ec3773c2da
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@145624 91177308-0d34-0410-b5e6-96231b3b80d8
653 lines
22 KiB
C++
653 lines
22 KiB
C++
// -*- C++ -*-
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#ifndef _LIBCPP_SPLIT_BUFFER
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#define _LIBCPP_SPLIT_BUFFER
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#include <__config>
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#include <type_traits>
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#include <algorithm>
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#include <__undef_min_max>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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#pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <bool>
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class __split_buffer_common
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{
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protected:
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void __throw_length_error() const;
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void __throw_out_of_range() const;
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};
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template <class _Tp, class _Allocator = allocator<_Tp> >
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struct __split_buffer
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: private __split_buffer_common<true>
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{
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private:
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__split_buffer(const __split_buffer&);
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__split_buffer& operator=(const __split_buffer&);
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public:
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typedef _Tp value_type;
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typedef _Allocator allocator_type;
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typedef typename remove_reference<allocator_type>::type __alloc_rr;
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typedef allocator_traits<__alloc_rr> __alloc_traits;
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typedef value_type& reference;
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typedef const value_type& const_reference;
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typedef typename __alloc_traits::size_type size_type;
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typedef typename __alloc_traits::difference_type difference_type;
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typedef typename __alloc_traits::pointer pointer;
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typedef typename __alloc_traits::const_pointer const_pointer;
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typedef pointer iterator;
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typedef const_pointer const_iterator;
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pointer __first_;
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pointer __begin_;
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pointer __end_;
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__compressed_pair<pointer, allocator_type> __end_cap_;
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typedef typename add_lvalue_reference<allocator_type>::type __alloc_ref;
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typedef typename add_lvalue_reference<allocator_type>::type __alloc_const_ref;
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_LIBCPP_INLINE_VISIBILITY __alloc_rr& __alloc() _NOEXCEPT {return __end_cap_.second();}
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_LIBCPP_INLINE_VISIBILITY const __alloc_rr& __alloc() const _NOEXCEPT {return __end_cap_.second();}
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_LIBCPP_INLINE_VISIBILITY pointer& __end_cap() _NOEXCEPT {return __end_cap_.first();}
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_LIBCPP_INLINE_VISIBILITY const pointer& __end_cap() const _NOEXCEPT {return __end_cap_.first();}
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__split_buffer()
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_NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value);
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explicit __split_buffer(__alloc_rr& __a);
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explicit __split_buffer(const __alloc_rr& __a);
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__split_buffer(size_type __cap, size_type __start, __alloc_rr& __a);
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~__split_buffer();
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#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
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__split_buffer(__split_buffer&& __c)
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_NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value);
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__split_buffer(__split_buffer&& __c, const __alloc_rr& __a);
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__split_buffer& operator=(__split_buffer&& __c)
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_NOEXCEPT_((__alloc_traits::propagate_on_container_move_assignment::value &&
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is_nothrow_move_assignable<allocator_type>::value) ||
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!__alloc_traits::propagate_on_container_move_assignment::value);
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#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
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_LIBCPP_INLINE_VISIBILITY iterator begin() _NOEXCEPT {return __begin_;}
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_LIBCPP_INLINE_VISIBILITY const_iterator begin() const _NOEXCEPT {return __begin_;}
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_LIBCPP_INLINE_VISIBILITY iterator end() _NOEXCEPT {return __end_;}
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_LIBCPP_INLINE_VISIBILITY const_iterator end() const _NOEXCEPT {return __end_;}
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_LIBCPP_INLINE_VISIBILITY
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void clear() _NOEXCEPT
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{__destruct_at_end(__begin_);}
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_LIBCPP_INLINE_VISIBILITY size_type size() const {return static_cast<size_type>(__end_ - __begin_);}
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_LIBCPP_INLINE_VISIBILITY bool empty() const {return __end_ == __begin_;}
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_LIBCPP_INLINE_VISIBILITY size_type capacity() const {return static_cast<size_type>(__end_cap() - __first_);}
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_LIBCPP_INLINE_VISIBILITY size_type __front_spare() const {return static_cast<size_type>(__begin_ - __first_);}
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_LIBCPP_INLINE_VISIBILITY size_type __back_spare() const {return static_cast<size_type>(__end_cap() - __end_);}
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_LIBCPP_INLINE_VISIBILITY reference front() {return *__begin_;}
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_LIBCPP_INLINE_VISIBILITY const_reference front() const {return *__begin_;}
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_LIBCPP_INLINE_VISIBILITY reference back() {return *(__end_ - 1);}
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_LIBCPP_INLINE_VISIBILITY const_reference back() const {return *(__end_ - 1);}
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void reserve(size_type __n);
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void shrink_to_fit() _NOEXCEPT;
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void push_front(const_reference __x);
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void push_back(const_reference __x);
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#if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
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void push_front(value_type&& __x);
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void push_back(value_type&& __x);
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#if !defined(_LIBCPP_HAS_NO_VARIADICS)
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template <class... _Args>
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void emplace_back(_Args&&... __args);
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#endif // !defined(_LIBCPP_HAS_NO_VARIADICS)
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#endif // !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
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_LIBCPP_INLINE_VISIBILITY void pop_front() {__destruct_at_begin(__begin_+1);}
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_LIBCPP_INLINE_VISIBILITY void pop_back() {__destruct_at_end(__end_-1);}
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void __construct_at_end(size_type __n);
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void __construct_at_end(size_type __n, const_reference __x);
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template <class _InputIter>
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typename enable_if
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<
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__is_input_iterator<_InputIter>::value &&
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!__is_forward_iterator<_InputIter>::value,
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void
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>::type
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__construct_at_end(_InputIter __first, _InputIter __last);
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template <class _ForwardIterator>
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typename enable_if
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<
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__is_forward_iterator<_ForwardIterator>::value,
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void
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>::type
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__construct_at_end(_ForwardIterator __first, _ForwardIterator __last);
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_LIBCPP_INLINE_VISIBILITY void __destruct_at_begin(pointer __new_begin)
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{__destruct_at_begin(__new_begin, is_trivially_destructible<value_type>());}
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void __destruct_at_begin(pointer __new_begin, false_type);
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void __destruct_at_begin(pointer __new_begin, true_type);
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_LIBCPP_INLINE_VISIBILITY
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void __destruct_at_end(pointer __new_last) _NOEXCEPT
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{__destruct_at_end(__new_last, is_trivially_destructible<value_type>());}
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void __destruct_at_end(pointer __new_last, false_type) _NOEXCEPT;
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void __destruct_at_end(pointer __new_last, true_type) _NOEXCEPT;
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void swap(__split_buffer& __x)
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_NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value||
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__is_nothrow_swappable<__alloc_rr>::value);
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bool __invariants() const;
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private:
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_LIBCPP_INLINE_VISIBILITY
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void __move_assign_alloc(__split_buffer& __c, true_type)
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_NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value)
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{
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__alloc() = _VSTD::move(__c.__alloc());
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}
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_LIBCPP_INLINE_VISIBILITY
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void __move_assign_alloc(__split_buffer&, false_type) _NOEXCEPT
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{}
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_LIBCPP_INLINE_VISIBILITY
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static void __swap_alloc(__alloc_rr& __x, __alloc_rr& __y)
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_NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value||
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__is_nothrow_swappable<__alloc_rr>::value)
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{__swap_alloc(__x, __y, integral_constant<bool,
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__alloc_traits::propagate_on_container_swap::value>());}
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_LIBCPP_INLINE_VISIBILITY
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static void __swap_alloc(__alloc_rr& __x, __alloc_rr& __y, true_type)
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_NOEXCEPT_(__is_nothrow_swappable<__alloc_rr>::value)
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{
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using _VSTD::swap;
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swap(__x, __y);
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}
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_LIBCPP_INLINE_VISIBILITY
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static void __swap_alloc(__alloc_rr&, __alloc_rr&, false_type) _NOEXCEPT
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{}
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};
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template <class _Tp, class _Allocator>
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bool
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__split_buffer<_Tp, _Allocator>::__invariants() const
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{
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if (__first_ == nullptr)
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{
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if (__begin_ != nullptr)
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return false;
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if (__end_ != nullptr)
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return false;
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if (__end_cap() != nullptr)
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return false;
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}
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else
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{
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if (__begin_ < __first_)
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return false;
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if (__end_ < __begin_)
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return false;
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if (__end_cap() < __end_)
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return false;
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}
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return true;
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}
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// Default constructs __n objects starting at __end_
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// throws if construction throws
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// Precondition: __n > 0
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// Precondition: size() + __n <= capacity()
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// Postcondition: size() == size() + __n
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template <class _Tp, class _Allocator>
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void
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__split_buffer<_Tp, _Allocator>::__construct_at_end(size_type __n)
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{
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__alloc_rr& __a = this->__alloc();
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do
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{
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__alloc_traits::construct(__a, _VSTD::__to_raw_pointer(this->__end_));
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++this->__end_;
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--__n;
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} while (__n > 0);
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}
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// Copy constructs __n objects starting at __end_ from __x
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// throws if construction throws
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// Precondition: __n > 0
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// Precondition: size() + __n <= capacity()
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// Postcondition: size() == old size() + __n
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// Postcondition: [i] == __x for all i in [size() - __n, __n)
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template <class _Tp, class _Allocator>
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void
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__split_buffer<_Tp, _Allocator>::__construct_at_end(size_type __n, const_reference __x)
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{
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__alloc_rr& __a = this->__alloc();
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do
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{
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__alloc_traits::construct(__a, _VSTD::__to_raw_pointer(this->__end_), __x);
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++this->__end_;
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--__n;
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} while (__n > 0);
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}
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template <class _Tp, class _Allocator>
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template <class _InputIter>
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typename enable_if
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<
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__is_input_iterator<_InputIter>::value &&
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!__is_forward_iterator<_InputIter>::value,
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void
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>::type
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__split_buffer<_Tp, _Allocator>::__construct_at_end(_InputIter __first, _InputIter __last)
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{
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__alloc_rr& __a = this->__alloc();
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for (; __first != __last; ++__first)
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{
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if (__end_ == __end_cap())
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{
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size_type __old_cap = __end_cap() - __first_;
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size_type __new_cap = _VSTD::max<size_type>(2 * __old_cap, 8);
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__split_buffer __buf(__new_cap, 0, __a);
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for (pointer __p = __begin_; __p != __end_; ++__p, ++__buf.__end_)
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__alloc_traits::construct(__buf.__alloc(),
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_VSTD::__to_raw_pointer(__buf.__end_), _VSTD::move(*__p));
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swap(__buf);
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}
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__alloc_traits::construct(__a, _VSTD::__to_raw_pointer(this->__end_), *__first);
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++this->__end_;
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}
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}
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template <class _Tp, class _Allocator>
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template <class _ForwardIterator>
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typename enable_if
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<
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__is_forward_iterator<_ForwardIterator>::value,
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void
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>::type
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__split_buffer<_Tp, _Allocator>::__construct_at_end(_ForwardIterator __first, _ForwardIterator __last)
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{
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__alloc_rr& __a = this->__alloc();
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for (; __first != __last; ++__first)
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{
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__alloc_traits::construct(__a, _VSTD::__to_raw_pointer(this->__end_), *__first);
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++this->__end_;
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}
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}
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template <class _Tp, class _Allocator>
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_LIBCPP_INLINE_VISIBILITY inline
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void
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__split_buffer<_Tp, _Allocator>::__destruct_at_begin(pointer __new_begin, false_type)
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{
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while (__begin_ < __new_begin)
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__alloc_traits::destroy(__alloc(), __begin_++);
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}
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template <class _Tp, class _Allocator>
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_LIBCPP_INLINE_VISIBILITY inline
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void
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__split_buffer<_Tp, _Allocator>::__destruct_at_begin(pointer __new_begin, true_type)
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{
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__begin_ = __new_begin;
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}
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template <class _Tp, class _Allocator>
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_LIBCPP_INLINE_VISIBILITY inline
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void
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__split_buffer<_Tp, _Allocator>::__destruct_at_end(pointer __new_last, false_type) _NOEXCEPT
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{
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while (__new_last < __end_)
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__alloc_traits::destroy(__alloc(), --__end_);
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}
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template <class _Tp, class _Allocator>
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_LIBCPP_INLINE_VISIBILITY inline
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void
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__split_buffer<_Tp, _Allocator>::__destruct_at_end(pointer __new_last, true_type) _NOEXCEPT
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{
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__end_ = __new_last;
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}
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template <class _Tp, class _Allocator>
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__split_buffer<_Tp, _Allocator>::__split_buffer(size_type __cap, size_type __start, __alloc_rr& __a)
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: __end_cap_(0, __a)
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{
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__first_ = __cap != 0 ? __alloc_traits::allocate(__alloc(), __cap) : nullptr;
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__begin_ = __end_ = __first_ + __start;
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__end_cap() = __first_ + __cap;
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}
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template <class _Tp, class _Allocator>
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_LIBCPP_INLINE_VISIBILITY inline
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__split_buffer<_Tp, _Allocator>::__split_buffer()
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_NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
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: __first_(0), __begin_(0), __end_(0), __end_cap_(0)
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{
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}
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template <class _Tp, class _Allocator>
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_LIBCPP_INLINE_VISIBILITY inline
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__split_buffer<_Tp, _Allocator>::__split_buffer(__alloc_rr& __a)
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: __first_(0), __begin_(0), __end_(0), __end_cap_(0, __a)
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{
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}
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template <class _Tp, class _Allocator>
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_LIBCPP_INLINE_VISIBILITY inline
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__split_buffer<_Tp, _Allocator>::__split_buffer(const __alloc_rr& __a)
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: __first_(0), __begin_(0), __end_(0), __end_cap_(0, __a)
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{
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}
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template <class _Tp, class _Allocator>
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__split_buffer<_Tp, _Allocator>::~__split_buffer()
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{
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clear();
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if (__first_)
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__alloc_traits::deallocate(__alloc(), __first_, capacity());
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}
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#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
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template <class _Tp, class _Allocator>
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__split_buffer<_Tp, _Allocator>::__split_buffer(__split_buffer&& __c)
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_NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value)
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: __first_(_VSTD::move(__c.__first_)),
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__begin_(_VSTD::move(__c.__begin_)),
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__end_(_VSTD::move(__c.__end_)),
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__end_cap_(_VSTD::move(__c.__end_cap_))
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{
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__c.__first_ = nullptr;
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__c.__begin_ = nullptr;
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__c.__end_ = nullptr;
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__c.__end_cap() = nullptr;
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}
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template <class _Tp, class _Allocator>
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__split_buffer<_Tp, _Allocator>::__split_buffer(__split_buffer&& __c, const __alloc_rr& __a)
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: __end_cap_(__a)
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{
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if (__a == __c.__alloc())
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{
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__first_ = __c.__first_;
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__begin_ = __c.__begin_;
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__end_ = __c.__end_;
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__end_cap() = __c.__end_cap();
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__c.__first_ = nullptr;
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__c.__begin_ = nullptr;
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__c.__end_ = nullptr;
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__c.__end_cap() = nullptr;
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}
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else
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{
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size_type __cap = __c.size();
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__first_ = __alloc_traits::allocate(__alloc(), __cap);
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__begin_ = __end_ = __first_;
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__end_cap() = __first_ + __cap;
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typedef move_iterator<iterator> _Ip;
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__construct_at_end(_Ip(__c.begin()), _Ip(__c.end()));
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}
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}
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template <class _Tp, class _Allocator>
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__split_buffer<_Tp, _Allocator>&
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__split_buffer<_Tp, _Allocator>::operator=(__split_buffer&& __c)
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_NOEXCEPT_((__alloc_traits::propagate_on_container_move_assignment::value &&
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is_nothrow_move_assignable<allocator_type>::value) ||
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!__alloc_traits::propagate_on_container_move_assignment::value)
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{
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clear();
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shrink_to_fit();
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__first_ = __c.__first_;
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__begin_ = __c.__begin_;
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__end_ = __c.__end_;
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__end_cap() = __c.__end_cap();
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__move_assign_alloc(__c,
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integral_constant<bool,
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__alloc_traits::propagate_on_container_move_assignment::value>());
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__c.__first_ = __c.__begin_ = __c.__end_ = __c.__end_cap() = nullptr;
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return *this;
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}
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#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
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template <class _Tp, class _Allocator>
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void
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__split_buffer<_Tp, _Allocator>::swap(__split_buffer& __x)
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_NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value||
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__is_nothrow_swappable<__alloc_rr>::value)
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{
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_VSTD::swap(__first_, __x.__first_);
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_VSTD::swap(__begin_, __x.__begin_);
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_VSTD::swap(__end_, __x.__end_);
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_VSTD::swap(__end_cap(), __x.__end_cap());
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__swap_alloc(__alloc(), __x.__alloc());
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}
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template <class _Tp, class _Allocator>
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void
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__split_buffer<_Tp, _Allocator>::reserve(size_type __n)
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{
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if (__n < capacity())
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{
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__split_buffer<value_type, __alloc_rr&> __t(__n, 0, __alloc());
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__t.__construct_at_end(move_iterator<pointer>(__begin_),
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move_iterator<pointer>(__end_));
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_VSTD::swap(__first_, __t.__first_);
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_VSTD::swap(__begin_, __t.__begin_);
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_VSTD::swap(__end_, __t.__end_);
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_VSTD::swap(__end_cap(), __t.__end_cap());
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}
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}
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template <class _Tp, class _Allocator>
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void
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__split_buffer<_Tp, _Allocator>::shrink_to_fit() _NOEXCEPT
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{
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if (capacity() > size())
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{
|
|
#ifndef _LIBCPP_NO_EXCEPTIONS
|
|
try
|
|
{
|
|
#endif // _LIBCPP_NO_EXCEPTIONS
|
|
__split_buffer<value_type, __alloc_rr&> __t(size(), 0, __alloc());
|
|
__t.__construct_at_end(move_iterator<pointer>(__begin_),
|
|
move_iterator<pointer>(__end_));
|
|
__t.__end_ = __t.__begin_ + (__end_ - __begin_);
|
|
_VSTD::swap(__first_, __t.__first_);
|
|
_VSTD::swap(__begin_, __t.__begin_);
|
|
_VSTD::swap(__end_, __t.__end_);
|
|
_VSTD::swap(__end_cap(), __t.__end_cap());
|
|
#ifndef _LIBCPP_NO_EXCEPTIONS
|
|
}
|
|
catch (...)
|
|
{
|
|
}
|
|
#endif // _LIBCPP_NO_EXCEPTIONS
|
|
}
|
|
}
|
|
|
|
template <class _Tp, class _Allocator>
|
|
void
|
|
__split_buffer<_Tp, _Allocator>::push_front(const_reference __x)
|
|
{
|
|
if (__begin_ == __first_)
|
|
{
|
|
if (__end_ < __end_cap())
|
|
{
|
|
difference_type __d = __end_cap() - __end_;
|
|
__d = (__d + 1) / 2;
|
|
__begin_ = _VSTD::move_backward(__begin_, __end_, __end_ + __d);
|
|
__end_ += __d;
|
|
}
|
|
else
|
|
{
|
|
size_type __c = max<size_type>(2 * static_cast<size_t>(__end_cap() - __first_), 1);
|
|
__split_buffer<value_type, __alloc_rr&> __t(__c, (__c + 3) / 4, __alloc());
|
|
__t.__construct_at_end(move_iterator<pointer>(__begin_),
|
|
move_iterator<pointer>(__end_));
|
|
_VSTD::swap(__first_, __t.__first_);
|
|
_VSTD::swap(__begin_, __t.__begin_);
|
|
_VSTD::swap(__end_, __t.__end_);
|
|
_VSTD::swap(__end_cap(), __t.__end_cap());
|
|
}
|
|
}
|
|
__alloc_traits::construct(__alloc(), _VSTD::__to_raw_pointer(__begin_-1), __x);
|
|
--__begin_;
|
|
}
|
|
|
|
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
|
|
|
|
template <class _Tp, class _Allocator>
|
|
void
|
|
__split_buffer<_Tp, _Allocator>::push_front(value_type&& __x)
|
|
{
|
|
if (__begin_ == __first_)
|
|
{
|
|
if (__end_ < __end_cap())
|
|
{
|
|
difference_type __d = __end_cap() - __end_;
|
|
__d = (__d + 1) / 2;
|
|
__begin_ = _VSTD::move_backward(__begin_, __end_, __end_ + __d);
|
|
__end_ += __d;
|
|
}
|
|
else
|
|
{
|
|
size_type __c = max<size_type>(2 * static_cast<size_t>(__end_cap() - __first_), 1);
|
|
__split_buffer<value_type, __alloc_rr&> __t(__c, (__c + 3) / 4, __alloc());
|
|
__t.__construct_at_end(move_iterator<pointer>(__begin_),
|
|
move_iterator<pointer>(__end_));
|
|
_VSTD::swap(__first_, __t.__first_);
|
|
_VSTD::swap(__begin_, __t.__begin_);
|
|
_VSTD::swap(__end_, __t.__end_);
|
|
_VSTD::swap(__end_cap(), __t.__end_cap());
|
|
}
|
|
}
|
|
__alloc_traits::construct(__alloc(), _VSTD::__to_raw_pointer(__begin_-1),
|
|
_VSTD::move(__x));
|
|
--__begin_;
|
|
}
|
|
|
|
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
|
|
|
|
template <class _Tp, class _Allocator>
|
|
_LIBCPP_INLINE_VISIBILITY inline
|
|
void
|
|
__split_buffer<_Tp, _Allocator>::push_back(const_reference __x)
|
|
{
|
|
if (__end_ == __end_cap())
|
|
{
|
|
if (__begin_ > __first_)
|
|
{
|
|
difference_type __d = __begin_ - __first_;
|
|
__d = (__d + 1) / 2;
|
|
__end_ = _VSTD::move(__begin_, __end_, __begin_ - __d);
|
|
__begin_ -= __d;
|
|
}
|
|
else
|
|
{
|
|
size_type __c = max<size_type>(2 * static_cast<size_t>(__end_cap() - __first_), 1);
|
|
__split_buffer<value_type, __alloc_rr&> __t(__c, __c / 4, __alloc());
|
|
__t.__construct_at_end(move_iterator<pointer>(__begin_),
|
|
move_iterator<pointer>(__end_));
|
|
_VSTD::swap(__first_, __t.__first_);
|
|
_VSTD::swap(__begin_, __t.__begin_);
|
|
_VSTD::swap(__end_, __t.__end_);
|
|
_VSTD::swap(__end_cap(), __t.__end_cap());
|
|
}
|
|
}
|
|
__alloc_traits::construct(__alloc(), _VSTD::__to_raw_pointer(__end_), __x);
|
|
++__end_;
|
|
}
|
|
|
|
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
|
|
|
|
template <class _Tp, class _Allocator>
|
|
void
|
|
__split_buffer<_Tp, _Allocator>::push_back(value_type&& __x)
|
|
{
|
|
if (__end_ == __end_cap())
|
|
{
|
|
if (__begin_ > __first_)
|
|
{
|
|
difference_type __d = __begin_ - __first_;
|
|
__d = (__d + 1) / 2;
|
|
__end_ = _VSTD::move(__begin_, __end_, __begin_ - __d);
|
|
__begin_ -= __d;
|
|
}
|
|
else
|
|
{
|
|
size_type __c = max<size_type>(2 * static_cast<size_t>(__end_cap() - __first_), 1);
|
|
__split_buffer<value_type, __alloc_rr&> __t(__c, __c / 4, __alloc());
|
|
__t.__construct_at_end(move_iterator<pointer>(__begin_),
|
|
move_iterator<pointer>(__end_));
|
|
_VSTD::swap(__first_, __t.__first_);
|
|
_VSTD::swap(__begin_, __t.__begin_);
|
|
_VSTD::swap(__end_, __t.__end_);
|
|
_VSTD::swap(__end_cap(), __t.__end_cap());
|
|
}
|
|
}
|
|
__alloc_traits::construct(__alloc(), _VSTD::__to_raw_pointer(__end_),
|
|
_VSTD::move(__x));
|
|
++__end_;
|
|
}
|
|
|
|
#ifndef _LIBCPP_HAS_NO_VARIADICS
|
|
|
|
template <class _Tp, class _Allocator>
|
|
template <class... _Args>
|
|
void
|
|
__split_buffer<_Tp, _Allocator>::emplace_back(_Args&&... __args)
|
|
{
|
|
if (__end_ == __end_cap())
|
|
{
|
|
if (__begin_ > __first_)
|
|
{
|
|
difference_type __d = __begin_ - __first_;
|
|
__d = (__d + 1) / 2;
|
|
__end_ = _VSTD::move(__begin_, __end_, __begin_ - __d);
|
|
__begin_ -= __d;
|
|
}
|
|
else
|
|
{
|
|
size_type __c = max<size_type>(2 * static_cast<size_t>(__end_cap() - __first_), 1);
|
|
__split_buffer<value_type, __alloc_rr&> __t(__c, __c / 4, __alloc());
|
|
__t.__construct_at_end(move_iterator<pointer>(__begin_),
|
|
move_iterator<pointer>(__end_));
|
|
_VSTD::swap(__first_, __t.__first_);
|
|
_VSTD::swap(__begin_, __t.__begin_);
|
|
_VSTD::swap(__end_, __t.__end_);
|
|
_VSTD::swap(__end_cap(), __t.__end_cap());
|
|
}
|
|
}
|
|
__alloc_traits::construct(__alloc(), _VSTD::__to_raw_pointer(__end_),
|
|
_VSTD::forward<_Args>(__args)...);
|
|
++__end_;
|
|
}
|
|
|
|
#endif // _LIBCPP_HAS_NO_VARIADICS
|
|
|
|
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
|
|
|
|
template <class _Tp, class _Allocator>
|
|
_LIBCPP_INLINE_VISIBILITY inline
|
|
void
|
|
swap(__split_buffer<_Tp, _Allocator>& __x, __split_buffer<_Tp, _Allocator>& __y)
|
|
_NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
|
|
{
|
|
__x.swap(__y);
|
|
}
|
|
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
#endif // _LIBCPP_SPLIT_BUFFER
|