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1138 lines
37 KiB
C++
1138 lines
37 KiB
C++
// Copyright Thorsten Ottosen, 2009.
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_SIGNALS2_DETAIL_AUTO_BUFFER_HPP_25_02_2009
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#define BOOST_SIGNALS2_DETAIL_AUTO_BUFFER_HPP_25_02_2009
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#include <boost/detail/workaround.hpp>
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#if defined(_MSC_VER)
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# pragma once
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#endif
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#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
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#pragma warning(push)
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#pragma warning(disable:4996)
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#endif
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#include <boost/assert.hpp>
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#include <boost/iterator/reverse_iterator.hpp>
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#include <boost/iterator/iterator_traits.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/multi_index/detail/scope_guard.hpp>
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#include <boost/swap.hpp>
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#include <boost/type_traits/aligned_storage.hpp>
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#include <boost/type_traits/alignment_of.hpp>
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#include <boost/type_traits/has_nothrow_copy.hpp>
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#include <boost/type_traits/has_nothrow_assign.hpp>
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#include <boost/type_traits/has_trivial_assign.hpp>
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#include <boost/type_traits/has_trivial_constructor.hpp>
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#include <boost/type_traits/has_trivial_destructor.hpp>
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#include <algorithm>
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#include <cstring>
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#include <iterator>
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#include <memory>
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#include <stdexcept>
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namespace boost
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{
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namespace signals2
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{
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namespace detail
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{
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//
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// Policies for creating the stack buffer.
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//
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template< unsigned N >
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struct store_n_objects
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{
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BOOST_STATIC_CONSTANT( unsigned, value = N );
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};
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template< unsigned N >
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struct store_n_bytes
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{
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BOOST_STATIC_CONSTANT( unsigned, value = N );
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};
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namespace auto_buffer_detail
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{
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template< class Policy, class T >
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struct compute_buffer_size
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{
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BOOST_STATIC_CONSTANT( unsigned, value = Policy::value * sizeof(T) );
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};
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template< unsigned N, class T >
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struct compute_buffer_size< store_n_bytes<N>, T >
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{
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BOOST_STATIC_CONSTANT( unsigned, value = N );
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};
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template< class Policy, class T >
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struct compute_buffer_objects
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{
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BOOST_STATIC_CONSTANT( unsigned, value = Policy::value );
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};
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template< unsigned N, class T >
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struct compute_buffer_objects< store_n_bytes<N>, T >
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{
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BOOST_STATIC_CONSTANT( unsigned, value = N / sizeof(T) );
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};
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}
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struct default_grow_policy
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{
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template< class SizeType >
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static SizeType new_capacity( SizeType capacity )
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{
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//
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// @remark: we grow the capacity quite agressively.
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// this is justified since we aim to minimize
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// heap-allocations, and because we mostly use
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// the buffer locally.
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return capacity * 4u;
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}
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template< class SizeType >
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static bool should_shrink( SizeType, SizeType )
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{
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//
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// @remark: when defining a new grow policy, one might
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// choose that if the waated space is less
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// than a certain percentage, then it is of
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// little use to shrink.
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//
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return true;
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}
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};
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template< class T,
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class StackBufferPolicy = store_n_objects<256>,
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class GrowPolicy = default_grow_policy,
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class Allocator = std::allocator<T> >
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class auto_buffer;
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template
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<
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class T,
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class StackBufferPolicy,
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class GrowPolicy,
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class Allocator
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>
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class auto_buffer : Allocator
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{
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private:
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enum { N = auto_buffer_detail::
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compute_buffer_objects<StackBufferPolicy,T>::value };
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BOOST_STATIC_CONSTANT( bool, is_stack_buffer_empty = N == 0u );
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typedef auto_buffer<T, store_n_objects<0>, GrowPolicy, Allocator>
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local_buffer;
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public:
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typedef Allocator allocator_type;
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typedef T value_type;
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typedef typename Allocator::size_type size_type;
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typedef typename Allocator::difference_type difference_type;
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typedef T* pointer;
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typedef typename Allocator::pointer allocator_pointer;
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typedef const T* const_pointer;
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typedef T& reference;
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typedef const T& const_reference;
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typedef pointer iterator;
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typedef const_pointer const_iterator;
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typedef boost::reverse_iterator<iterator> reverse_iterator;
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typedef boost::reverse_iterator<const_iterator> const_reverse_iterator;
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typedef typename boost::mpl::if_c< boost::has_trivial_assign<T>::value
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&& sizeof(T) <= sizeof(long double),
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const value_type,
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const_reference >::type
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optimized_const_reference;
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private:
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pointer allocate( size_type capacity_arg )
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{
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if( capacity_arg > N )
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return &*get_allocator().allocate( capacity_arg );
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else
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return static_cast<T*>( members_.address() );
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}
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void deallocate( pointer where, size_type capacity_arg )
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{
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if( capacity_arg <= N )
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return;
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get_allocator().deallocate( allocator_pointer(where), capacity_arg );
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}
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template< class I >
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static void copy_impl( I begin, I end, pointer where, std::random_access_iterator_tag )
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{
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copy_rai( begin, end, where, boost::has_trivial_assign<T>() );
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}
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static void copy_rai( const T* begin, const T* end,
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pointer where, const boost::true_type& )
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{
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std::memcpy( where, begin, sizeof(T) * std::distance(begin,end) );
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}
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template< class I, bool b >
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static void copy_rai( I begin, I end,
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pointer where, const boost::integral_constant<bool, b>& )
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{
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std::uninitialized_copy( begin, end, where );
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}
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template< class I >
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static void copy_impl( I begin, I end, pointer where, std::bidirectional_iterator_tag )
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{
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std::uninitialized_copy( begin, end, where );
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}
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template< class I >
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static void copy_impl( I begin, I end, pointer where )
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{
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copy_impl( begin, end, where,
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typename std::iterator_traits<I>::iterator_category() );
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}
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template< class I, class I2 >
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static void assign_impl( I begin, I end, I2 where )
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{
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assign_impl( begin, end, where, boost::has_trivial_assign<T>() );
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}
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template< class I, class I2 >
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static void assign_impl( I begin, I end, I2 where, const boost::true_type& )
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{
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std::memcpy( where, begin, sizeof(T) * std::distance(begin,end) );
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}
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template< class I, class I2 >
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static void assign_impl( I begin, I end, I2 where, const boost::false_type& )
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{
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for( ; begin != end; ++begin, ++where )
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*where = *begin;
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}
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void unchecked_push_back_n( size_type n, const boost::true_type& )
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{
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std::uninitialized_fill( end(), end() + n, T() );
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size_ += n;
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}
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void unchecked_push_back_n( size_type n, const boost::false_type& )
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{
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for( size_type i = 0u; i < n; ++i )
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unchecked_push_back();
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}
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void auto_buffer_destroy( pointer where, const boost::false_type& )
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{
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(*where).~T();
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}
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void auto_buffer_destroy( pointer, const boost::true_type& )
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{ }
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void auto_buffer_destroy( pointer where )
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{
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auto_buffer_destroy( where, boost::has_trivial_destructor<T>() );
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}
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void destroy_back_n( size_type n, const boost::false_type& )
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{
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BOOST_ASSERT( n > 0 );
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pointer buffer = buffer_ + size_ - 1u;
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pointer new_end = buffer - n;
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for( ; buffer > new_end; --buffer )
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auto_buffer_destroy( buffer );
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}
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void destroy_back_n( size_type, const boost::true_type& )
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{ }
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void destroy_back_n( size_type n )
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{
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destroy_back_n( n, boost::has_trivial_destructor<T>() );
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}
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void auto_buffer_destroy( const boost::false_type& x )
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{
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if( size_ )
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destroy_back_n( size_, x );
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deallocate( buffer_, members_.capacity_ );
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}
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void auto_buffer_destroy( const boost::true_type& )
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{
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deallocate( buffer_, members_.capacity_ );
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}
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pointer move_to_new_buffer( size_type new_capacity, const boost::false_type& )
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{
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pointer new_buffer = allocate( new_capacity ); // strong
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boost::multi_index::detail::scope_guard guard =
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boost::multi_index::detail::make_obj_guard( *this,
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&auto_buffer::deallocate,
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new_buffer,
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new_capacity );
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copy_impl( begin(), end(), new_buffer ); // strong
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guard.dismiss(); // nothrow
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return new_buffer;
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}
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pointer move_to_new_buffer( size_type new_capacity, const boost::true_type& )
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{
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pointer new_buffer = allocate( new_capacity ); // strong
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copy_impl( begin(), end(), new_buffer ); // nothrow
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return new_buffer;
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}
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void reserve_impl( size_type new_capacity )
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{
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pointer new_buffer = move_to_new_buffer( new_capacity,
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boost::has_nothrow_copy<T>() );
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(*this).~auto_buffer();
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buffer_ = new_buffer;
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members_.capacity_ = new_capacity;
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BOOST_ASSERT( size_ <= members_.capacity_ );
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}
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size_type new_capacity_impl( size_type n )
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{
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BOOST_ASSERT( n > members_.capacity_ );
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size_type new_capacity = GrowPolicy::new_capacity( members_.capacity_ );
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// @todo: consider to check for allocator.max_size()
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return (std::max)(new_capacity,n);
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}
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static void swap_helper( auto_buffer& l, auto_buffer& r,
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const boost::true_type& )
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{
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BOOST_ASSERT( l.is_on_stack() && r.is_on_stack() );
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auto_buffer temp( l.begin(), l.end() );
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assign_impl( r.begin(), r.end(), l.begin() );
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assign_impl( temp.begin(), temp.end(), r.begin() );
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boost::swap( l.size_, r.size_ );
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boost::swap( l.members_.capacity_, r.members_.capacity_ );
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}
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static void swap_helper( auto_buffer& l, auto_buffer& r,
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const boost::false_type& )
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{
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BOOST_ASSERT( l.is_on_stack() && r.is_on_stack() );
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size_type min_size = (std::min)(l.size_,r.size_);
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size_type max_size = (std::max)(l.size_,r.size_);
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size_type diff = max_size - min_size;
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auto_buffer* smallest = l.size_ == min_size ? &l : &r;
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auto_buffer* largest = smallest == &l ? &r : &l;
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// @remark: the implementation below is not as fast
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// as it could be if we assumed T had a default
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// constructor.
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size_type i = 0u;
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for( ; i < min_size; ++i )
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boost::swap( (*smallest)[i], (*largest)[i] );
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for( ; i < max_size; ++i )
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smallest->unchecked_push_back( (*largest)[i] );
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largest->pop_back_n( diff );
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boost::swap( l.members_.capacity_, r.members_.capacity_ );
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}
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void one_sided_swap( auto_buffer& temp ) // nothrow
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{
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BOOST_ASSERT( !temp.is_on_stack() );
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this->~auto_buffer();
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// @remark: must be nothrow
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get_allocator() = temp.get_allocator();
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members_.capacity_ = temp.members_.capacity_;
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buffer_ = temp.buffer_;
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BOOST_ASSERT( temp.size_ >= size_ + 1u );
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size_ = temp.size_;
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temp.buffer_ = 0;
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BOOST_ASSERT( temp.is_valid() );
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}
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template< class I >
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void insert_impl( const_iterator before, I begin_arg, I end_arg,
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std::input_iterator_tag )
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{
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for( ; begin_arg != end_arg; ++begin_arg )
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{
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before = insert( before, *begin_arg );
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++before;
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}
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}
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void grow_back( size_type n, const boost::true_type& )
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{
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BOOST_ASSERT( size_ + n <= members_.capacity_ );
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size_ += n;
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}
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void grow_back( size_type n, const boost::false_type& )
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{
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unchecked_push_back_n(n);
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}
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void grow_back( size_type n )
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{
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grow_back( n, boost::has_trivial_constructor<T>() );
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}
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void grow_back_one( const boost::true_type& )
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{
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BOOST_ASSERT( size_ + 1 <= members_.capacity_ );
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size_ += 1;
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}
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void grow_back_one( const boost::false_type& )
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{
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unchecked_push_back();
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}
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void grow_back_one()
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{
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grow_back_one( boost::has_trivial_constructor<T>() );
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}
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template< class I >
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void insert_impl( const_iterator before, I begin_arg, I end_arg,
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std::forward_iterator_tag )
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{
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difference_type n = std::distance(begin_arg, end_arg);
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if( size_ + n <= members_.capacity_ )
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{
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bool is_back_insertion = before == cend();
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if( !is_back_insertion )
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{
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grow_back( n );
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iterator where = const_cast<T*>(before);
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std::copy( before, cend() - n, where + n );
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assign_impl( begin_arg, end_arg, where );
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}
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else
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{
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unchecked_push_back( begin_arg, end_arg );
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}
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BOOST_ASSERT( is_valid() );
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return;
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}
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auto_buffer temp( new_capacity_impl( size_ + n ) );
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temp.unchecked_push_back( cbegin(), before );
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temp.unchecked_push_back( begin_arg, end_arg );
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temp.unchecked_push_back( before, cend() );
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one_sided_swap( temp );
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BOOST_ASSERT( is_valid() );
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}
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public:
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bool is_valid() const // invariant
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{
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// @remark: allowed for N==0 and when
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// using a locally instance
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// in insert()/one_sided_swap()
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if( buffer_ == 0 )
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return true;
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if( members_.capacity_ < N )
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return false;
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if( !is_on_stack() && members_.capacity_ <= N )
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return false;
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if( buffer_ == members_.address() )
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if( members_.capacity_ > N )
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return false;
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if( size_ > members_.capacity_ )
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return false;
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return true;
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}
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auto_buffer()
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: members_( N ),
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buffer_( static_cast<T*>(members_.address()) ),
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size_( 0u )
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{
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BOOST_ASSERT( is_valid() );
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}
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auto_buffer( const auto_buffer& r )
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: members_( (std::max)(r.size_,size_type(N)) ),
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buffer_( allocate( members_.capacity_ ) ),
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size_( 0 )
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{
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copy_impl( r.begin(), r.end(), buffer_ );
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size_ = r.size_;
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BOOST_ASSERT( is_valid() );
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}
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auto_buffer& operator=( const auto_buffer& r ) // basic
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{
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if( this == &r )
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return *this;
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difference_type diff = size_ - r.size_;
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if( diff >= 0 )
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{
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pop_back_n( static_cast<size_type>(diff) );
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assign_impl( r.begin(), r.end(), begin() );
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}
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else
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{
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if( members_.capacity_ >= r.size() )
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{
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unchecked_push_back_n( static_cast<size_type>(-diff) );
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assign_impl( r.begin(), r.end(), begin() );
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}
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else
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{
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// @remark: we release memory as early as possible
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// since we only give the basic guarantee
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(*this).~auto_buffer();
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buffer_ = 0;
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pointer new_buffer = allocate( r.size() );
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boost::multi_index::detail::scope_guard guard =
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boost::multi_index::detail::make_obj_guard( *this,
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&auto_buffer::deallocate,
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new_buffer,
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r.size() );
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copy_impl( r.begin(), r.end(), new_buffer );
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guard.dismiss();
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buffer_ = new_buffer;
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members_.capacity_ = r.size();
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size_ = members_.capacity_;
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}
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}
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BOOST_ASSERT( size() == r.size() );
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BOOST_ASSERT( is_valid() );
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return *this;
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}
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explicit auto_buffer( size_type capacity_arg )
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: members_( (std::max)(capacity_arg, size_type(N)) ),
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buffer_( allocate(members_.capacity_) ),
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size_( 0 )
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{
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BOOST_ASSERT( is_valid() );
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}
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auto_buffer( size_type size_arg, optimized_const_reference init_value )
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: members_( (std::max)(size_arg, size_type(N)) ),
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buffer_( allocate(members_.capacity_) ),
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size_( 0 )
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{
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|
std::uninitialized_fill( buffer_, buffer_ + size_arg, init_value );
|
|
size_ = size_arg;
|
|
BOOST_ASSERT( is_valid() );
|
|
}
|
|
|
|
auto_buffer( size_type capacity_arg, const allocator_type& a )
|
|
: allocator_type( a ),
|
|
members_( (std::max)(capacity_arg, size_type(N)) ),
|
|
buffer_( allocate(members_.capacity_) ),
|
|
size_( 0 )
|
|
{
|
|
BOOST_ASSERT( is_valid() );
|
|
}
|
|
|
|
auto_buffer( size_type size_arg, optimized_const_reference init_value,
|
|
const allocator_type& a )
|
|
: allocator_type( a ),
|
|
members_( (std::max)(size_arg, size_type(N)) ),
|
|
buffer_( allocate(members_.capacity_) ),
|
|
size_( 0 )
|
|
{
|
|
std::uninitialized_fill( buffer_, buffer_ + size_arg, init_value );
|
|
size_ = size_arg;
|
|
BOOST_ASSERT( is_valid() );
|
|
}
|
|
|
|
template< class ForwardIterator >
|
|
auto_buffer( ForwardIterator begin_arg, ForwardIterator end_arg )
|
|
:
|
|
members_( std::distance(begin_arg, end_arg) ),
|
|
buffer_( allocate(members_.capacity_) ),
|
|
size_( 0 )
|
|
{
|
|
copy_impl( begin_arg, end_arg, buffer_ );
|
|
size_ = members_.capacity_;
|
|
if( members_.capacity_ < N )
|
|
members_.capacity_ = N;
|
|
BOOST_ASSERT( is_valid() );
|
|
}
|
|
|
|
template< class ForwardIterator >
|
|
auto_buffer( ForwardIterator begin_arg, ForwardIterator end_arg,
|
|
const allocator_type& a )
|
|
: allocator_type( a ),
|
|
members_( std::distance(begin_arg, end_arg) ),
|
|
buffer_( allocate(members_.capacity_) ),
|
|
size_( 0 )
|
|
{
|
|
copy_impl( begin_arg, end_arg, buffer_ );
|
|
size_ = members_.capacity_;
|
|
if( members_.capacity_ < N )
|
|
members_.capacity_ = N;
|
|
BOOST_ASSERT( is_valid() );
|
|
}
|
|
|
|
~auto_buffer()
|
|
{
|
|
BOOST_ASSERT( is_valid() );
|
|
if( buffer_ ) // do we need this check? Yes, but only
|
|
// for N = 0u + local instances in one_sided_swap()
|
|
auto_buffer_destroy( boost::has_trivial_destructor<T>() );
|
|
}
|
|
|
|
public:
|
|
bool empty() const
|
|
{
|
|
return size_ == 0;
|
|
}
|
|
|
|
bool full() const
|
|
{
|
|
return size_ == members_.capacity_;
|
|
}
|
|
|
|
bool is_on_stack() const
|
|
{
|
|
return members_.capacity_ <= N;
|
|
}
|
|
|
|
size_type size() const
|
|
{
|
|
return size_;
|
|
}
|
|
|
|
size_type capacity() const
|
|
{
|
|
return members_.capacity_;
|
|
}
|
|
|
|
public:
|
|
pointer data()
|
|
{
|
|
return buffer_;
|
|
}
|
|
|
|
const_pointer data() const
|
|
{
|
|
return buffer_;
|
|
}
|
|
|
|
allocator_type& get_allocator()
|
|
{
|
|
return static_cast<allocator_type&>(*this);
|
|
}
|
|
|
|
const allocator_type& get_allocator() const
|
|
{
|
|
return static_cast<const allocator_type&>(*this);
|
|
}
|
|
|
|
public:
|
|
iterator begin()
|
|
{
|
|
return buffer_;
|
|
}
|
|
|
|
const_iterator begin() const
|
|
{
|
|
return buffer_;
|
|
}
|
|
|
|
iterator end()
|
|
{
|
|
return buffer_ + size_;
|
|
}
|
|
|
|
const_iterator end() const
|
|
{
|
|
return buffer_ + size_;
|
|
}
|
|
|
|
reverse_iterator rbegin()
|
|
{
|
|
return reverse_iterator(end());
|
|
}
|
|
|
|
const_reverse_iterator rbegin() const
|
|
{
|
|
return const_reverse_iterator(end());
|
|
}
|
|
|
|
reverse_iterator rend()
|
|
{
|
|
return reverse_iterator(begin());
|
|
}
|
|
|
|
const_reverse_iterator rend() const
|
|
{
|
|
return const_reverse_iterator(begin());
|
|
}
|
|
|
|
const_iterator cbegin() const
|
|
{
|
|
return const_cast<const auto_buffer*>(this)->begin();
|
|
}
|
|
|
|
const_iterator cend() const
|
|
{
|
|
return const_cast<const auto_buffer*>(this)->end();
|
|
}
|
|
|
|
const_reverse_iterator crbegin() const
|
|
{
|
|
return const_cast<const auto_buffer*>(this)->rbegin();
|
|
}
|
|
|
|
const_reverse_iterator crend() const
|
|
{
|
|
return const_cast<const auto_buffer*>(this)->rend();
|
|
}
|
|
|
|
public:
|
|
reference front()
|
|
{
|
|
return buffer_[0];
|
|
}
|
|
|
|
optimized_const_reference front() const
|
|
{
|
|
return buffer_[0];
|
|
}
|
|
|
|
reference back()
|
|
{
|
|
return buffer_[size_-1];
|
|
}
|
|
|
|
optimized_const_reference back() const
|
|
{
|
|
return buffer_[size_-1];
|
|
}
|
|
|
|
reference operator[]( size_type n )
|
|
{
|
|
BOOST_ASSERT( n < size_ );
|
|
return buffer_[n];
|
|
}
|
|
|
|
optimized_const_reference operator[]( size_type n ) const
|
|
{
|
|
BOOST_ASSERT( n < size_ );
|
|
return buffer_[n];
|
|
}
|
|
|
|
void unchecked_push_back()
|
|
{
|
|
BOOST_ASSERT( !full() );
|
|
new (buffer_ + size_) T;
|
|
++size_;
|
|
}
|
|
|
|
void unchecked_push_back_n( size_type n )
|
|
{
|
|
BOOST_ASSERT( size_ + n <= members_.capacity_ );
|
|
unchecked_push_back_n( n, boost::has_trivial_assign<T>() );
|
|
}
|
|
|
|
void unchecked_push_back( optimized_const_reference x ) // non-growing
|
|
{
|
|
BOOST_ASSERT( !full() );
|
|
new (buffer_ + size_) T( x );
|
|
++size_;
|
|
}
|
|
|
|
template< class ForwardIterator >
|
|
void unchecked_push_back( ForwardIterator begin_arg,
|
|
ForwardIterator end_arg ) // non-growing
|
|
{
|
|
BOOST_ASSERT( size_ + std::distance(begin_arg, end_arg) <= members_.capacity_ );
|
|
copy_impl( begin_arg, end_arg, buffer_ + size_ );
|
|
size_ += std::distance(begin_arg, end_arg);
|
|
}
|
|
|
|
void reserve_precisely( size_type n )
|
|
{
|
|
BOOST_ASSERT( members_.capacity_ >= N );
|
|
|
|
if( n <= members_.capacity_ )
|
|
return;
|
|
reserve_impl( n );
|
|
BOOST_ASSERT( members_.capacity_ == n );
|
|
}
|
|
|
|
void reserve( size_type n ) // strong
|
|
{
|
|
BOOST_ASSERT( members_.capacity_ >= N );
|
|
|
|
if( n <= members_.capacity_ )
|
|
return;
|
|
|
|
reserve_impl( new_capacity_impl( n ) );
|
|
BOOST_ASSERT( members_.capacity_ >= n );
|
|
}
|
|
|
|
void push_back()
|
|
{
|
|
if( size_ != members_.capacity_ )
|
|
{
|
|
unchecked_push_back();
|
|
}
|
|
else
|
|
{
|
|
reserve( size_ + 1u );
|
|
unchecked_push_back();
|
|
}
|
|
}
|
|
|
|
void push_back( optimized_const_reference x )
|
|
{
|
|
if( size_ != members_.capacity_ )
|
|
{
|
|
unchecked_push_back( x );
|
|
}
|
|
else
|
|
{
|
|
reserve( size_ + 1u );
|
|
unchecked_push_back( x );
|
|
}
|
|
}
|
|
|
|
template< class ForwardIterator >
|
|
void push_back( ForwardIterator begin_arg, ForwardIterator end_arg )
|
|
{
|
|
difference_type diff = std::distance(begin_arg, end_arg);
|
|
if( size_ + diff > members_.capacity_ )
|
|
reserve( size_ + diff );
|
|
unchecked_push_back( begin_arg, end_arg );
|
|
}
|
|
|
|
iterator insert( const_iterator before, optimized_const_reference x ) // basic
|
|
{
|
|
// @todo: consider if we want to support x in 'this'
|
|
if( size_ < members_.capacity_ )
|
|
{
|
|
bool is_back_insertion = before == cend();
|
|
iterator where = const_cast<T*>(before);
|
|
|
|
if( !is_back_insertion )
|
|
{
|
|
grow_back_one();
|
|
std::copy( before, cend() - 1u, where + 1u );
|
|
*where = x;
|
|
BOOST_ASSERT( is_valid() );
|
|
}
|
|
else
|
|
{
|
|
unchecked_push_back( x );
|
|
}
|
|
return where;
|
|
}
|
|
|
|
auto_buffer temp( new_capacity_impl( size_ + 1u ) );
|
|
temp.unchecked_push_back( cbegin(), before );
|
|
iterator result = temp.end();
|
|
temp.unchecked_push_back( x );
|
|
temp.unchecked_push_back( before, cend() );
|
|
one_sided_swap( temp );
|
|
BOOST_ASSERT( is_valid() );
|
|
return result;
|
|
}
|
|
|
|
void insert( const_iterator before, size_type n,
|
|
optimized_const_reference x )
|
|
{
|
|
// @todo: see problems above
|
|
if( size_ + n <= members_.capacity_ )
|
|
{
|
|
grow_back( n );
|
|
iterator where = const_cast<T*>(before);
|
|
std::copy( before, cend() - n, where + n );
|
|
std::fill( where, where + n, x );
|
|
BOOST_ASSERT( is_valid() );
|
|
return;
|
|
}
|
|
|
|
auto_buffer temp( new_capacity_impl( size_ + n ) );
|
|
temp.unchecked_push_back( cbegin(), before );
|
|
std::uninitialized_fill_n( temp.end(), n, x );
|
|
temp.size_ += n;
|
|
temp.unchecked_push_back( before, cend() );
|
|
one_sided_swap( temp );
|
|
BOOST_ASSERT( is_valid() );
|
|
}
|
|
|
|
template< class ForwardIterator >
|
|
void insert( const_iterator before,
|
|
ForwardIterator begin_arg, ForwardIterator end_arg ) // basic
|
|
{
|
|
typedef typename std::iterator_traits<ForwardIterator>
|
|
::iterator_category category;
|
|
insert_impl( before, begin_arg, end_arg, category() );
|
|
}
|
|
|
|
void pop_back()
|
|
{
|
|
BOOST_ASSERT( !empty() );
|
|
auto_buffer_destroy( buffer_ + size_ - 1, boost::has_trivial_destructor<T>() );
|
|
--size_;
|
|
}
|
|
|
|
void pop_back_n( size_type n )
|
|
{
|
|
BOOST_ASSERT( n <= size_ );
|
|
if( n )
|
|
{
|
|
destroy_back_n( n );
|
|
size_ -= n;
|
|
}
|
|
}
|
|
|
|
void clear()
|
|
{
|
|
pop_back_n( size_ );
|
|
}
|
|
|
|
iterator erase( const_iterator where )
|
|
{
|
|
BOOST_ASSERT( !empty() );
|
|
BOOST_ASSERT( cbegin() <= where );
|
|
BOOST_ASSERT( cend() > where );
|
|
|
|
unsigned elements = cend() - where - 1u;
|
|
|
|
if( elements > 0u )
|
|
{
|
|
const_iterator start = where + 1u;
|
|
std::copy( start, start + elements,
|
|
const_cast<T*>(where) );
|
|
}
|
|
pop_back();
|
|
BOOST_ASSERT( !full() );
|
|
iterator result = const_cast<T*>( where );
|
|
BOOST_ASSERT( result <= end() );
|
|
return result;
|
|
}
|
|
|
|
iterator erase( const_iterator from, const_iterator to )
|
|
{
|
|
BOOST_ASSERT( !(std::distance(from,to)>0) ||
|
|
!empty() );
|
|
BOOST_ASSERT( cbegin() <= from );
|
|
BOOST_ASSERT( cend() >= to );
|
|
|
|
unsigned elements = std::distance(to,cend());
|
|
|
|
if( elements > 0u )
|
|
{
|
|
BOOST_ASSERT( elements > 0u );
|
|
std::copy( to, to + elements,
|
|
const_cast<T*>(from) );
|
|
}
|
|
pop_back_n( std::distance(from,to) );
|
|
BOOST_ASSERT( !full() );
|
|
iterator result = const_cast<T*>( from );
|
|
BOOST_ASSERT( result <= end() );
|
|
return result;
|
|
}
|
|
|
|
void shrink_to_fit()
|
|
{
|
|
if( is_on_stack() || !GrowPolicy::should_shrink(size_,members_.capacity_) )
|
|
return;
|
|
|
|
reserve_impl( size_ );
|
|
members_.capacity_ = (std::max)(size_type(N),members_.capacity_);
|
|
BOOST_ASSERT( is_on_stack() || size_ == members_.capacity_ );
|
|
BOOST_ASSERT( !is_on_stack() || size_ <= members_.capacity_ );
|
|
}
|
|
|
|
pointer uninitialized_grow( size_type n ) // strong
|
|
{
|
|
if( size_ + n <= members_.capacity_ )
|
|
reserve( size_ + n );
|
|
|
|
pointer res = end();
|
|
size_ += n;
|
|
return res;
|
|
}
|
|
|
|
void uninitialized_shrink( size_type n ) // nothrow
|
|
{
|
|
// @remark: test for wrap-around
|
|
BOOST_ASSERT( size_ - n <= members_.capacity_ );
|
|
size_ -= n;
|
|
}
|
|
|
|
void uninitialized_resize( size_type n )
|
|
{
|
|
if( n > size() )
|
|
uninitialized_grow( n - size() );
|
|
else if( n < size() )
|
|
uninitialized_shrink( size() - n );
|
|
|
|
BOOST_ASSERT( size() == n );
|
|
}
|
|
|
|
// nothrow - if both buffer are on the heap, or
|
|
// - if one buffer is on the heap and one has
|
|
// 'has_allocated_buffer() == false', or
|
|
// - if copy-construction cannot throw
|
|
// basic - otherwise (better guarantee impossible)
|
|
// requirement: the allocator must be no-throw-swappable
|
|
void swap( auto_buffer& r )
|
|
{
|
|
bool on_stack = is_on_stack();
|
|
bool r_on_stack = r.is_on_stack();
|
|
bool both_on_heap = !on_stack && !r_on_stack;
|
|
if( both_on_heap )
|
|
{
|
|
boost::swap( get_allocator(), r.get_allocator() );
|
|
boost::swap( members_.capacity_, r.members_.capacity_ );
|
|
boost::swap( buffer_, r.buffer_ );
|
|
boost::swap( size_, r.size_ );
|
|
BOOST_ASSERT( is_valid() );
|
|
BOOST_ASSERT( r.is_valid() );
|
|
return;
|
|
}
|
|
|
|
BOOST_ASSERT( on_stack || r_on_stack );
|
|
bool exactly_one_on_stack = (on_stack && !r_on_stack) ||
|
|
(!on_stack && r_on_stack);
|
|
|
|
//
|
|
// Remark: we now know that we can copy into
|
|
// the unused stack buffer.
|
|
//
|
|
if( exactly_one_on_stack )
|
|
{
|
|
auto_buffer* one_on_stack = on_stack ? this : &r;
|
|
auto_buffer* other = on_stack ? &r : this;
|
|
pointer new_buffer = static_cast<T*>(other->members_.address());
|
|
copy_impl( one_on_stack->begin(), one_on_stack->end(),
|
|
new_buffer ); // strong
|
|
one_on_stack->~auto_buffer(); // nothrow
|
|
boost::swap( get_allocator(), r.get_allocator() ); // assume nothrow
|
|
boost::swap( members_.capacity_, r.members_.capacity_ );
|
|
boost::swap( size_, r.size_ );
|
|
one_on_stack->buffer_ = other->buffer_;
|
|
other->buffer_ = new_buffer;
|
|
BOOST_ASSERT( other->is_on_stack() );
|
|
BOOST_ASSERT( !one_on_stack->is_on_stack() );
|
|
BOOST_ASSERT( is_valid() );
|
|
BOOST_ASSERT( r.is_valid() );
|
|
return;
|
|
}
|
|
|
|
BOOST_ASSERT( on_stack && r_on_stack );
|
|
swap_helper( *this, r, boost::has_trivial_assign<T>() );
|
|
BOOST_ASSERT( is_valid() );
|
|
BOOST_ASSERT( r.is_valid() );
|
|
}
|
|
|
|
private:
|
|
typedef boost::aligned_storage< N * sizeof(T),
|
|
boost::alignment_of<T>::value >
|
|
storage;
|
|
|
|
struct members_type : storage /* to enable EBO */
|
|
{
|
|
size_type capacity_;
|
|
|
|
members_type( size_type capacity )
|
|
: capacity_(capacity)
|
|
{ }
|
|
|
|
void* address() const
|
|
{ return const_cast<storage&>(static_cast<const storage&>(*this)).address(); }
|
|
};
|
|
|
|
members_type members_;
|
|
pointer buffer_;
|
|
size_type size_;
|
|
|
|
};
|
|
|
|
template< class T, class SBP, class GP, class A >
|
|
inline void swap( auto_buffer<T,SBP,GP,A>& l, auto_buffer<T,SBP,GP,A>& r )
|
|
{
|
|
l.swap( r );
|
|
}
|
|
|
|
template< class T, class SBP, class GP, class A >
|
|
inline bool operator==( const auto_buffer<T,SBP,GP,A>& l,
|
|
const auto_buffer<T,SBP,GP,A>& r )
|
|
{
|
|
if( l.size() != r.size() )
|
|
return false;
|
|
return std::equal( l.begin(), l.end(), r.begin() );
|
|
}
|
|
|
|
template< class T, class SBP, class GP, class A >
|
|
inline bool operator!=( const auto_buffer<T,SBP,GP,A>& l,
|
|
const auto_buffer<T,SBP,GP,A>& r )
|
|
{
|
|
return !(l == r);
|
|
}
|
|
|
|
template< class T, class SBP, class GP, class A >
|
|
inline bool operator<( const auto_buffer<T,SBP,GP,A>& l,
|
|
const auto_buffer<T,SBP,GP,A>& r )
|
|
{
|
|
return std::lexicographical_compare( l.begin(), l.end(),
|
|
r.begin(), r.end() );
|
|
}
|
|
|
|
template< class T, class SBP, class GP, class A >
|
|
inline bool operator>( const auto_buffer<T,SBP,GP,A>& l,
|
|
const auto_buffer<T,SBP,GP,A>& r )
|
|
{
|
|
return (r < l);
|
|
}
|
|
|
|
template< class T, class SBP, class GP, class A >
|
|
inline bool operator<=( const auto_buffer<T,SBP,GP,A>& l,
|
|
const auto_buffer<T,SBP,GP,A>& r )
|
|
{
|
|
return !(r > l);
|
|
}
|
|
|
|
template< class T, class SBP, class GP, class A >
|
|
inline bool operator>=( const auto_buffer<T,SBP,GP,A>& l,
|
|
const auto_buffer<T,SBP,GP,A>& r )
|
|
{
|
|
return !(l < r);
|
|
}
|
|
|
|
} // namespace detail
|
|
} // namespace signals2
|
|
}
|
|
|
|
#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
|
|
#pragma warning(pop)
|
|
#endif
|
|
|
|
#endif
|