Chris@16: #ifndef BOOST_SMART_PTR_SHARED_ARRAY_HPP_INCLUDED
Chris@16: #define BOOST_SMART_PTR_SHARED_ARRAY_HPP_INCLUDED
Chris@16: 
Chris@16: //
Chris@16: //  shared_array.hpp
Chris@16: //
Chris@16: //  (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
Chris@16: //  Copyright (c) 2001, 2002, 2012 Peter Dimov
Chris@16: //
Chris@16: //  Distributed under the Boost Software License, Version 1.0. (See
Chris@16: //  accompanying file LICENSE_1_0.txt or copy at
Chris@16: //  http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: //  See http://www.boost.org/libs/smart_ptr/shared_array.htm for documentation.
Chris@16: //
Chris@16: 
Chris@16: #include <boost/config.hpp>   // for broken compiler workarounds
Chris@16: 
Chris@16: #include <memory>             // TR1 cyclic inclusion fix
Chris@16: 
Chris@16: #include <boost/assert.hpp>
Chris@16: #include <boost/checked_delete.hpp>
Chris@16: 
Chris@16: #include <boost/smart_ptr/shared_ptr.hpp>
Chris@16: #include <boost/smart_ptr/detail/shared_count.hpp>
Chris@16: #include <boost/smart_ptr/detail/sp_nullptr_t.hpp>
Chris@16: #include <boost/detail/workaround.hpp>
Chris@16: 
Chris@16: #include <cstddef>            // for std::ptrdiff_t
Chris@16: #include <algorithm>          // for std::swap
Chris@16: #include <functional>         // for std::less
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16: 
Chris@16: //
Chris@16: //  shared_array
Chris@16: //
Chris@16: //  shared_array extends shared_ptr to arrays.
Chris@16: //  The array pointed to is deleted when the last shared_array pointing to it
Chris@16: //  is destroyed or reset.
Chris@16: //
Chris@16: 
Chris@16: template<class T> class shared_array
Chris@16: {
Chris@16: private:
Chris@16: 
Chris@16:     // Borland 5.5.1 specific workarounds
Chris@16:     typedef checked_array_deleter<T> deleter;
Chris@16:     typedef shared_array<T> this_type;
Chris@16: 
Chris@16: public:
Chris@16: 
Chris@16:     typedef T element_type;
Chris@16: 
Chris@16:     shared_array() BOOST_NOEXCEPT : px( 0 ), pn()
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@101: #if !defined( BOOST_NO_CXX11_NULLPTR )
Chris@101: 
Chris@101:     shared_array( boost::detail::sp_nullptr_t ) BOOST_NOEXCEPT : px( 0 ), pn()
Chris@101:     {
Chris@101:     }
Chris@101: 
Chris@101: #endif
Chris@101: 
Chris@16:     template<class Y>
Chris@16:     explicit shared_array( Y * p ): px( p ), pn( p, checked_array_deleter<Y>() )
Chris@16:     {
Chris@16:         boost::detail::sp_assert_convertible< Y[], T[] >();
Chris@16:     }
Chris@16: 
Chris@16:     //
Chris@16:     // Requirements: D's copy constructor must not throw
Chris@16:     //
Chris@16:     // shared_array will release p by calling d(p)
Chris@16:     //
Chris@16: 
Chris@16:     template<class Y, class D> shared_array( Y * p, D d ): px( p ), pn( p, d )
Chris@16:     {
Chris@16:         boost::detail::sp_assert_convertible< Y[], T[] >();
Chris@16:     }
Chris@16: 
Chris@16:     // As above, but with allocator. A's copy constructor shall not throw.
Chris@16: 
Chris@16:     template<class Y, class D, class A> shared_array( Y * p, D d, A a ): px( p ), pn( p, d, a )
Chris@16:     {
Chris@16:         boost::detail::sp_assert_convertible< Y[], T[] >();
Chris@16:     }
Chris@16: 
Chris@16: //  generated copy constructor, destructor are fine...
Chris@16: 
Chris@16: #if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
Chris@16: 
Chris@16: // ... except in C++0x, move disables the implicit copy
Chris@16: 
Chris@16:     shared_array( shared_array const & r ) BOOST_NOEXCEPT : px( r.px ), pn( r.pn )
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16:     shared_array( shared_array && r ) BOOST_NOEXCEPT : px( r.px ), pn()
Chris@16:     {
Chris@16:         pn.swap( r.pn );
Chris@16:         r.px = 0;
Chris@16:     }
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16:     // conversion
Chris@16: 
Chris@16:     template<class Y>
Chris@16: #if !defined( BOOST_SP_NO_SP_CONVERTIBLE )
Chris@16: 
Chris@16:     shared_array( shared_array<Y> const & r, typename boost::detail::sp_enable_if_convertible< Y[], T[] >::type = boost::detail::sp_empty() )
Chris@16: 
Chris@16: #else
Chris@16: 
Chris@16:     shared_array( shared_array<Y> const & r )
Chris@16: 
Chris@16: #endif
Chris@16:     BOOST_NOEXCEPT : px( r.px ), pn( r.pn ) // never throws
Chris@16:     {
Chris@16:         boost::detail::sp_assert_convertible< Y[], T[] >();
Chris@16:     }
Chris@16: 
Chris@16:     // aliasing
Chris@16: 
Chris@16:     template< class Y >
Chris@16:     shared_array( shared_array<Y> const & r, element_type * p ) BOOST_NOEXCEPT : px( p ), pn( r.pn )
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16:     // assignment
Chris@16: 
Chris@16:     shared_array & operator=( shared_array const & r ) BOOST_NOEXCEPT
Chris@16:     {
Chris@16:         this_type( r ).swap( *this );
Chris@16:         return *this;
Chris@16:     }
Chris@16: 
Chris@16: #if !defined(BOOST_MSVC) || (BOOST_MSVC >= 1400)
Chris@16: 
Chris@16:     template<class Y>
Chris@16:     shared_array & operator=( shared_array<Y> const & r ) BOOST_NOEXCEPT
Chris@16:     {
Chris@16:         this_type( r ).swap( *this );
Chris@16:         return *this;
Chris@16:     }
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16: #if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
Chris@16: 
Chris@16:     shared_array & operator=( shared_array && r ) BOOST_NOEXCEPT
Chris@16:     {
Chris@16:         this_type( static_cast< shared_array && >( r ) ).swap( *this );
Chris@16:         return *this;
Chris@16:     }
Chris@16: 
Chris@16:     template<class Y>
Chris@16:     shared_array & operator=( shared_array<Y> && r ) BOOST_NOEXCEPT
Chris@16:     {
Chris@16:         this_type( static_cast< shared_array<Y> && >( r ) ).swap( *this );
Chris@16:         return *this;
Chris@16:     }
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16:     void reset() BOOST_NOEXCEPT
Chris@16:     {
Chris@16:         this_type().swap( *this );
Chris@16:     }
Chris@16: 
Chris@16:     template<class Y> void reset( Y * p ) // Y must be complete
Chris@16:     {
Chris@16:         BOOST_ASSERT( p == 0 || p != px ); // catch self-reset errors
Chris@16:         this_type( p ).swap( *this );
Chris@16:     }
Chris@16: 
Chris@16:     template<class Y, class D> void reset( Y * p, D d )
Chris@16:     {
Chris@16:         this_type( p, d ).swap( *this );
Chris@16:     }
Chris@16: 
Chris@16:     template<class Y, class D, class A> void reset( Y * p, D d, A a )
Chris@16:     {
Chris@16:         this_type( p, d, a ).swap( *this );
Chris@16:     }
Chris@16: 
Chris@16:     template<class Y> void reset( shared_array<Y> const & r, element_type * p )
Chris@16:     {
Chris@16:         this_type( r, p ).swap( *this );
Chris@16:     }
Chris@16: 
Chris@16:     T & operator[] (std::ptrdiff_t i) const // never throws (but has a BOOST_ASSERT in it, so not marked with BOOST_NOEXCEPT)
Chris@16:     {
Chris@16:         BOOST_ASSERT(px != 0);
Chris@16:         BOOST_ASSERT(i >= 0);
Chris@16:         return px[i];
Chris@16:     }
Chris@16:     
Chris@16:     T * get() const BOOST_NOEXCEPT
Chris@16:     {
Chris@16:         return px;
Chris@16:     }
Chris@16: 
Chris@16: // implicit conversion to "bool"
Chris@16: #include <boost/smart_ptr/detail/operator_bool.hpp>
Chris@16: 
Chris@16:     bool unique() const BOOST_NOEXCEPT
Chris@16:     {
Chris@16:         return pn.unique();
Chris@16:     }
Chris@16: 
Chris@16:     long use_count() const BOOST_NOEXCEPT
Chris@16:     {
Chris@16:         return pn.use_count();
Chris@16:     }
Chris@16: 
Chris@16:     void swap(shared_array<T> & other) BOOST_NOEXCEPT
Chris@16:     {
Chris@16:         std::swap(px, other.px);
Chris@16:         pn.swap(other.pn);
Chris@16:     }
Chris@16: 
Chris@16:     void * _internal_get_deleter( boost::detail::sp_typeinfo const & ti ) const
Chris@16:     {
Chris@16:         return pn.get_deleter( ti );
Chris@16:     }
Chris@16: 
Chris@16: private:
Chris@16: 
Chris@16:     template<class Y> friend class shared_array;
Chris@16: 
Chris@16:     T * px;                     // contained pointer
Chris@16:     detail::shared_count pn;    // reference counter
Chris@16: 
Chris@16: };  // shared_array
Chris@16: 
Chris@16: template<class T> inline bool operator==(shared_array<T> const & a, shared_array<T> const & b) BOOST_NOEXCEPT
Chris@16: {
Chris@16:     return a.get() == b.get();
Chris@16: }
Chris@16: 
Chris@16: template<class T> inline bool operator!=(shared_array<T> const & a, shared_array<T> const & b) BOOST_NOEXCEPT
Chris@16: {
Chris@16:     return a.get() != b.get();
Chris@16: }
Chris@16: 
Chris@16: #if !defined( BOOST_NO_CXX11_NULLPTR )
Chris@16: 
Chris@16: template<class T> inline bool operator==( shared_array<T> const & p, boost::detail::sp_nullptr_t ) BOOST_NOEXCEPT
Chris@16: {
Chris@16:     return p.get() == 0;
Chris@16: }
Chris@16: 
Chris@16: template<class T> inline bool operator==( boost::detail::sp_nullptr_t, shared_array<T> const & p ) BOOST_NOEXCEPT
Chris@16: {
Chris@16:     return p.get() == 0;
Chris@16: }
Chris@16: 
Chris@16: template<class T> inline bool operator!=( shared_array<T> const & p, boost::detail::sp_nullptr_t ) BOOST_NOEXCEPT
Chris@16: {
Chris@16:     return p.get() != 0;
Chris@16: }
Chris@16: 
Chris@16: template<class T> inline bool operator!=( boost::detail::sp_nullptr_t, shared_array<T> const & p ) BOOST_NOEXCEPT
Chris@16: {
Chris@16:     return p.get() != 0;
Chris@16: }
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16: template<class T> inline bool operator<(shared_array<T> const & a, shared_array<T> const & b) BOOST_NOEXCEPT
Chris@16: {
Chris@16:     return std::less<T*>()(a.get(), b.get());
Chris@16: }
Chris@16: 
Chris@16: template<class T> void swap(shared_array<T> & a, shared_array<T> & b) BOOST_NOEXCEPT
Chris@16: {
Chris@16:     a.swap(b);
Chris@16: }
Chris@16: 
Chris@16: template< class D, class T > D * get_deleter( shared_array<T> const & p )
Chris@16: {
Chris@16:     return static_cast< D * >( p._internal_get_deleter( BOOST_SP_TYPEID(D) ) );
Chris@16: }
Chris@16: 
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif  // #ifndef BOOST_SMART_PTR_SHARED_ARRAY_HPP_INCLUDED