ib_;
 __ebs_ = __ibs_;
 __extbuf_ = (char*)__intbuf_;
 __ibs_ = 0;
 __intbuf_ = 0;
 __owns_ib_ = false;
 }
 else // need to obtain an __intbuf_.
 { // If __extbuf_ is user-supplied, use it, else new __intbuf_
 if (!__owns_eb_ && __extbuf_ != __extbuf_min_)
 {
 __ibs_ = __ebs_;
 __intbuf_ = (char_type*)__extbuf_;
 __owns_ib_ = false;
 __extbuf_ = new char[__ebs_];
 __owns_eb_ = true;
 }
 else
 {
 __ibs_ = __ebs_;
 __intbuf_ = new char_type[__ibs_];
 __owns_ib_ = true;
 }
 }
 }
}

template <class _CharT, class _Traits>
bool
basic_filebuf<_CharT, _Traits>::__read_mode()
{
 if (!(__cm_ & ios_base::in))
 {
 this->setp(0, 0);
 if (__always_noconv_)
 this->setg((char_type*)__extbuf_,
 (char_type*)__extbuf_ + __ebs_,
 (char_type*)__extbuf_ + __ebs_);
 else
 this->setg(__intbuf_, __intbuf_ + __ibs_, __intbuf_ + __ibs_);
 __cm_ = ios_base::in;
 return true;
 }
 return false;
}

template <class _CharT, class _Traits>
void
basic_filebuf<_CharT, _Traits>::__write_mode()
{
 if (!(__cm_ & ios_base::out))
 {
 this->setg(0, 0, 0);
 if (__ebs_ > sizeof(__extbuf_min_))
 {
 if (__always_noconv_)
 this->setp((char_type*)__extbuf_,
 (char_type*)__extbuf_ + (__ebs_ - 1));
 else
 this->setp(__intbuf_, __intbuf_ + (__ibs_ - 1));
 }
 else
 this->setp(0, 0);
 __cm_ = ios_base::out;
 }
}

// basic_ifstream

template <class _CharT, class _Traits>
class _LIBCPP_TEMPLATE_VIS basic_ifstream
 : public basic_istream<_CharT, _Traits>
{
public:
 typedef _CharT char_type;
 typedef _Traits traits_type;
 typedef typename traits_type::int_type int_type;
 typedef typename traits_type::pos_type pos_type;
 typedef typename traits_type::off_type off_type;

 _LIBCPP_INLINE_VISIBILITY
 basic_ifstream();
#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
 _LIBCPP_INLINE_VISIBILITY
 explicit basic_ifstream(const char* __s, ios_base::openmode __mode = ios_base::in);
 _LIBCPP_INLINE_VISIBILITY
 explicit basic_ifstream(const string& __s, ios_base::openmode __mode = ios_base::in);
#endif
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 _LIBCPP_INLINE_VISIBILITY
 basic_ifstream(basic_ifstream&& __rhs);
#endif

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 _LIBCPP_INLINE_VISIBILITY
 basic_ifstream& operator=(basic_ifstream&& __rhs);
#endif
 _LIBCPP_INLINE_VISIBILITY
 void swap(basic_ifstream& __rhs);

 _LIBCPP_INLINE_VISIBILITY
 basic_filebuf<char_type, traits_type>* rdbuf() const;
 _LIBCPP_INLINE_VISIBILITY
 bool is_open() const;
#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
 void open(const char* __s, ios_base::openmode __mode = ios_base::in);
 void open(const string& __s, ios_base::openmode __mode = ios_base::in);
#endif
 _LIBCPP_INLINE_VISIBILITY
 void close();

private:
 basic_filebuf<char_type, traits_type> __sb_;
};

template <class _CharT, class _Traits>
inline
basic_ifstream<_CharT, _Traits>::basic_ifstream()
 : basic_istream<char_type, traits_type>(&__sb_)
{
}

#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
template <class _CharT, class _Traits>
inline
basic_ifstream<_CharT, _Traits>::basic_ifstream(const char* __s, ios_base::openmode __mode)
 : basic_istream<char_type, traits_type>(&__sb_)
{
 if (__sb_.open(__s, __mode | ios_base::in) == 0)
 this->setstate(ios_base::failbit);
}

template <class _CharT, class _Traits>
inline
basic_ifstream<_CharT, _Traits>::basic_ifstream(const string& __s, ios_base::openmode __mode)
 : basic_istream<char_type, traits_type>(&__sb_)
{
 if (__sb_.open(__s, __mode | ios_base::in) == 0)
 this->setstate(ios_base::failbit);
}
#endif

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _CharT, class _Traits>
inline
basic_ifstream<_CharT, _Traits>::basic_ifstream(basic_ifstream&& __rhs)
 : basic_istream<char_type, traits_type>(_VSTD::move(__rhs)),
 __sb_(_VSTD::move(__rhs.__sb_))
{
 this->set_rdbuf(&__sb_);
}

template <class _CharT, class _Traits>
inline
basic_ifstream<_CharT, _Traits>&
basic_ifstream<_CharT, _Traits>::operator=(basic_ifstream&& __rhs)
{
 basic_istream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
 __sb_ = _VSTD::move(__rhs.__sb_);
 return *this;
}

#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _CharT, class _Traits>
inline
void
basic_ifstream<_CharT, _Traits>::swap(basic_ifstream& __rhs)
{
 basic_istream<char_type, traits_type>::swap(__rhs);
 __sb_.swap(__rhs.__sb_);
}

template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
void
swap(basic_ifstream<_CharT, _Traits>& __x, basic_ifstream<_CharT, _Traits>& __y)
{
 __x.swap(__y);
}

template <class _CharT, class _Traits>
inline
basic_filebuf<_CharT, _Traits>*
basic_ifstream<_CharT, _Traits>::rdbuf() const
{
 return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
}

template <class _CharT, class _Traits>
inline
bool
basic_ifstream<_CharT, _Traits>::is_open() const
{
 return __sb_.is_open();
}

#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
template <class _CharT, class _Traits>
void
basic_ifstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
{
 if (__sb_.open(__s, __mode | ios_base::in))
 this->clear();
 else
 this->setstate(ios_base::failbit);
}

template <class _CharT, class _Traits>
void
basic_ifstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
{
 if (__sb_.open(__s, __mode | ios_base::in))
 this->clear();
 else
 this->setstate(ios_base::failbit);
}
#endif

template <class _CharT, class _Traits>
inline
void
basic_ifstream<_CharT, _Traits>::close()
{
 if (__sb_.close() == 0)
 this->setstate(ios_base::failbit);
}

// basic_ofstream

template <class _CharT, class _Traits>
class _LIBCPP_TEMPLATE_VIS basic_ofstream
 : public basic_ostream<_CharT, _Traits>
{
public:
 typedef _CharT char_type;
 typedef _Traits traits_type;
 typedef typename traits_type::int_type int_type;
 typedef typename traits_type::pos_type pos_type;
 typedef typename traits_type::off_type off_type;

 _LIBCPP_INLINE_VISIBILITY
 basic_ofstream();
 _LIBCPP_INLINE_VISIBILITY
 explicit basic_ofstream(const char* __s, ios_base::openmode __mode = ios_base::out);
 _LIBCPP_INLINE_VISIBILITY
 explicit basic_ofstream(const string& __s, ios_base::openmode __mode = ios_base::out);
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 _LIBCPP_INLINE_VISIBILITY
 basic_ofstream(basic_ofstream&& __rhs);
#endif

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 _LIBCPP_INLINE_VISIBILITY
 basic_ofstream& operator=(basic_ofstream&& __rhs);
#endif
 _LIBCPP_INLINE_VISIBILITY
 void swap(basic_ofstream& __rhs);

 _LIBCPP_INLINE_VISIBILITY
 basic_filebuf<char_type, traits_type>* rdbuf() const;
 _LIBCPP_INLINE_VISIBILITY
 bool is_open() const;
#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
 void open(const char* __s, ios_base::openmode __mode = ios_base::out);
 void open(const string& __s, ios_base::openmode __mode = ios_base::out);
#endif
 _LIBCPP_INLINE_VISIBILITY
 void close();

private:
 basic_filebuf<char_type, traits_type> __sb_;
};

template <class _CharT, class _Traits>
inline
basic_ofstream<_CharT, _Traits>::basic_ofstream()
 : basic_ostream<char_type, traits_type>(&__sb_)
{
}

#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
template <class _CharT, class _Traits>
inline
basic_ofstream<_CharT, _Traits>::basic_ofstream(const char* __s, ios_base::openmode __mode)
 : basic_ostream<char_type, traits_type>(&__sb_)
{
 if (__sb_.open(__s, __mode | ios_base::out) == 0)
 this->setstate(ios_base::failbit);
}

template <class _CharT, class _Traits>
inline
basic_ofstream<_CharT, _Traits>::basic_ofstream(const string& __s, ios_base::openmode __mode)
 : basic_ostream<char_type, traits_type>(&__sb_)
{
 if (__sb_.open(__s, __mode | ios_base::out) == 0)
 this->setstate(ios_base::failbit);
}
#endif

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _CharT, class _Traits>
inline
basic_ofstream<_CharT, _Traits>::basic_ofstream(basic_ofstream&& __rhs)
 : basic_ostream<char_type, traits_type>(_VSTD::move(__rhs)),
 __sb_(_VSTD::move(__rhs.__sb_))
{
 this->set_rdbuf(&__sb_);
}

template <class _CharT, class _Traits>
inline
basic_ofstream<_CharT, _Traits>&
basic_ofstream<_CharT, _Traits>::operator=(basic_ofstream&& __rhs)
{
 basic_ostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
 __sb_ = _VSTD::move(__rhs.__sb_);
 return *this;
}

#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _CharT, class _Traits>
inline
void
basic_ofstream<_CharT, _Traits>::swap(basic_ofstream& __rhs)
{
 basic_ostream<char_type, traits_type>::swap(__rhs);
 __sb_.swap(__rhs.__sb_);
}

template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
void
swap(basic_ofstream<_CharT, _Traits>& __x, basic_ofstream<_CharT, _Traits>& __y)
{
 __x.swap(__y);
}

template <class _CharT, class _Traits>
inline
basic_filebuf<_CharT, _Traits>*
basic_ofstream<_CharT, _Traits>::rdbuf() const
{
 return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
}

template <class _CharT, class _Traits>
inline
bool
basic_ofstream<_CharT, _Traits>::is_open() const
{
 return __sb_.is_open();
}

#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
template <class _CharT, class _Traits>
void
basic_ofstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
{
 if (__sb_.open(__s, __mode | ios_base::out))
 this->clear();
 else
 this->setstate(ios_base::failbit);
}

template <class _CharT, class _Traits>
void
basic_ofstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
{
 if (__sb_.open(__s, __mode | ios_base::out))
 this->clear();
 else
 this->setstate(ios_base::failbit);
}
#endif

template <class _CharT, class _Traits>
inline
void
basic_ofstream<_CharT, _Traits>::close()
{
 if (__sb_.close() == 0)
 this->setstate(ios_base::failbit);
}

// basic_fstream

template <class _CharT, class _Traits>
class _LIBCPP_TEMPLATE_VIS basic_fstream
 : public basic_iostream<_CharT, _Traits>
{
public:
 typedef _CharT char_type;
 typedef _Traits traits_type;
 typedef typename traits_type::int_type int_type;
 typedef typename traits_type::pos_type pos_type;
 typedef typename traits_type::off_type off_type;

 _LIBCPP_INLINE_VISIBILITY
 basic_fstream();
#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
 _LIBCPP_INLINE_VISIBILITY
 explicit basic_fstream(const char* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
 _LIBCPP_INLINE_VISIBILITY
 explicit basic_fstream(const string& __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
#endif
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 _LIBCPP_INLINE_VISIBILITY
 basic_fstream(basic_fstream&& __rhs);
#endif

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 _LIBCPP_INLINE_VISIBILITY
 basic_fstream& operator=(basic_fstream&& __rhs);
#endif
 _LIBCPP_INLINE_VISIBILITY
 void swap(basic_fstream& __rhs);

 _LIBCPP_INLINE_VISIBILITY
 basic_filebuf<char_type, traits_type>* rdbuf() const;
 _LIBCPP_INLINE_VISIBILITY
 bool is_open() const;
#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
 void open(const char* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
 void open(const string& __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
#endif
 _LIBCPP_INLINE_VISIBILITY
 void close();

private:
 basic_filebuf<char_type, traits_type> __sb_;
};

template <class _CharT, class _Traits>
inline
basic_fstream<_CharT, _Traits>::basic_fstream()
 : basic_iostream<char_type, traits_type>(&__sb_)
{
}

#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
template <class _CharT, class _Traits>
inline
basic_fstream<_CharT, _Traits>::basic_fstream(const char* __s, ios_base::openmode __mode)
 : basic_iostream<char_type, traits_type>(&__sb_)
{
 if (__sb_.open(__s, __mode) == 0)
 this->setstate(ios_base::failbit);
}

template <class _CharT, class _Traits>
inline
basic_fstream<_CharT, _Traits>::basic_fstream(const string& __s, ios_base::openmode __mode)
 : basic_iostream<char_type, traits_type>(&__sb_)
{
 if (__sb_.open(__s, __mode) == 0)
 this->setstate(ios_base::failbit);
}
#endif

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _CharT, class _Traits>
inline
basic_fstream<_CharT, _Traits>::basic_fstream(basic_fstream&& __rhs)
 : basic_iostream<char_type, traits_type>(_VSTD::move(__rhs)),
 __sb_(_VSTD::move(__rhs.__sb_))
{
 this->set_rdbuf(&__sb_);
}

template <class _CharT, class _Traits>
inline
basic_fstream<_CharT, _Traits>&
basic_fstream<_CharT, _Traits>::operator=(basic_fstream&& __rhs)
{
 basic_iostream<char_type, traits_type>::operator=(_VSTD::move(__rhs));
 __sb_ = _VSTD::move(__rhs.__sb_);
 return *this;
}

#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _CharT, class _Traits>
inline
void
basic_fstream<_CharT, _Traits>::swap(basic_fstream& __rhs)
{
 basic_iostream<char_type, traits_type>::swap(__rhs);
 __sb_.swap(__rhs.__sb_);
}

template <class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
void
swap(basic_fstream<_CharT, _Traits>& __x, basic_fstream<_CharT, _Traits>& __y)
{
 __x.swap(__y);
}

template <class _CharT, class _Traits>
inline
basic_filebuf<_CharT, _Traits>*
basic_fstream<_CharT, _Traits>::rdbuf() const
{
 return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
}

template <class _CharT, class _Traits>
inline
bool
basic_fstream<_CharT, _Traits>::is_open() const
{
 return __sb_.is_open();
}

#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
template <class _CharT, class _Traits>
void
basic_fstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
{
 if (__sb_.open(__s, __mode))
 this->clear();
 else
 this->setstate(ios_base::failbit);
}

template <class _CharT, class _Traits>
void
basic_fstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode)
{
 if (__sb_.open(__s, __mode))
 this->clear();
 else
 this->setstate(ios_base::failbit);
}
#endif

template <class _CharT, class _Traits>
inline
void
basic_fstream<_CharT, _Traits>::close()
{
 if (__sb_.close() == 0)
 this->setstate(ios_base::failbit);
}

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP_FSTREAM