291 lines
7.4 KiB
C++
291 lines
7.4 KiB
C++
#ifndef BOOST_SMART_PTR_SHARED_ARRAY_HPP_INCLUDED
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#define BOOST_SMART_PTR_SHARED_ARRAY_HPP_INCLUDED
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//
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// shared_array.hpp
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//
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// (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
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// Copyright (c) 2001, 2002, 2012 Peter Dimov
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//
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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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//
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// See http://www.boost.org/libs/smart_ptr/shared_array.htm for documentation.
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//
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#include <boost/config.hpp> // for broken compiler workarounds
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#if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES)
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#include <boost/smart_ptr/detail/shared_array_nmt.hpp>
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#else
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#include <memory> // TR1 cyclic inclusion fix
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#include <boost/assert.hpp>
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#include <boost/checked_delete.hpp>
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#include <boost/smart_ptr/shared_ptr.hpp>
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#include <boost/smart_ptr/detail/shared_count.hpp>
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#include <boost/smart_ptr/detail/sp_nullptr_t.hpp>
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#include <boost/detail/workaround.hpp>
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#include <cstddef> // for std::ptrdiff_t
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#include <algorithm> // for std::swap
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#include <functional> // for std::less
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namespace boost
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{
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//
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// shared_array
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//
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// shared_array extends shared_ptr to arrays.
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// The array pointed to is deleted when the last shared_array pointing to it
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// is destroyed or reset.
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//
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template<class T> class shared_array
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{
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private:
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// Borland 5.5.1 specific workarounds
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typedef checked_array_deleter<T> deleter;
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typedef shared_array<T> this_type;
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public:
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typedef T element_type;
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shared_array() BOOST_NOEXCEPT : px( 0 ), pn()
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{
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}
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template<class Y>
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explicit shared_array( Y * p ): px( p ), pn( p, checked_array_deleter<Y>() )
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{
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boost::detail::sp_assert_convertible< Y[], T[] >();
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}
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//
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// Requirements: D's copy constructor must not throw
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//
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// shared_array will release p by calling d(p)
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//
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template<class Y, class D> shared_array( Y * p, D d ): px( p ), pn( p, d )
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{
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boost::detail::sp_assert_convertible< Y[], T[] >();
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}
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// As above, but with allocator. A's copy constructor shall not throw.
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template<class Y, class D, class A> shared_array( Y * p, D d, A a ): px( p ), pn( p, d, a )
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{
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boost::detail::sp_assert_convertible< Y[], T[] >();
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}
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// generated copy constructor, destructor are fine...
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#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
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// ... except in C++0x, move disables the implicit copy
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shared_array( shared_array const & r ) BOOST_NOEXCEPT : px( r.px ), pn( r.pn )
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{
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}
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shared_array( shared_array && r ) BOOST_NOEXCEPT : px( r.px ), pn()
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{
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pn.swap( r.pn );
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r.px = 0;
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}
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#endif
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// conversion
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template<class Y>
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#if !defined( BOOST_SP_NO_SP_CONVERTIBLE )
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shared_array( shared_array<Y> const & r, typename boost::detail::sp_enable_if_convertible< Y[], T[] >::type = boost::detail::sp_empty() )
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#else
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shared_array( shared_array<Y> const & r )
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#endif
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BOOST_NOEXCEPT : px( r.px ), pn( r.pn ) // never throws
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{
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boost::detail::sp_assert_convertible< Y[], T[] >();
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}
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// aliasing
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template< class Y >
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shared_array( shared_array<Y> const & r, element_type * p ) BOOST_NOEXCEPT : px( p ), pn( r.pn )
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{
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}
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// assignment
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shared_array & operator=( shared_array const & r ) BOOST_NOEXCEPT
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{
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this_type( r ).swap( *this );
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return *this;
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}
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#if !defined(BOOST_MSVC) || (BOOST_MSVC >= 1400)
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template<class Y>
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shared_array & operator=( shared_array<Y> const & r ) BOOST_NOEXCEPT
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{
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this_type( r ).swap( *this );
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return *this;
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}
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#endif
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#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
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shared_array & operator=( shared_array && r ) BOOST_NOEXCEPT
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{
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this_type( static_cast< shared_array && >( r ) ).swap( *this );
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return *this;
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}
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template<class Y>
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shared_array & operator=( shared_array<Y> && r ) BOOST_NOEXCEPT
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{
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this_type( static_cast< shared_array<Y> && >( r ) ).swap( *this );
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return *this;
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}
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#endif
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void reset() BOOST_NOEXCEPT
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{
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this_type().swap( *this );
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}
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template<class Y> void reset( Y * p ) // Y must be complete
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{
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BOOST_ASSERT( p == 0 || p != px ); // catch self-reset errors
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this_type( p ).swap( *this );
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}
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template<class Y, class D> void reset( Y * p, D d )
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{
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this_type( p, d ).swap( *this );
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}
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template<class Y, class D, class A> void reset( Y * p, D d, A a )
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{
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this_type( p, d, a ).swap( *this );
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}
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template<class Y> void reset( shared_array<Y> const & r, element_type * p )
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{
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this_type( r, p ).swap( *this );
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}
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T & operator[] (std::ptrdiff_t i) const // never throws (but has a BOOST_ASSERT in it, so not marked with BOOST_NOEXCEPT)
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{
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BOOST_ASSERT(px != 0);
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BOOST_ASSERT(i >= 0);
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return px[i];
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}
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T * get() const BOOST_NOEXCEPT
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{
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return px;
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}
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// implicit conversion to "bool"
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#include <boost/smart_ptr/detail/operator_bool.hpp>
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bool unique() const BOOST_NOEXCEPT
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{
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return pn.unique();
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}
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long use_count() const BOOST_NOEXCEPT
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{
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return pn.use_count();
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}
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void swap(shared_array<T> & other) BOOST_NOEXCEPT
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{
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std::swap(px, other.px);
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pn.swap(other.pn);
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}
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void * _internal_get_deleter( boost::detail::sp_typeinfo const & ti ) const
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{
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return pn.get_deleter( ti );
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}
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private:
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template<class Y> friend class shared_array;
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T * px; // contained pointer
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detail::shared_count pn; // reference counter
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}; // shared_array
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template<class T> inline bool operator==(shared_array<T> const & a, shared_array<T> const & b) BOOST_NOEXCEPT
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{
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return a.get() == b.get();
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}
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template<class T> inline bool operator!=(shared_array<T> const & a, shared_array<T> const & b) BOOST_NOEXCEPT
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{
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return a.get() != b.get();
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}
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#if !defined( BOOST_NO_CXX11_NULLPTR )
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template<class T> inline bool operator==( shared_array<T> const & p, boost::detail::sp_nullptr_t ) BOOST_NOEXCEPT
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{
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return p.get() == 0;
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}
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template<class T> inline bool operator==( boost::detail::sp_nullptr_t, shared_array<T> const & p ) BOOST_NOEXCEPT
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{
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return p.get() == 0;
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}
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template<class T> inline bool operator!=( shared_array<T> const & p, boost::detail::sp_nullptr_t ) BOOST_NOEXCEPT
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{
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return p.get() != 0;
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}
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template<class T> inline bool operator!=( boost::detail::sp_nullptr_t, shared_array<T> const & p ) BOOST_NOEXCEPT
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{
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return p.get() != 0;
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}
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#endif
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template<class T> inline bool operator<(shared_array<T> const & a, shared_array<T> const & b) BOOST_NOEXCEPT
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{
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return std::less<T*>()(a.get(), b.get());
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}
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template<class T> void swap(shared_array<T> & a, shared_array<T> & b) BOOST_NOEXCEPT
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{
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a.swap(b);
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}
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template< class D, class T > D * get_deleter( shared_array<T> const & p )
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{
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return static_cast< D * >( p._internal_get_deleter( BOOST_SP_TYPEID(D) ) );
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}
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} // namespace boost
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#endif // #if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES)
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#endif // #ifndef BOOST_SMART_PTR_SHARED_ARRAY_HPP_INCLUDED
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