Line data Source code
1 : // Output streams -*- C++ -*-
2 :
3 : // Copyright (C) 1997-2019 Free Software Foundation, Inc.
4 : //
5 : // This file is part of the GNU ISO C++ Library. This library is free
6 : // software; you can redistribute it and/or modify it under the
7 : // terms of the GNU General Public License as published by the
8 : // Free Software Foundation; either version 3, or (at your option)
9 : // any later version.
10 :
11 : // This library is distributed in the hope that it will be useful,
12 : // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 : // GNU General Public License for more details.
15 :
16 : // Under Section 7 of GPL version 3, you are granted additional
17 : // permissions described in the GCC Runtime Library Exception, version
18 : // 3.1, as published by the Free Software Foundation.
19 :
20 : // You should have received a copy of the GNU General Public License and
21 : // a copy of the GCC Runtime Library Exception along with this program;
22 : // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 : // <http://www.gnu.org/licenses/>.
24 :
25 : /** @file include/ostream
26 : * This is a Standard C++ Library header.
27 : */
28 :
29 : //
30 : // ISO C++ 14882: 27.6.2 Output streams
31 : //
32 :
33 : #ifndef _GLIBCXX_OSTREAM
34 : #define _GLIBCXX_OSTREAM 1
35 :
36 : #pragma GCC system_header
37 :
38 : #include <ios>
39 : #include <bits/ostream_insert.h>
40 :
41 : namespace std _GLIBCXX_VISIBILITY(default)
42 : {
43 : _GLIBCXX_BEGIN_NAMESPACE_VERSION
44 :
45 : /**
46 : * @brief Template class basic_ostream.
47 : * @ingroup io
48 : *
49 : * @tparam _CharT Type of character stream.
50 : * @tparam _Traits Traits for character type, defaults to
51 : * char_traits<_CharT>.
52 : *
53 : * This is the base class for all output streams. It provides text
54 : * formatting of all builtin types, and communicates with any class
55 : * derived from basic_streambuf to do the actual output.
56 : */
57 : template<typename _CharT, typename _Traits>
58 : class basic_ostream : virtual public basic_ios<_CharT, _Traits>
59 : {
60 : public:
61 : // Types (inherited from basic_ios):
62 : typedef _CharT char_type;
63 : typedef typename _Traits::int_type int_type;
64 : typedef typename _Traits::pos_type pos_type;
65 : typedef typename _Traits::off_type off_type;
66 : typedef _Traits traits_type;
67 :
68 : // Non-standard Types:
69 : typedef basic_streambuf<_CharT, _Traits> __streambuf_type;
70 : typedef basic_ios<_CharT, _Traits> __ios_type;
71 : typedef basic_ostream<_CharT, _Traits> __ostream_type;
72 : typedef num_put<_CharT, ostreambuf_iterator<_CharT, _Traits> >
73 : __num_put_type;
74 : typedef ctype<_CharT> __ctype_type;
75 :
76 : /**
77 : * @brief Base constructor.
78 : *
79 : * This ctor is almost never called by the user directly, rather from
80 : * derived classes' initialization lists, which pass a pointer to
81 : * their own stream buffer.
82 : */
83 : explicit
84 28852 : basic_ostream(__streambuf_type* __sb)
85 28852 : { this->init(__sb); }
86 :
87 : /**
88 : * @brief Base destructor.
89 : *
90 : * This does very little apart from providing a virtual base dtor.
91 : */
92 : virtual
93 28851 : ~basic_ostream() { }
94 :
95 : /// Safe prefix/suffix operations.
96 : class sentry;
97 : friend class sentry;
98 :
99 : ///@{
100 : /**
101 : * @brief Interface for manipulators.
102 : *
103 : * Manipulators such as @c std::endl and @c std::hex use these
104 : * functions in constructs like "std::cout << std::endl". For more
105 : * information, see the iomanip header.
106 : */
107 : __ostream_type&
108 1968066 : operator<<(__ostream_type& (*__pf)(__ostream_type&))
109 : {
110 : // _GLIBCXX_RESOLVE_LIB_DEFECTS
111 : // DR 60. What is a formatted input function?
112 : // The inserters for manipulators are *not* formatted output functions.
113 1968066 : return __pf(*this);
114 : }
115 :
116 : __ostream_type&
117 : operator<<(__ios_type& (*__pf)(__ios_type&))
118 : {
119 : // _GLIBCXX_RESOLVE_LIB_DEFECTS
120 : // DR 60. What is a formatted input function?
121 : // The inserters for manipulators are *not* formatted output functions.
122 : __pf(*this);
123 : return *this;
124 : }
125 :
126 : __ostream_type&
127 96383 : operator<<(ios_base& (*__pf) (ios_base&))
128 : {
129 : // _GLIBCXX_RESOLVE_LIB_DEFECTS
130 : // DR 60. What is a formatted input function?
131 : // The inserters for manipulators are *not* formatted output functions.
132 96383 : __pf(*this);
133 : return *this;
134 : }
135 : ///@}
136 :
137 : ///@{
138 : /**
139 : * @name Inserters
140 : *
141 : * All the @c operator<< functions (aka <em>formatted output
142 : * functions</em>) have some common behavior. Each starts by
143 : * constructing a temporary object of type std::basic_ostream::sentry.
144 : * This can have several effects, concluding with the setting of a
145 : * status flag; see the sentry documentation for more.
146 : *
147 : * If the sentry status is good, the function tries to generate
148 : * whatever data is appropriate for the type of the argument.
149 : *
150 : * If an exception is thrown during insertion, ios_base::badbit
151 : * will be turned on in the stream's error state without causing an
152 : * ios_base::failure to be thrown. The original exception will then
153 : * be rethrown.
154 : */
155 :
156 : ///@{
157 : /**
158 : * @brief Integer arithmetic inserters
159 : * @param __n A variable of builtin integral type.
160 : * @return @c *this if successful
161 : *
162 : * These functions use the stream's current locale (specifically, the
163 : * @c num_get facet) to perform numeric formatting.
164 : */
165 : __ostream_type&
166 70 : operator<<(long __n)
167 70 : { return _M_insert(__n); }
168 :
169 : __ostream_type&
170 12153937 : operator<<(unsigned long __n)
171 12153937 : { return _M_insert(__n); }
172 :
173 : __ostream_type&
174 106731 : operator<<(bool __n)
175 106731 : { return _M_insert(__n); }
176 :
177 : __ostream_type&
178 : operator<<(short __n);
179 :
180 : __ostream_type&
181 184 : operator<<(unsigned short __n)
182 : {
183 : // _GLIBCXX_RESOLVE_LIB_DEFECTS
184 : // 117. basic_ostream uses nonexistent num_put member functions.
185 184 : return _M_insert(static_cast<unsigned long>(__n));
186 : }
187 :
188 : __ostream_type&
189 : operator<<(int __n);
190 :
191 : __ostream_type&
192 38110 : operator<<(unsigned int __n)
193 : {
194 : // _GLIBCXX_RESOLVE_LIB_DEFECTS
195 : // 117. basic_ostream uses nonexistent num_put member functions.
196 38110 : return _M_insert(static_cast<unsigned long>(__n));
197 : }
198 :
199 : #ifdef _GLIBCXX_USE_LONG_LONG
200 : __ostream_type&
201 326 : operator<<(long long __n)
202 326 : { return _M_insert(__n); }
203 :
204 : __ostream_type&
205 1 : operator<<(unsigned long long __n)
206 1 : { return _M_insert(__n); }
207 : #endif
208 : ///@}
209 :
210 : ///@{
211 : /**
212 : * @brief Floating point arithmetic inserters
213 : * @param __f A variable of builtin floating point type.
214 : * @return @c *this if successful
215 : *
216 : * These functions use the stream's current locale (specifically, the
217 : * @c num_get facet) to perform numeric formatting.
218 : */
219 : __ostream_type&
220 37 : operator<<(double __f)
221 37 : { return _M_insert(__f); }
222 :
223 : __ostream_type&
224 1 : operator<<(float __f)
225 : {
226 : // _GLIBCXX_RESOLVE_LIB_DEFECTS
227 : // 117. basic_ostream uses nonexistent num_put member functions.
228 1 : return _M_insert(static_cast<double>(__f));
229 : }
230 :
231 : __ostream_type&
232 1 : operator<<(long double __f)
233 1 : { return _M_insert(__f); }
234 : ///@}
235 :
236 : /**
237 : * @brief Pointer arithmetic inserters
238 : * @param __p A variable of pointer type.
239 : * @return @c *this if successful
240 : *
241 : * These functions use the stream's current locale (specifically, the
242 : * @c num_get facet) to perform numeric formatting.
243 : */
244 : __ostream_type&
245 7982410 : operator<<(const void* __p)
246 7982410 : { return _M_insert(__p); }
247 :
248 : #if __cplusplus >= 201703L
249 : __ostream_type&
250 : operator<<(nullptr_t)
251 : { return *this << "nullptr"; }
252 : #endif
253 :
254 : /**
255 : * @brief Extracting from another streambuf.
256 : * @param __sb A pointer to a streambuf
257 : *
258 : * This function behaves like one of the basic arithmetic extractors,
259 : * in that it also constructs a sentry object and has the same error
260 : * handling behavior.
261 : *
262 : * If @p __sb is NULL, the stream will set failbit in its error state.
263 : *
264 : * Characters are extracted from @p __sb and inserted into @c *this
265 : * until one of the following occurs:
266 : *
267 : * - the input stream reaches end-of-file,
268 : * - insertion into the output sequence fails (in this case, the
269 : * character that would have been inserted is not extracted), or
270 : * - an exception occurs while getting a character from @p __sb, which
271 : * sets failbit in the error state
272 : *
273 : * If the function inserts no characters, failbit is set.
274 : */
275 : __ostream_type&
276 : operator<<(__streambuf_type* __sb);
277 : ///@}
278 :
279 : ///@{
280 : /**
281 : * @name Unformatted Output Functions
282 : *
283 : * All the unformatted output functions have some common behavior.
284 : * Each starts by constructing a temporary object of type
285 : * std::basic_ostream::sentry. This has several effects, concluding
286 : * with the setting of a status flag; see the sentry documentation
287 : * for more.
288 : *
289 : * If the sentry status is good, the function tries to generate
290 : * whatever data is appropriate for the type of the argument.
291 : *
292 : * If an exception is thrown during insertion, ios_base::badbit
293 : * will be turned on in the stream's error state. If badbit is on in
294 : * the stream's exceptions mask, the exception will be rethrown
295 : * without completing its actions.
296 : */
297 :
298 : /**
299 : * @brief Simple insertion.
300 : * @param __c The character to insert.
301 : * @return *this
302 : *
303 : * Tries to insert @p __c.
304 : *
305 : * @note This function is not overloaded on signed char and
306 : * unsigned char.
307 : */
308 : __ostream_type&
309 : put(char_type __c);
310 :
311 : /**
312 : * @brief Core write functionality, without sentry.
313 : * @param __s The array to insert.
314 : * @param __n Maximum number of characters to insert.
315 : */
316 : void
317 : _M_write(const char_type* __s, streamsize __n)
318 : {
319 : const streamsize __put = this->rdbuf()->sputn(__s, __n);
320 : if (__put != __n)
321 : this->setstate(ios_base::badbit);
322 : }
323 :
324 : /**
325 : * @brief Character string insertion.
326 : * @param __s The array to insert.
327 : * @param __n Maximum number of characters to insert.
328 : * @return *this
329 : *
330 : * Characters are copied from @p __s and inserted into the stream until
331 : * one of the following happens:
332 : *
333 : * - @p __n characters are inserted
334 : * - inserting into the output sequence fails (in this case, badbit
335 : * will be set in the stream's error state)
336 : *
337 : * @note This function is not overloaded on signed char and
338 : * unsigned char.
339 : */
340 : __ostream_type&
341 : write(const char_type* __s, streamsize __n);
342 : ///@}
343 :
344 : /**
345 : * @brief Synchronizing the stream buffer.
346 : * @return *this
347 : *
348 : * If @c rdbuf() is a null pointer, changes nothing.
349 : *
350 : * Otherwise, calls @c rdbuf()->pubsync(), and if that returns -1,
351 : * sets badbit.
352 : */
353 : __ostream_type&
354 : flush();
355 :
356 : /**
357 : * @brief Getting the current write position.
358 : * @return A file position object.
359 : *
360 : * If @c fail() is not false, returns @c pos_type(-1) to indicate
361 : * failure. Otherwise returns @c rdbuf()->pubseekoff(0,cur,out).
362 : */
363 : pos_type
364 : tellp();
365 :
366 : /**
367 : * @brief Changing the current write position.
368 : * @param __pos A file position object.
369 : * @return *this
370 : *
371 : * If @c fail() is not true, calls @c rdbuf()->pubseekpos(pos). If
372 : * that function fails, sets failbit.
373 : */
374 : __ostream_type&
375 : seekp(pos_type);
376 :
377 : /**
378 : * @brief Changing the current write position.
379 : * @param __off A file offset object.
380 : * @param __dir The direction in which to seek.
381 : * @return *this
382 : *
383 : * If @c fail() is not true, calls @c rdbuf()->pubseekoff(off,dir).
384 : * If that function fails, sets failbit.
385 : */
386 : __ostream_type&
387 : seekp(off_type, ios_base::seekdir);
388 :
389 : protected:
390 : basic_ostream()
391 : { this->init(0); }
392 :
393 : #if __cplusplus >= 201103L
394 : // Non-standard constructor that does not call init()
395 : basic_ostream(basic_iostream<_CharT, _Traits>&) { }
396 :
397 : basic_ostream(const basic_ostream&) = delete;
398 :
399 : basic_ostream(basic_ostream&& __rhs)
400 : : __ios_type()
401 : { __ios_type::move(__rhs); }
402 :
403 : // 27.7.3.3 Assign/swap
404 :
405 : basic_ostream& operator=(const basic_ostream&) = delete;
406 :
407 : basic_ostream&
408 : operator=(basic_ostream&& __rhs)
409 : {
410 : swap(__rhs);
411 : return *this;
412 : }
413 :
414 : void
415 : swap(basic_ostream& __rhs)
416 : { __ios_type::swap(__rhs); }
417 : #endif
418 :
419 : template<typename _ValueT>
420 : __ostream_type&
421 : _M_insert(_ValueT __v);
422 : };
423 :
424 : /**
425 : * @brief Performs setup work for output streams.
426 : *
427 : * Objects of this class are created before all of the standard
428 : * inserters are run. It is responsible for <em>exception-safe prefix and
429 : * suffix operations</em>.
430 : */
431 : template <typename _CharT, typename _Traits>
432 : class basic_ostream<_CharT, _Traits>::sentry
433 : {
434 : // Data Members.
435 : bool _M_ok;
436 : basic_ostream<_CharT, _Traits>& _M_os;
437 :
438 : public:
439 : /**
440 : * @brief The constructor performs preparatory work.
441 : * @param __os The output stream to guard.
442 : *
443 : * If the stream state is good (@a __os.good() is true), then if the
444 : * stream is tied to another output stream, @c is.tie()->flush()
445 : * is called to synchronize the output sequences.
446 : *
447 : * If the stream state is still good, then the sentry state becomes
448 : * true (@a okay).
449 : */
450 : explicit
451 : sentry(basic_ostream<_CharT, _Traits>& __os);
452 :
453 : #pragma GCC diagnostic push
454 : #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
455 : /**
456 : * @brief Possibly flushes the stream.
457 : *
458 : * If @c ios_base::unitbuf is set in @c os.flags(), and
459 : * @c std::uncaught_exception() is true, the sentry destructor calls
460 : * @c flush() on the output stream.
461 : */
462 : ~sentry()
463 : {
464 : // XXX MT
465 : if (bool(_M_os.flags() & ios_base::unitbuf) && !uncaught_exception())
466 : {
467 : // Can't call flush directly or else will get into recursive lock.
468 : if (_M_os.rdbuf() && _M_os.rdbuf()->pubsync() == -1)
469 : _M_os.setstate(ios_base::badbit);
470 : }
471 : }
472 : #pragma GCC diagnostic pop
473 :
474 : /**
475 : * @brief Quick status checking.
476 : * @return The sentry state.
477 : *
478 : * For ease of use, sentries may be converted to booleans. The
479 : * return value is that of the sentry state (true == okay).
480 : */
481 : #if __cplusplus >= 201103L
482 : explicit
483 : #endif
484 : operator bool() const
485 : { return _M_ok; }
486 : };
487 :
488 : ///@{
489 : /**
490 : * @brief Character inserters
491 : * @param __out An output stream.
492 : * @param __c A character.
493 : * @return out
494 : *
495 : * Behaves like one of the formatted arithmetic inserters described in
496 : * std::basic_ostream. After constructing a sentry object with good
497 : * status, this function inserts a single character and any required
498 : * padding (as determined by [22.2.2.2.2]). @c __out.width(0) is then
499 : * called.
500 : *
501 : * If @p __c is of type @c char and the character type of the stream is not
502 : * @c char, the character is widened before insertion.
503 : */
504 : template<typename _CharT, typename _Traits>
505 : inline basic_ostream<_CharT, _Traits>&
506 : operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
507 : { return __ostream_insert(__out, &__c, 1); }
508 :
509 : template<typename _CharT, typename _Traits>
510 : inline basic_ostream<_CharT, _Traits>&
511 : operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
512 : { return (__out << __out.widen(__c)); }
513 :
514 : // Specialization
515 : template <class _Traits>
516 : inline basic_ostream<char, _Traits>&
517 26955733 : operator<<(basic_ostream<char, _Traits>& __out, char __c)
518 26955733 : { return __ostream_insert(__out, &__c, 1); }
519 :
520 : // Signed and unsigned
521 : template<class _Traits>
522 : inline basic_ostream<char, _Traits>&
523 : operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
524 : { return (__out << static_cast<char>(__c)); }
525 :
526 : template<class _Traits>
527 : inline basic_ostream<char, _Traits>&
528 0 : operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
529 0 : { return (__out << static_cast<char>(__c)); }
530 : ///@}
531 :
532 : ///@{
533 : /**
534 : * @brief String inserters
535 : * @param __out An output stream.
536 : * @param __s A character string.
537 : * @return out
538 : * @pre @p __s must be a non-NULL pointer
539 : *
540 : * Behaves like one of the formatted arithmetic inserters described in
541 : * std::basic_ostream. After constructing a sentry object with good
542 : * status, this function inserts @c traits::length(__s) characters starting
543 : * at @p __s, widened if necessary, followed by any required padding (as
544 : * determined by [22.2.2.2.2]). @c __out.width(0) is then called.
545 : */
546 : template<typename _CharT, typename _Traits>
547 : inline basic_ostream<_CharT, _Traits>&
548 : operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
549 : {
550 : if (!__s)
551 : __out.setstate(ios_base::badbit);
552 : else
553 : __ostream_insert(__out, __s,
554 : static_cast<streamsize>(_Traits::length(__s)));
555 : return __out;
556 : }
557 :
558 : template<typename _CharT, typename _Traits>
559 : basic_ostream<_CharT, _Traits> &
560 : operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s);
561 :
562 : // Partial specializations
563 : template<class _Traits>
564 : inline basic_ostream<char, _Traits>&
565 55893041 : operator<<(basic_ostream<char, _Traits>& __out, const char* __s)
566 : {
567 : if (!__s)
568 55867153 : __out.setstate(ios_base::badbit);
569 : else
570 55919717 : __ostream_insert(__out, __s,
571 55893041 : static_cast<streamsize>(_Traits::length(__s)));
572 : return __out;
573 : }
574 :
575 : // Signed and unsigned
576 : template<class _Traits>
577 : inline basic_ostream<char, _Traits>&
578 : operator<<(basic_ostream<char, _Traits>& __out, const signed char* __s)
579 : { return (__out << reinterpret_cast<const char*>(__s)); }
580 :
581 : template<class _Traits>
582 : inline basic_ostream<char, _Traits> &
583 : operator<<(basic_ostream<char, _Traits>& __out, const unsigned char* __s)
584 : { return (__out << reinterpret_cast<const char*>(__s)); }
585 : ///@}
586 :
587 : // Standard basic_ostream manipulators
588 :
589 : /**
590 : * @brief Write a newline and flush the stream.
591 : *
592 : * This manipulator is often mistakenly used when a simple newline is
593 : * desired, leading to poor buffering performance. See
594 : * https://gcc.gnu.org/onlinedocs/libstdc++/manual/streambufs.html#io.streambuf.buffering
595 : * for more on this subject.
596 : */
597 : template<typename _CharT, typename _Traits>
598 : inline basic_ostream<_CharT, _Traits>&
599 : endl(basic_ostream<_CharT, _Traits>& __os)
600 : { return flush(__os.put(__os.widen('\n'))); }
601 :
602 : /**
603 : * @brief Write a null character into the output sequence.
604 : *
605 : * <em>Null character</em> is @c CharT() by definition. For CharT
606 : * of @c char, this correctly writes the ASCII @c NUL character
607 : * string terminator.
608 : */
609 : template<typename _CharT, typename _Traits>
610 : inline basic_ostream<_CharT, _Traits>&
611 : ends(basic_ostream<_CharT, _Traits>& __os)
612 : { return __os.put(_CharT()); }
613 :
614 : /**
615 : * @brief Flushes the output stream.
616 : *
617 : * This manipulator simply calls the stream's @c flush() member function.
618 : */
619 : template<typename _CharT, typename _Traits>
620 : inline basic_ostream<_CharT, _Traits>&
621 0 : flush(basic_ostream<_CharT, _Traits>& __os)
622 0 : { return __os.flush(); }
623 :
624 : #if __cplusplus >= 201103L
625 : template<typename _Ch, typename _Up>
626 : basic_ostream<_Ch, _Up>&
627 : __is_convertible_to_basic_ostream_test(basic_ostream<_Ch, _Up>*);
628 :
629 : template<typename _Tp, typename = void>
630 : struct __is_convertible_to_basic_ostream_impl
631 : {
632 : using __ostream_type = void;
633 : };
634 :
635 : template<typename _Tp>
636 : using __do_is_convertible_to_basic_ostream_impl =
637 : decltype(__is_convertible_to_basic_ostream_test
638 : (declval<typename remove_reference<_Tp>::type*>()));
639 :
640 : template<typename _Tp>
641 : struct __is_convertible_to_basic_ostream_impl
642 : <_Tp,
643 : __void_t<__do_is_convertible_to_basic_ostream_impl<_Tp>>>
644 : {
645 : using __ostream_type =
646 : __do_is_convertible_to_basic_ostream_impl<_Tp>;
647 : };
648 :
649 : template<typename _Tp>
650 : struct __is_convertible_to_basic_ostream
651 : : __is_convertible_to_basic_ostream_impl<_Tp>
652 : {
653 : public:
654 : using type = __not_<is_void<
655 : typename __is_convertible_to_basic_ostream_impl<_Tp>::__ostream_type>>;
656 : constexpr static bool value = type::value;
657 : };
658 :
659 : template<typename _Ostream, typename _Tp, typename = void>
660 : struct __is_insertable : false_type {};
661 :
662 : template<typename _Ostream, typename _Tp>
663 : struct __is_insertable<_Ostream, _Tp,
664 : __void_t<decltype(declval<_Ostream&>()
665 : << declval<const _Tp&>())>>
666 : : true_type {};
667 :
668 : template<typename _Ostream>
669 : using __rvalue_ostream_type =
670 : typename __is_convertible_to_basic_ostream<
671 : _Ostream>::__ostream_type;
672 :
673 : /**
674 : * @brief Generic inserter for rvalue stream
675 : * @param __os An input stream.
676 : * @param __x A reference to the object being inserted.
677 : * @return os
678 : *
679 : * This is just a forwarding function to allow insertion to
680 : * rvalue streams since they won't bind to the inserter functions
681 : * that take an lvalue reference.
682 : */
683 : template<typename _Ostream, typename _Tp>
684 : inline
685 : typename enable_if<__and_<__not_<is_lvalue_reference<_Ostream>>,
686 : __is_convertible_to_basic_ostream<_Ostream>,
687 : __is_insertable<
688 : __rvalue_ostream_type<_Ostream>,
689 : const _Tp&>>::value,
690 : __rvalue_ostream_type<_Ostream>>::type
691 : operator<<(_Ostream&& __os, const _Tp& __x)
692 : {
693 : __rvalue_ostream_type<_Ostream> __ret_os = __os;
694 : __ret_os << __x;
695 : return __ret_os;
696 : }
697 : #endif // C++11
698 :
699 : _GLIBCXX_END_NAMESPACE_VERSION
700 : } // namespace std
701 :
702 : #include <bits/ostream.tcc>
703 :
704 : #endif /* _GLIBCXX_OSTREAM */
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