FM / 8

/usr/include/c++/8

Name	Size	Mode	Actions
backward/	-	0755	rm
bits/	-	0755	rm
debug/	-	0755	rm
decimal/	-	0755	rm
experimental/	-	0755	rm
ext/	-	0755	rm
parallel/	-	0755	rm
profile/	-	0755	rm
tr1/	-	0755	rm
tr2/	-	0755	rm
x86_64-redhat-linux/	-	0755	rm
algorithm	2518	0644	edit dl rm
any	18604	0644	edit dl rm
array	11657	0644	edit dl rm
atomic	41057	0644	edit dl rm
bitset	45910	0644	edit dl rm
cassert	1648	0644	edit dl rm
ccomplex	1335	0644	edit dl rm
cctype	2409	0644	edit dl rm
cerrno	1770	0644	edit dl rm
cfenv	2051	0644	edit dl rm
cfloat	1889	0644	edit dl rm
charconv	16708	0644	edit dl rm
chrono	29874	0644	edit dl rm
cinttypes	2157	0644	edit dl rm
ciso646	1464	0644	edit dl rm
climits	1913	0644	edit dl rm
clocale	1905	0644	edit dl rm
cmath	48142	0644	edit dl rm
codecvt	5341	0644	edit dl rm
complex	54537	0644	edit dl rm
complex.h	1596	0644	edit dl rm
condition_variable	8954	0644	edit dl rm
csetjmp	1949	0644	edit dl rm
csignal	1855	0644	edit dl rm
cstdalign	1407	0644	edit dl rm
cstdarg	1868	0644	edit dl rm
cstdbool	1401	0644	edit dl rm
cstddef	6440	0644	edit dl rm
cstdint	2167	0644	edit dl rm
cstdio	4439	0644	edit dl rm
cstdlib	6325	0644	edit dl rm
cstring	3123	0644	edit dl rm
ctgmath	1360	0644	edit dl rm
ctime	2125	0644	edit dl rm
cuchar	2210	0644	edit dl rm
cwchar	6509	0644	edit dl rm
cwctype	2793	0644	edit dl rm
cxxabi.h	21977	0644	edit dl rm
deque	2665	0644	edit dl rm
exception	4803	0644	edit dl rm
fenv.h	2020	0644	edit dl rm
filesystem	1438	0644	edit dl rm
forward_list	1577	0644	edit dl rm
fstream	36787	0644	edit dl rm
functional	37750	0644	edit dl rm
future	50678	0644	edit dl rm
initializer_list	2974	0644	edit dl rm
iomanip	16547	0644	edit dl rm
ios	1601	0644	edit dl rm
iosfwd	6918	0644	edit dl rm
iostream	2695	0644	edit dl rm
istream	32843	0644	edit dl rm
iterator	2644	0644	edit dl rm
limits	69181	0644	edit dl rm
list	2594	0644	edit dl rm
locale	1488	0644	edit dl rm
map	2559	0644	edit dl rm
math.h	4367	0644	edit dl rm
memory	4711	0644	edit dl rm
mutex	18224	0644	edit dl rm
new	7521	0644	edit dl rm
numeric	5444	0644	edit dl rm
optional	43963	0644	edit dl rm
ostream	22091	0644	edit dl rm
queue	2467	0644	edit dl rm
random	1692	0644	edit dl rm
ratio	19886	0644	edit dl rm
regex	1894	0644	edit dl rm
scoped_allocator	16221	0644	edit dl rm
set	2559	0644	edit dl rm
shared_mutex	19409	0644	edit dl rm
sstream	26871	0644	edit dl rm
stack	2391	0644	edit dl rm
stdexcept	7975	0644	edit dl rm
stdlib.h	2248	0644	edit dl rm
streambuf	30017	0644	edit dl rm
string	1940	0644	edit dl rm
string_view	20791	0644	edit dl rm
system_error	11522	0644	edit dl rm
tgmath.h	1360	0644	edit dl rm
thread	10519	0644	edit dl rm
tuple	60350	0644	edit dl rm
typeindex	3093	0644	edit dl rm
typeinfo	7692	0644	edit dl rm
type_traits	85871	0644	edit dl rm
unordered_map	1848	0644	edit dl rm
unordered_set	1847	0644	edit dl rm
utility	12303	0644	edit dl rm
valarray	40274	0644	edit dl rm
variant	48242	0644	edit dl rm
vector	2747	0644	edit dl rm

Edit: /usr/include/c++/8/ostream (22091B)

// Output streams -*- C++ -*-

// Copyright (C) 1997-2018 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.

/** @file include/ostream
 *  This is a Standard C++ Library header.
 */

//
// ISO C++ 14882: 27.6.2  Output streams
//

#ifndef _GLIBCXX_OSTREAM
#define _GLIBCXX_OSTREAM 1

#pragma GCC system_header

#include <ios>
#include <bits/ostream_insert.h>

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

/**
 * @brief Template class basic_ostream.
 * @ingroup io
 *
 * @tparam _CharT Type of character stream.
 * @tparam _Traits Traits for character type, defaults to
 * char_traits<_CharT>.
 *
 * This is the base class for all output streams. It provides text
 * formatting of all builtin types, and communicates with any class
 * derived from basic_streambuf to do the actual output.
 */
 template<typename _CharT, typename _Traits>
 class basic_ostream : virtual public basic_ios<_CharT, _Traits>
 {
 public:
 // Types (inherited from basic_ios):
 typedef _CharT			 		char_type;
 typedef typename _Traits::int_type 		int_type;
 typedef typename _Traits::pos_type 		pos_type;
 typedef typename _Traits::off_type 		off_type;
 typedef _Traits			 		traits_type;

// Non-standard Types:
 typedef basic_streambuf<_CharT, _Traits> 		__streambuf_type;
 typedef basic_ios<_CharT, _Traits>		__ios_type;
 typedef basic_ostream<_CharT, _Traits>		__ostream_type;
 typedef num_put<_CharT, ostreambuf_iterator<_CharT, _Traits> >
 							__num_put_type;
 typedef ctype<_CharT>	 			__ctype_type;

/**
       *  @brief  Base constructor.
       *
       *  This ctor is almost never called by the user directly, rather from
       *  derived classes' initialization lists, which pass a pointer to
       *  their own stream buffer.
      */
      explicit
      basic_ostream(__streambuf_type* __sb)
      { this->init(__sb); }

/**
       *  @brief  Base destructor.
       *
       *  This does very little apart from providing a virtual base dtor.
      */
      virtual
      ~basic_ostream() { }

/// Safe prefix/suffix operations.
      class sentry;
      friend class sentry;

//@{
 /**
 * @brief Interface for manipulators.
 *
 * Manipulators such as @c std::endl and @c std::hex use these
 * functions in constructs like "std::cout << std::endl". For more
 * information, see the iomanip header.
 */
 __ostream_type&
 operator<<(__ostream_type& (*__pf)(__ostream_type&))
 {
	// _GLIBCXX_RESOLVE_LIB_DEFECTS
	// DR 60. What is a formatted input function?
	// The inserters for manipulators are *not* formatted output functions.
	return __pf(*this);
 }

__ostream_type&
 operator<<(__ios_type& (*__pf)(__ios_type&))
 {
	// _GLIBCXX_RESOLVE_LIB_DEFECTS
	// DR 60. What is a formatted input function?
	// The inserters for manipulators are *not* formatted output functions.
	__pf(*this);
	return *this;
 }

__ostream_type&
 operator<<(ios_base& (*__pf) (ios_base&))
 {
	// _GLIBCXX_RESOLVE_LIB_DEFECTS
	// DR 60. What is a formatted input function?
	// The inserters for manipulators are *not* formatted output functions.
	__pf(*this);
	return *this;
 }
 //@}

//@{
 /**
 * @name Inserters
 *
 * All the @c operator<< functions (aka formatted output
 * functions) have some common behavior. Each starts by
 * constructing a temporary object of type std::basic_ostream::sentry.
 * This can have several effects, concluding with the setting of a
 * status flag; see the sentry documentation for more.
 *
 * If the sentry status is good, the function tries to generate
 * whatever data is appropriate for the type of the argument.
 *
 * If an exception is thrown during insertion, ios_base::badbit
 * will be turned on in the stream's error state without causing an
 * ios_base::failure to be thrown. The original exception will then
 * be rethrown.
 */

//@{
 /**
 * @brief Integer arithmetic inserters
 * @param __n A variable of builtin integral type.
 * @return @c *this if successful
 *
 * These functions use the stream's current locale (specifically, the
 * @c num_get facet) to perform numeric formatting.
 */
 __ostream_type&
 operator<<(long __n)
 { return _M_insert(__n); }

__ostream_type&
 operator<<(unsigned long __n)
 { return _M_insert(__n); }

__ostream_type&
 operator<<(bool __n)
 { return _M_insert(__n); }

__ostream_type&
 operator<<(short __n);

__ostream_type&
 operator<<(unsigned short __n)
 {
	// _GLIBCXX_RESOLVE_LIB_DEFECTS
	// 117. basic_ostream uses nonexistent num_put member functions.
	return _M_insert(static_cast<unsigned long>(__n));
 }

__ostream_type&
 operator<<(int __n);

__ostream_type&
 operator<<(unsigned int __n)
 {
	// _GLIBCXX_RESOLVE_LIB_DEFECTS
	// 117. basic_ostream uses nonexistent num_put member functions.
	return _M_insert(static_cast<unsigned long>(__n));
 }

#ifdef _GLIBCXX_USE_LONG_LONG
 __ostream_type&
 operator<<(long long __n)
 { return _M_insert(__n); }

__ostream_type&
 operator<<(unsigned long long __n)
 { return _M_insert(__n); }
#endif
 //@}

//@{
 /**
 * @brief Floating point arithmetic inserters
 * @param __f A variable of builtin floating point type.
 * @return @c *this if successful
 *
 * These functions use the stream's current locale (specifically, the
 * @c num_get facet) to perform numeric formatting.
 */
 __ostream_type&
 operator<<(double __f)
 { return _M_insert(__f); }

__ostream_type&
 operator<<(float __f)
 {
	// _GLIBCXX_RESOLVE_LIB_DEFECTS
	// 117. basic_ostream uses nonexistent num_put member functions.
	return _M_insert(static_cast<double>(__f));
 }

__ostream_type&
 operator<<(long double __f)
 { return _M_insert(__f); }
 //@}

/**
 * @brief Pointer arithmetic inserters
 * @param __p A variable of pointer type.
 * @return @c *this if successful
 *
 * These functions use the stream's current locale (specifically, the
 * @c num_get facet) to perform numeric formatting.
 */
 __ostream_type&
 operator<<(const void* __p)
 { return _M_insert(__p); }

/**
 * @brief Extracting from another streambuf.
 * @param __sb A pointer to a streambuf
 *
 * This function behaves like one of the basic arithmetic extractors,
 * in that it also constructs a sentry object and has the same error
 * handling behavior.
 *
 * If @p __sb is NULL, the stream will set failbit in its error state.
 *
 * Characters are extracted from @p __sb and inserted into @c *this
 * until one of the following occurs:
 *
 * - the input stream reaches end-of-file,
 * - insertion into the output sequence fails (in this case, the
 * character that would have been inserted is not extracted), or
 * - an exception occurs while getting a character from @p __sb, which
 * sets failbit in the error state
 *
 * If the function inserts no characters, failbit is set.
 */
 __ostream_type&
 operator<<(__streambuf_type* __sb);
 //@}

//@{
      /**
       *  @name Unformatted Output Functions
       *
       *  All the unformatted output functions have some common behavior.
       *  Each starts by constructing a temporary object of type
       *  std::basic_ostream::sentry.  This has several effects, concluding
       *  with the setting of a status flag; see the sentry documentation
       *  for more.
       *
       *  If the sentry status is good, the function tries to generate
       *  whatever data is appropriate for the type of the argument.
       *
       *  If an exception is thrown during insertion, ios_base::badbit
       *  will be turned on in the stream's error state.  If badbit is on in
       *  the stream's exceptions mask, the exception will be rethrown
       *  without completing its actions.
      */

/**
       *  @brief  Simple insertion.
       *  @param  __c  The character to insert.
       *  @return  *this
       *
       *  Tries to insert @p __c.
       *
       *  @note  This function is not overloaded on signed char and
       *         unsigned char.
      */
      __ostream_type&
      put(char_type __c);

/**
       *  @brief  Core write functionality, without sentry.
       *  @param  __s  The array to insert.
       *  @param  __n  Maximum number of characters to insert.
      */
      void
      _M_write(const char_type* __s, streamsize __n)
      {
	const streamsize __put = this->rdbuf()->sputn(__s, __n);
	if (__put != __n)
	  this->setstate(ios_base::badbit);
      }

/**
       *  @brief  Character string insertion.
       *  @param  __s  The array to insert.
       *  @param  __n  Maximum number of characters to insert.
       *  @return  *this
       *
       *  Characters are copied from @p __s and inserted into the stream until
       *  one of the following happens:
       *
       *  - @p __n characters are inserted
       *  - inserting into the output sequence fails (in this case, badbit
       *    will be set in the stream's error state)
       *
       *  @note  This function is not overloaded on signed char and
       *         unsigned char.
      */
      __ostream_type&
      write(const char_type* __s, streamsize __n);
      //@}

/**
       *  @brief  Synchronizing the stream buffer.
       *  @return  *this
       *
       *  If @c rdbuf() is a null pointer, changes nothing.
       *
       *  Otherwise, calls @c rdbuf()->pubsync(), and if that returns -1,
       *  sets badbit.
      */
      __ostream_type&
      flush();

/**
       *  @brief  Getting the current write position.
       *  @return  A file position object.
       *
       *  If @c fail() is not false, returns @c pos_type(-1) to indicate
       *  failure.  Otherwise returns @c rdbuf()->pubseekoff(0,cur,out).
      */
      pos_type
      tellp();

/**
       *  @brief  Changing the current write position.
       *  @param  __pos  A file position object.
       *  @return  *this
       *
       *  If @c fail() is not true, calls @c rdbuf()->pubseekpos(pos).  If
       *  that function fails, sets failbit.
      */
      __ostream_type&
      seekp(pos_type);

/**
       *  @brief  Changing the current write position.
       *  @param  __off  A file offset object.
       *  @param  __dir  The direction in which to seek.
       *  @return  *this
       *
       *  If @c fail() is not true, calls @c rdbuf()->pubseekoff(off,dir).
       *  If that function fails, sets failbit.
      */
       __ostream_type&
      seekp(off_type, ios_base::seekdir);

protected:
      basic_ostream()
      { this->init(0); }

#if __cplusplus >= 201103L
 // Non-standard constructor that does not call init()
 basic_ostream(basic_iostream<_CharT, _Traits>&) { }

basic_ostream(const basic_ostream&) = delete;

basic_ostream(basic_ostream&& __rhs)
      : __ios_type()
      { __ios_type::move(__rhs); }

// 27.7.3.3 Assign/swap

basic_ostream& operator=(const basic_ostream&) = delete;

basic_ostream&
      operator=(basic_ostream&& __rhs)
      {
	swap(__rhs);
	return *this;
      }

void
      swap(basic_ostream& __rhs)
      { __ios_type::swap(__rhs); }
#endif

template<typename _ValueT>
	__ostream_type&
	_M_insert(_ValueT __v);
 };

/**
 * @brief Performs setup work for output streams.
 *
 * Objects of this class are created before all of the standard
 * inserters are run. It is responsible for exception-safe prefix and
 * suffix operations.
 */
 template <typename _CharT, typename _Traits>
 class basic_ostream<_CharT, _Traits>::sentry
 {
 // Data Members.
 bool 				_M_ok;
 basic_ostream<_CharT, _Traits>& 	_M_os;

public:
 /**
 * @brief The constructor performs preparatory work.
 * @param __os The output stream to guard.
 *
 * If the stream state is good (@a __os.good() is true), then if the
 * stream is tied to another output stream, @c is.tie()->flush()
 * is called to synchronize the output sequences.
 *
 * If the stream state is still good, then the sentry state becomes
 * true (@a okay).
 */
 explicit
 sentry(basic_ostream<_CharT, _Traits>& __os);

#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
      /**
       *  @brief  Possibly flushes the stream.
       *
       *  If @c ios_base::unitbuf is set in @c os.flags(), and
       *  @c std::uncaught_exception() is true, the sentry destructor calls
       *  @c flush() on the output stream.
      */
      ~sentry()
      {
	// XXX MT
	if (bool(_M_os.flags() & ios_base::unitbuf) && !uncaught_exception())
	  {
	    // Can't call flush directly or else will get into recursive lock.
	    if (_M_os.rdbuf() && _M_os.rdbuf()->pubsync() == -1)
	      _M_os.setstate(ios_base::badbit);
	  }
      }
#pragma GCC diagnostic pop

/**
       *  @brief  Quick status checking.
       *  @return  The sentry state.
       *
       *  For ease of use, sentries may be converted to booleans.  The
       *  return value is that of the sentry state (true == okay).
      */
#if __cplusplus >= 201103L
      explicit
#endif
      operator bool() const
      { return _M_ok; }
    };

//@{
 /**
 * @brief Character inserters
 * @param __out An output stream.
 * @param __c A character.
 * @return out
 *
 * Behaves like one of the formatted arithmetic inserters described in
 * std::basic_ostream. After constructing a sentry object with good
 * status, this function inserts a single character and any required
 * padding (as determined by [22.2.2.2.2]). @c __out.width(0) is then
 * called.
 *
 * If @p __c is of type @c char and the character type of the stream is not
 * @c char, the character is widened before insertion.
 */
 template<typename _CharT, typename _Traits>
 inline basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
 { return __ostream_insert(__out, &__c, 1); }

template<typename _CharT, typename _Traits>
 inline basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
 { return (__out << __out.widen(__c)); }

// Specialization
 template <class _Traits>
 inline basic_ostream<char, _Traits>&
 operator<<(basic_ostream<char, _Traits>& __out, char __c)
 { return __ostream_insert(__out, &__c, 1); }

// Signed and unsigned
 template<class _Traits>
 inline basic_ostream<char, _Traits>&
 operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
 { return (__out << static_cast<char>(__c)); }

template<class _Traits>
 inline basic_ostream<char, _Traits>&
 operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
 { return (__out << static_cast<char>(__c)); }
 //@}

//@{
 /**
 * @brief String inserters
 * @param __out An output stream.
 * @param __s A character string.
 * @return out
 * @pre @p __s must be a non-NULL pointer
 *
 * Behaves like one of the formatted arithmetic inserters described in
 * std::basic_ostream. After constructing a sentry object with good
 * status, this function inserts @c traits::length(__s) characters starting
 * at @p __s, widened if necessary, followed by any required padding (as
 * determined by [22.2.2.2.2]). @c __out.width(0) is then called.
 */
 template<typename _CharT, typename _Traits>
 inline basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
 {
 if (!__s)
	__out.setstate(ios_base::badbit);
 else
	__ostream_insert(__out, __s,
			 static_cast<streamsize>(_Traits::length(__s)));
 return __out;
 }

template<typename _CharT, typename _Traits>
 basic_ostream<_CharT, _Traits> &
 operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s);

// Partial specializations
 template<class _Traits>
 inline basic_ostream<char, _Traits>&
 operator<<(basic_ostream<char, _Traits>& __out, const char* __s)
 {
 if (!__s)
	__out.setstate(ios_base::badbit);
 else
	__ostream_insert(__out, __s,
			 static_cast<streamsize>(_Traits::length(__s)));
 return __out;
 }

// Signed and unsigned
 template<class _Traits>
 inline basic_ostream<char, _Traits>&
 operator<<(basic_ostream<char, _Traits>& __out, const signed char* __s)
 { return (__out << reinterpret_cast<const char*>(__s)); }

template<class _Traits>
 inline basic_ostream<char, _Traits> &
 operator<<(basic_ostream<char, _Traits>& __out, const unsigned char* __s)
 { return (__out << reinterpret_cast<const char*>(__s)); }
 //@}

// Standard basic_ostream manipulators

/**
 * @brief Write a newline and flush the stream.
 *
 * This manipulator is often mistakenly used when a simple newline is
 * desired, leading to poor buffering performance. See
 * https://gcc.gnu.org/onlinedocs/libstdc++/manual/streambufs.html#io.streambuf.buffering
 * for more on this subject.
 */
 template<typename _CharT, typename _Traits>
 inline basic_ostream<_CharT, _Traits>&
 endl(basic_ostream<_CharT, _Traits>& __os)
 { return flush(__os.put(__os.widen('\n'))); }

/**
 * @brief Write a null character into the output sequence.
 *
 * Null character is @c CharT() by definition. For CharT
 * of @c char, this correctly writes the ASCII @c NUL character
 * string terminator.
 */
 template<typename _CharT, typename _Traits>
 inline basic_ostream<_CharT, _Traits>&
 ends(basic_ostream<_CharT, _Traits>& __os)
 { return __os.put(_CharT()); }

/**
 * @brief Flushes the output stream.
 *
 * This manipulator simply calls the stream's @c flush() member function.
 */
 template<typename _CharT, typename _Traits>
 inline basic_ostream<_CharT, _Traits>&
 flush(basic_ostream<_CharT, _Traits>& __os)
 { return __os.flush(); }

#if __cplusplus >= 201103L
 template<typename _Ch, typename _Up>
 basic_ostream<_Ch, _Up>&
 __is_convertible_to_basic_ostream_test(basic_ostream<_Ch, _Up>*);

template<typename _Tp, typename = void>
 struct __is_convertible_to_basic_ostream_impl
 {
 using __ostream_type = void;
 };

template<typename _Tp>
 using __do_is_convertible_to_basic_ostream_impl =
 decltype(__is_convertible_to_basic_ostream_test
	 (declval<typename remove_reference<_Tp>::type*>()));

template<typename _Tp>
 struct __is_convertible_to_basic_ostream_impl
 <_Tp,
 __void_t<__do_is_convertible_to_basic_ostream_impl<_Tp>>>
 {
 using __ostream_type =
	__do_is_convertible_to_basic_ostream_impl<_Tp>;
 };

template<typename _Tp>
 struct __is_convertible_to_basic_ostream
 : __is_convertible_to_basic_ostream_impl<_Tp>
 {
 public:
 using type = __not_<is_void<
 typename __is_convertible_to_basic_ostream_impl<_Tp>::__ostream_type>>;
 constexpr static bool value = type::value;
 };

template<typename _Ostream, typename _Tp, typename = void>
 struct __is_insertable : false_type {};

template<typename _Ostream, typename _Tp>
 struct __is_insertable<_Ostream, _Tp,
			 __void_t<decltype(declval<_Ostream&>()
					 << declval<const _Tp&>())>>
				 : true_type {};

template<typename _Ostream>
 using __rvalue_ostream_type =
 typename __is_convertible_to_basic_ostream<
	_Ostream>::__ostream_type;

/**
 * @brief Generic inserter for rvalue stream
 * @param __os An input stream.
 * @param __x A reference to the object being inserted.
 * @return os
 *
 * This is just a forwarding function to allow insertion to
 * rvalue streams since they won't bind to the inserter functions
 * that take an lvalue reference.
 */
 template<typename _Ostream, typename _Tp>
 inline
 typename enable_if<__and_<__not_<is_lvalue_reference<_Ostream>>,
			 __is_convertible_to_basic_ostream<_Ostream>,
			 __is_insertable<
				__rvalue_ostream_type<_Ostream>,
				const _Tp&>>::value,
		 __rvalue_ostream_type<_Ostream>>::type
 operator<<(_Ostream&& __os, const _Tp& __x)
 {
 __rvalue_ostream_type<_Ostream> __ret_os = __os;
 __ret_os << __x;
 return __ret_os;
 }
#endif // C++11

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std

#include <bits/ostream.tcc>

#endif	/* _GLIBCXX_OSTREAM */

cmd: