1// -*- C++ -*-
2#ifndef _LIBCPP_SPLIT_BUFFER
3#define _LIBCPP_SPLIT_BUFFER
4
5#include <__config>
6#include <type_traits>
7#include <algorithm>
8
9#pragma GCC system_header
10
11_LIBCPP_BEGIN_NAMESPACE_STD
12
13template <bool>
14class __split_buffer_common
15{
16protected:
17    void __throw_length_error() const;
18    void __throw_out_of_range() const;
19};
20
21template <class _Tp, class _Allocator>
22struct __split_buffer
23    : private __split_buffer_common<true>
24{
25private:
26    __split_buffer(const __split_buffer&);
27    __split_buffer& operator=(const __split_buffer&);
28public:
29    typedef _Tp                                             value_type;
30    typedef _Allocator                                      allocator_type;
31    typedef typename remove_reference<allocator_type>::type __alloc_rr;
32    typedef allocator_traits<__alloc_rr>                    __alloc_traits;
33    typedef value_type&                                     reference;
34    typedef const value_type&                               const_reference;
35    typedef typename __alloc_traits::size_type              size_type;
36    typedef typename __alloc_traits::difference_type        difference_type;
37    typedef typename __alloc_traits::pointer                pointer;
38    typedef typename __alloc_traits::const_pointer          const_pointer;
39    typedef pointer                                         iterator;
40    typedef const_pointer                                   const_iterator;
41
42    pointer                                         __first_;
43    pointer                                         __begin_;
44    pointer                                         __end_;
45    __compressed_pair<pointer, allocator_type> __end_cap_;
46
47    typedef typename add_lvalue_reference<allocator_type>::type __alloc_ref;
48    typedef typename add_lvalue_reference<allocator_type>::type __alloc_const_ref;
49
50    _LIBCPP_INLINE_VISIBILITY __alloc_rr&           __alloc()         {return __end_cap_.second();}
51    _LIBCPP_INLINE_VISIBILITY const __alloc_rr&     __alloc() const   {return __end_cap_.second();}
52    _LIBCPP_INLINE_VISIBILITY pointer&              __end_cap()       {return __end_cap_.first();}
53    _LIBCPP_INLINE_VISIBILITY const pointer&        __end_cap() const {return __end_cap_.first();}
54
55    __split_buffer();
56    explicit __split_buffer(__alloc_rr& __a);
57    explicit __split_buffer(const __alloc_rr& __a);
58    __split_buffer(size_type __cap, size_type __start, __alloc_rr& __a);
59    ~__split_buffer();
60
61#ifdef _LIBCPP_MOVE
62    __split_buffer(__split_buffer&& __c);
63    __split_buffer(__split_buffer&& __c, const __alloc_rr& __a);
64    __split_buffer& operator=(__split_buffer&& __c);
65#endif
66
67    _LIBCPP_INLINE_VISIBILITY       iterator begin()       {return __begin_;}
68    _LIBCPP_INLINE_VISIBILITY const_iterator begin() const {return __begin_;}
69    _LIBCPP_INLINE_VISIBILITY       iterator end()         {return __end_;}
70    _LIBCPP_INLINE_VISIBILITY const_iterator end() const   {return __end_;}
71
72    _LIBCPP_INLINE_VISIBILITY void clear() {__destruct_at_end(__begin_);}
73    _LIBCPP_INLINE_VISIBILITY size_type size() const {return static_cast<size_type>(__end_ - __begin_);}
74    _LIBCPP_INLINE_VISIBILITY bool empty()     const {return __end_ == __begin_;}
75    _LIBCPP_INLINE_VISIBILITY size_type capacity() const {return static_cast<size_type>(__end_cap() - __first_);}
76    _LIBCPP_INLINE_VISIBILITY size_type __front_spare() const {return static_cast<size_type>(__begin_ - __first_);}
77    _LIBCPP_INLINE_VISIBILITY size_type __back_spare() const {return static_cast<size_type>(__end_cap() - __end_);}
78
79    _LIBCPP_INLINE_VISIBILITY       reference front()       {return *__begin_;}
80    _LIBCPP_INLINE_VISIBILITY const_reference front() const {return *__begin_;}
81    _LIBCPP_INLINE_VISIBILITY       reference back()        {return *(__end_ - 1);}
82    _LIBCPP_INLINE_VISIBILITY const_reference back() const  {return *(__end_ - 1);}
83
84    void reserve(size_type __n);
85    void shrink_to_fit();
86    void push_front(const_reference __x);
87    void push_back(const_reference __x);
88#ifdef _LIBCPP_MOVE
89    void push_front(value_type&& __x);
90    void push_back(value_type&& __x);
91    template <class... _Args>
92        void emplace_back(_Args&&... __args);
93#endif
94
95    _LIBCPP_INLINE_VISIBILITY void pop_front() {__destruct_at_begin(__begin_+1);}
96    _LIBCPP_INLINE_VISIBILITY void pop_back() {__destruct_at_end(__end_-1);}
97
98    void __construct_at_end(size_type __n);
99        void __construct_at_end(size_type __n, false_type);
100        void __construct_at_end(size_type __n, true_type);
101    void __construct_at_end(size_type __n, const_reference __x);
102        void __construct_at_end(size_type __n, const_reference __x, false_type);
103        void __construct_at_end(size_type __n, const_reference __x, true_type);
104    template <class _InputIter>
105        typename enable_if
106        <
107            __is_input_iterator<_InputIter>::value &&
108           !__is_forward_iterator<_InputIter>::value,
109            void
110        >::type
111        __construct_at_end(_InputIter __first, _InputIter __last);
112    template <class _ForwardIterator>
113        typename enable_if
114        <
115            __is_forward_iterator<_ForwardIterator>::value,
116            void
117        >::type
118        __construct_at_end(_ForwardIterator __first, _ForwardIterator __last);
119
120    _LIBCPP_INLINE_VISIBILITY void __destruct_at_begin(pointer __new_begin)
121        {__destruct_at_begin(__new_begin, has_trivial_destructor<value_type>());}
122        void __destruct_at_begin(pointer __new_begin, false_type);
123        void __destruct_at_begin(pointer __new_begin, true_type);
124
125    _LIBCPP_INLINE_VISIBILITY void __destruct_at_end(pointer __new_last)
126        {__destruct_at_end(__new_last, has_trivial_destructor<value_type>());}
127        void __destruct_at_end(pointer __new_last, false_type);
128        void __destruct_at_end(pointer __new_last, true_type);
129
130    void swap(__split_buffer& __x);
131
132    bool __invariants() const;
133
134private:
135    void __move_assign_alloc(const __split_buffer& __c, true_type)
136        {
137            __alloc() = _STD::move(__c.__alloc());
138        }
139
140    void __move_assign_alloc(const __split_buffer& __c, false_type)
141        {}
142
143    static void __swap_alloc(__alloc_rr& __x, __alloc_rr& __y)
144        {__swap_alloc(__x, __y, integral_constant<bool,
145                      __alloc_traits::propagate_on_container_swap::value>());}
146
147    static void __swap_alloc(__alloc_rr& __x, __alloc_rr& __y, true_type)
148        {
149            using _STD::swap;
150            swap(__x, __y);
151        }
152    static void __swap_alloc(__alloc_rr& __x, __alloc_rr& __y, false_type)
153        {}
154};
155
156template <class _Tp, class _Allocator>
157bool
158__split_buffer<_Tp, _Allocator>::__invariants() const
159{
160    if (__first_ == nullptr)
161    {
162        if (__begin_ != nullptr)
163            return false;
164        if (__end_ != nullptr)
165            return false;
166        if (__end_cap() != nullptr)
167            return false;
168    }
169    else
170    {
171        if (__begin_ < __first_)
172            return false;
173        if (__end_ < __begin_)
174            return false;
175        if (__end_cap() < __end_)
176            return false;
177    }
178    return true;
179}
180
181//  Default constructs __n objects starting at __end_
182//  throws if construction throws
183//  Precondition:  __n > 0
184//  Precondition:  size() + __n <= capacity()
185//  Postcondition:  size() == size() + __n
186template <class _Tp, class _Allocator>
187_LIBCPP_INLINE_VISIBILITY inline
188void
189__split_buffer<_Tp, _Allocator>::__construct_at_end(size_type __n)
190{
191    __construct_at_end(__n, __is_zero_default_constructible<value_type>());
192}
193
194template <class _Tp, class _Allocator>
195void
196__split_buffer<_Tp, _Allocator>::__construct_at_end(size_type __n, false_type)
197{
198    __alloc_rr& __a = this->__alloc();
199    do
200    {
201        __alloc_traits::construct(__a, _STD::__to_raw_pointer(this->__end_), value_type());
202        ++this->__end_;
203        --__n;
204    } while (__n > 0);
205}
206
207template <class _Tp, class _Allocator>
208_LIBCPP_INLINE_VISIBILITY inline
209void
210__split_buffer<_Tp, _Allocator>::__construct_at_end(size_type __n, true_type)
211{
212    _STD::memset(this->__end_, 0, __n*sizeof(value_type));
213    this->__end_ += __n;
214}
215
216//  Copy constructs __n objects starting at __end_ from __x
217//  throws if construction throws
218//  Precondition:  __n > 0
219//  Precondition:  size() + __n <= capacity()
220//  Postcondition:  size() == old size() + __n
221//  Postcondition:  [i] == __x for all i in [size() - __n, __n)
222template <class _Tp, class _Allocator>
223_LIBCPP_INLINE_VISIBILITY inline
224void
225__split_buffer<_Tp, _Allocator>::__construct_at_end(size_type __n, const_reference __x)
226{
227    __construct_at_end(__n, __x, integral_constant<bool, has_trivial_copy_constructor<value_type>::value &&
228                                                         has_trivial_copy_assign<value_type>::value>());
229}
230
231template <class _Tp, class _Allocator>
232void
233__split_buffer<_Tp, _Allocator>::__construct_at_end(size_type __n, const_reference __x, false_type)
234{
235    __alloc_rr& __a = this->__alloc();
236    do
237    {
238        __alloc_traits::construct(__a, _STD::__to_raw_pointer(this->__end_), __x);
239        ++this->__end_;
240        --__n;
241    } while (__n > 0);
242}
243
244template <class _Tp, class _Allocator>
245_LIBCPP_INLINE_VISIBILITY inline
246void
247__split_buffer<_Tp, _Allocator>::__construct_at_end(size_type __n, const_reference __x, true_type)
248{
249    _STD::fill_n(this->__end_, __n, __x);
250    this->__end_ += __n;
251}
252
253template <class _Tp, class _Allocator>
254template <class _InputIter>
255typename enable_if
256<
257     __is_input_iterator<_InputIter>::value &&
258    !__is_forward_iterator<_InputIter>::value,
259    void
260>::type
261__split_buffer<_Tp, _Allocator>::__construct_at_end(_InputIter __first, _InputIter __last)
262{
263    __alloc_rr& __a = this->__alloc();
264    for (; __first != __last; ++__first)
265    {
266        if (__end_ == __end_cap())
267        {
268            size_type __old_cap = __end_cap() - __first_;
269            size_type __new_cap = _STD::max<size_type>(2 * __old_cap, 8);
270            __split_buffer __buf(__new_cap, 0, __a);
271            for (pointer __p = __begin_; __p != __end_; ++__p, ++__buf.__end_)
272                __alloc_traits::construct(__buf.__alloc(),
273                        _STD::__to_raw_pointer(__buf.__end_), _STD::move(*__p));
274            swap(__buf);
275        }
276        __alloc_traits::construct(__a, _STD::__to_raw_pointer(this->__end_), *__first);
277        ++this->__end_;
278    }
279}
280
281template <class _Tp, class _Allocator>
282template <class _ForwardIterator>
283typename enable_if
284<
285    __is_forward_iterator<_ForwardIterator>::value,
286    void
287>::type
288__split_buffer<_Tp, _Allocator>::__construct_at_end(_ForwardIterator __first, _ForwardIterator __last)
289{
290    __alloc_rr& __a = this->__alloc();
291    for (; __first != __last; ++__first)
292    {
293        __alloc_traits::construct(__a, _STD::__to_raw_pointer(this->__end_), *__first);
294        ++this->__end_;
295    }
296}
297
298template <class _Tp, class _Allocator>
299_LIBCPP_INLINE_VISIBILITY inline
300void
301__split_buffer<_Tp, _Allocator>::__destruct_at_begin(pointer __new_begin, false_type)
302{
303    while (__begin_ < __new_begin)
304        __alloc_traits::destroy(__alloc(), __begin_++);
305}
306
307template <class _Tp, class _Allocator>
308_LIBCPP_INLINE_VISIBILITY inline
309void
310__split_buffer<_Tp, _Allocator>::__destruct_at_begin(pointer __new_begin, true_type)
311{
312    __begin_ = __new_begin;
313}
314
315template <class _Tp, class _Allocator>
316_LIBCPP_INLINE_VISIBILITY inline
317void
318__split_buffer<_Tp, _Allocator>::__destruct_at_end(pointer __new_last, false_type)
319{
320    while (__new_last < __end_)
321        __alloc_traits::destroy(__alloc(), --__end_);
322}
323
324template <class _Tp, class _Allocator>
325_LIBCPP_INLINE_VISIBILITY inline
326void
327__split_buffer<_Tp, _Allocator>::__destruct_at_end(pointer __new_last, true_type)
328{
329    __end_ = __new_last;
330}
331
332template <class _Tp, class _Allocator>
333__split_buffer<_Tp, _Allocator>::__split_buffer(size_type __cap, size_type __start, __alloc_rr& __a)
334    : __end_cap_(0, __a)
335{
336    __first_ = __cap != 0 ? __alloc_traits::allocate(__alloc(), __cap) : nullptr;
337    __begin_ = __end_ = __first_ + __start;
338    __end_cap() = __first_ + __cap;
339}
340
341template <class _Tp, class _Allocator>
342_LIBCPP_INLINE_VISIBILITY inline
343__split_buffer<_Tp, _Allocator>::__split_buffer()
344    : __first_(0), __begin_(0), __end_(0), __end_cap_(0)
345{
346}
347
348template <class _Tp, class _Allocator>
349_LIBCPP_INLINE_VISIBILITY inline
350__split_buffer<_Tp, _Allocator>::__split_buffer(__alloc_rr& __a)
351    : __first_(0), __begin_(0), __end_(0), __end_cap_(0, __a)
352{
353}
354
355template <class _Tp, class _Allocator>
356_LIBCPP_INLINE_VISIBILITY inline
357__split_buffer<_Tp, _Allocator>::__split_buffer(const __alloc_rr& __a)
358    : __first_(0), __begin_(0), __end_(0), __end_cap_(0, __a)
359{
360}
361
362template <class _Tp, class _Allocator>
363__split_buffer<_Tp, _Allocator>::~__split_buffer()
364{
365    clear();
366    if (__first_)
367        __alloc_traits::deallocate(__alloc(), __first_, capacity());
368}
369
370#ifdef _LIBCPP_MOVE
371
372template <class _Tp, class _Allocator>
373__split_buffer<_Tp, _Allocator>::__split_buffer(__split_buffer&& __c)
374    : __first_(_STD::move(__c.__first_)),
375      __begin_(_STD::move(__c.__begin_)),
376      __end_(_STD::move(__c.__end_)),
377      __end_cap_(_STD::move(__c.__end_cap_))
378{
379    __c.__first_ = nullptr;
380    __c.__begin_ = nullptr;
381    __c.__end_ = nullptr;
382    __c.__end_cap() = nullptr;
383}
384
385template <class _Tp, class _Allocator>
386__split_buffer<_Tp, _Allocator>::__split_buffer(__split_buffer&& __c, const __alloc_rr& __a)
387    : __end_cap_(__a)
388{
389    if (__a == __c.__alloc())
390    {
391        __first_ = __c.__first_;
392        __begin_ = __c.__begin_;
393        __end_ = __c.__end_;
394        __end_cap() = __c.__end_cap();
395        __c.__first_ = nullptr;
396        __c.__begin_ = nullptr;
397        __c.__end_ = nullptr;
398        __c.__end_cap() = nullptr;
399    }
400    else
401    {
402        size_type __cap = __c.size();
403        __first_ = __alloc_traits::allocate(__alloc(), __cap);
404        __begin_ = __end_ = __first_;
405        __end_cap() = __first_ + __cap;
406        typedef move_iterator<iterator> _I;
407        __construct_at_end(_I(__c.begin()), _I(__c.end()));
408    }
409}
410
411template <class _Tp, class _Allocator>
412__split_buffer<_Tp, _Allocator>&
413__split_buffer<_Tp, _Allocator>::operator=(__split_buffer&& __c)
414{
415    clear();
416    shrink_to_fit();
417    __first_ = __c.__first_;
418    __begin_ = __c.__begin_;
419    __end_ = __c.__end_;
420    __end_cap() = __c.__end_cap();
421    __move_assign_alloc(__c,
422        integral_constant<bool,
423                          __alloc_traits::propagate_on_container_move_assignment::value>());
424    __c.__first_ = __c.__begin_ = __c.__end_ = __c.__end_cap() = nullptr;
425    return *this;
426}
427
428#endif
429
430template <class _Tp, class _Allocator>
431void
432__split_buffer<_Tp, _Allocator>::swap(__split_buffer& __x)
433{
434    _STD::swap(__first_, __x.__first_);
435    _STD::swap(__begin_, __x.__begin_);
436    _STD::swap(__end_, __x.__end_);
437    _STD::swap(__end_cap(), __x.__end_cap());
438    __swap_alloc(__alloc(), __x.__alloc());
439}
440
441template <class _Tp, class _Allocator>
442void
443__split_buffer<_Tp, _Allocator>::reserve(size_type __n)
444{
445    if (__n < capacity())
446    {
447        __split_buffer<value_type, __alloc_rr&> __t(__n, 0, __alloc());
448        __t.__construct_at_end(move_iterator<pointer>(__begin_),
449                               move_iterator<pointer>(__end_));
450        _STD::swap(__first_, __t.__first_);
451        _STD::swap(__begin_, __t.__begin_);
452        _STD::swap(__end_, __t.__end_);
453        _STD::swap(__end_cap(), __t.__end_cap());
454    }
455}
456
457template <class _Tp, class _Allocator>
458void
459__split_buffer<_Tp, _Allocator>::shrink_to_fit()
460{
461    if (capacity() > size())
462    {
463#ifndef _LIBCPP_NO_EXCEPTIONS
464        try
465        {
466#endif
467            __split_buffer<value_type, __alloc_rr&> __t(size(), 0, __alloc());
468            __t.__construct_at_end(move_iterator<pointer>(__begin_),
469                                   move_iterator<pointer>(__end_));
470            __t.__end_ = __t.__begin_ + (__end_ - __begin_);
471            _STD::swap(__first_, __t.__first_);
472            _STD::swap(__begin_, __t.__begin_);
473            _STD::swap(__end_, __t.__end_);
474            _STD::swap(__end_cap(), __t.__end_cap());
475#ifndef _LIBCPP_NO_EXCEPTIONS
476        }
477        catch (...)
478        {
479        }
480#endif
481    }
482}
483
484template <class _Tp, class _Allocator>
485void
486__split_buffer<_Tp, _Allocator>::push_front(const_reference __x)
487{
488    if (__begin_ == __first_)
489    {
490        if (__end_ < __end_cap())
491        {
492            difference_type __d = __end_cap() - __end_;
493            __d = (__d + 1) / 2;
494            __begin_ = _STD::move_backward(__begin_, __end_, __end_ + __d);
495            __end_ += __d;
496        }
497        else
498        {
499            size_type __c = max<size_type>(2 * (__end_cap() - __first_), 1);
500            __split_buffer<value_type, __alloc_rr&> __t(__c, (__c + 2) / 4, __alloc());
501            __t.__construct_at_end(move_iterator<pointer>(__begin_),
502                                   move_iterator<pointer>(__end_));
503            _STD::swap(__first_, __t.__first_);
504            _STD::swap(__begin_, __t.__begin_);
505            _STD::swap(__end_, __t.__end_);
506            _STD::swap(__end_cap(), __t.__end_cap());
507        }
508    }
509    __alloc_traits::construct(__alloc(), _STD::__to_raw_pointer(__begin_-1), __x);
510    --__begin_;
511}
512
513#ifdef _LIBCPP_MOVE
514
515template <class _Tp, class _Allocator>
516void
517__split_buffer<_Tp, _Allocator>::push_front(value_type&& __x)
518{
519    if (__begin_ == __first_)
520    {
521        if (__end_ < __end_cap())
522        {
523            difference_type __d = __end_cap() - __end_;
524            __d = (__d + 1) / 2;
525            __begin_ = _STD::move_backward(__begin_, __end_, __end_ + __d);
526            __end_ += __d;
527        }
528        else
529        {
530            size_type __c = max<size_type>(2 * (__end_cap() - __first_), 1);
531            __split_buffer<value_type, __alloc_rr&> __t(__c, (__c + 2) / 4, __alloc());
532            __t.__construct_at_end(move_iterator<pointer>(__begin_),
533                                   move_iterator<pointer>(__end_));
534            _STD::swap(__first_, __t.__first_);
535            _STD::swap(__begin_, __t.__begin_);
536            _STD::swap(__end_, __t.__end_);
537            _STD::swap(__end_cap(), __t.__end_cap());
538        }
539    }
540    __alloc_traits::construct(__alloc(), _STD::__to_raw_pointer(__begin_-1),
541            _STD::move(__x));
542    --__begin_;
543}
544
545#endif
546
547template <class _Tp, class _Allocator>
548_LIBCPP_INLINE_VISIBILITY inline
549void
550__split_buffer<_Tp, _Allocator>::push_back(const_reference __x)
551{
552    if (__end_ == __end_cap())
553    {
554        if (__begin_ > __first_)
555        {
556            difference_type __d = __begin_ - __first_;
557            __d = (__d + 1) / 2;
558            __end_ = _STD::move(__begin_, __end_, __begin_ - __d);
559            __begin_ -= __d;
560        }
561        else
562        {
563            size_type __c = max<size_type>(2 * (__end_cap() - __first_), 1);
564            __split_buffer<value_type, __alloc_rr&> __t(__c, __c / 4, __alloc());
565            __t.__construct_at_end(move_iterator<pointer>(__begin_),
566                                   move_iterator<pointer>(__end_));
567            _STD::swap(__first_, __t.__first_);
568            _STD::swap(__begin_, __t.__begin_);
569            _STD::swap(__end_, __t.__end_);
570            _STD::swap(__end_cap(), __t.__end_cap());
571        }
572    }
573    __alloc_traits::construct(__alloc(), _STD::__to_raw_pointer(__end_), __x);
574    ++__end_;
575}
576
577#ifdef _LIBCPP_MOVE
578
579template <class _Tp, class _Allocator>
580void
581__split_buffer<_Tp, _Allocator>::push_back(value_type&& __x)
582{
583    if (__end_ == __end_cap())
584    {
585        if (__begin_ > __first_)
586        {
587            difference_type __d = __begin_ - __first_;
588            __d = (__d + 1) / 2;
589            __end_ = _STD::move(__begin_, __end_, __begin_ - __d);
590            __begin_ -= __d;
591        }
592        else
593        {
594            size_type __c = max<size_type>(2 * (__end_cap() - __first_), 1);
595            __split_buffer<value_type, __alloc_rr&> __t(__c, __c / 4, __alloc());
596            __t.__construct_at_end(move_iterator<pointer>(__begin_),
597                                   move_iterator<pointer>(__end_));
598            _STD::swap(__first_, __t.__first_);
599            _STD::swap(__begin_, __t.__begin_);
600            _STD::swap(__end_, __t.__end_);
601            _STD::swap(__end_cap(), __t.__end_cap());
602        }
603    }
604    __alloc_traits::construct(__alloc(), _STD::__to_raw_pointer(__end_),
605            _STD::move(__x));
606    ++__end_;
607}
608
609template <class _Tp, class _Allocator>
610template <class... _Args>
611void
612__split_buffer<_Tp, _Allocator>::emplace_back(_Args&&... __args)
613{
614    if (__end_ == __end_cap())
615    {
616        if (__begin_ > __first_)
617        {
618            difference_type __d = __begin_ - __first_;
619            __d = (__d + 1) / 2;
620            __end_ = _STD::move(__begin_, __end_, __begin_ - __d);
621            __begin_ -= __d;
622        }
623        else
624        {
625            size_type __c = max<size_type>(2 * (__end_cap() - __first_), 1);
626            __split_buffer<value_type, __alloc_rr&> __t(__c, __c / 4, __alloc());
627            __t.__construct_at_end(move_iterator<pointer>(__begin_),
628                                   move_iterator<pointer>(__end_));
629            _STD::swap(__first_, __t.__first_);
630            _STD::swap(__begin_, __t.__begin_);
631            _STD::swap(__end_, __t.__end_);
632            _STD::swap(__end_cap(), __t.__end_cap());
633        }
634    }
635    __alloc_traits::construct(__alloc(), _STD::__to_raw_pointer(__end_),
636                              _STD::forward<_Args>(__args)...);
637    ++__end_;
638}
639
640#endif
641
642_LIBCPP_END_NAMESPACE_STD
643
644#endif  // _LIBCPP_SPLIT_BUFFER
645