williamr@2: #ifndef BOOST_SHARED_ARRAY_HPP_INCLUDED
williamr@2: #define BOOST_SHARED_ARRAY_HPP_INCLUDED
williamr@2: 
williamr@2: //
williamr@2: //  shared_array.hpp
williamr@2: //
williamr@2: //  (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
williamr@2: //  Copyright (c) 2001, 2002 Peter Dimov
williamr@2: //
williamr@2: //  Distributed under the Boost Software License, Version 1.0. (See
williamr@2: //  accompanying file LICENSE_1_0.txt or copy at
williamr@2: //  http://www.boost.org/LICENSE_1_0.txt)
williamr@2: //
williamr@2: //  See http://www.boost.org/libs/smart_ptr/shared_array.htm for documentation.
williamr@2: //
williamr@2: 
williamr@2: #include <boost/config.hpp>   // for broken compiler workarounds
williamr@2: 
williamr@2: #if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES)
williamr@2: #include <boost/detail/shared_array_nmt.hpp>
williamr@2: #else
williamr@2: 
williamr@2: #include <memory>             // TR1 cyclic inclusion fix
williamr@2: 
williamr@2: #include <boost/assert.hpp>
williamr@2: #include <boost/checked_delete.hpp>
williamr@2: 
williamr@2: #include <boost/detail/shared_count.hpp>
williamr@2: #include <boost/detail/workaround.hpp>
williamr@2: 
williamr@2: #include <cstddef>            // for std::ptrdiff_t
williamr@2: #include <algorithm>          // for std::swap
williamr@2: #include <functional>         // for std::less
williamr@2: 
williamr@2: namespace boost
williamr@2: {
williamr@2: 
williamr@2: //
williamr@2: //  shared_array
williamr@2: //
williamr@2: //  shared_array extends shared_ptr to arrays.
williamr@2: //  The array pointed to is deleted when the last shared_array pointing to it
williamr@2: //  is destroyed or reset.
williamr@2: //
williamr@2: 
williamr@2: template<class T> class shared_array
williamr@2: {
williamr@2: private:
williamr@2: 
williamr@2:     // Borland 5.5.1 specific workarounds
williamr@2:     typedef checked_array_deleter<T> deleter;
williamr@2:     typedef shared_array<T> this_type;
williamr@2: 
williamr@2: public:
williamr@2: 
williamr@2:     typedef T element_type;
williamr@2: 
williamr@2:     explicit shared_array(T * p = 0): px(p), pn(p, deleter())
williamr@2:     {
williamr@2:     }
williamr@2: 
williamr@2:     //
williamr@2:     // Requirements: D's copy constructor must not throw
williamr@2:     //
williamr@2:     // shared_array will release p by calling d(p)
williamr@2:     //
williamr@2: 
williamr@2:     template<class D> shared_array(T * p, D d): px(p), pn(p, d)
williamr@2:     {
williamr@2:     }
williamr@2: 
williamr@2: //  generated copy constructor, assignment, destructor are fine
williamr@2: 
williamr@2:     void reset(T * p = 0)
williamr@2:     {
williamr@2:         BOOST_ASSERT(p == 0 || p != px);
williamr@2:         this_type(p).swap(*this);
williamr@2:     }
williamr@2: 
williamr@2:     template <class D> void reset(T * p, D d)
williamr@2:     {
williamr@2:         this_type(p, d).swap(*this);
williamr@2:     }
williamr@2: 
williamr@2:     T & operator[] (std::ptrdiff_t i) const // never throws
williamr@2:     {
williamr@2:         BOOST_ASSERT(px != 0);
williamr@2:         BOOST_ASSERT(i >= 0);
williamr@2:         return px[i];
williamr@2:     }
williamr@2:     
williamr@2:     T * get() const // never throws
williamr@2:     {
williamr@2:         return px;
williamr@2:     }
williamr@2: 
williamr@2:     // implicit conversion to "bool"
williamr@2: 
williamr@2: #if defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x530)
williamr@2: 
williamr@2:     operator bool () const
williamr@2:     {
williamr@2:         return px != 0;
williamr@2:     }
williamr@2: 
williamr@2: #elif defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003))
williamr@2:     typedef T * (this_type::*unspecified_bool_type)() const;
williamr@2:     
williamr@2:     operator unspecified_bool_type() const // never throws
williamr@2:     {
williamr@2:         return px == 0? 0: &this_type::get;
williamr@2:     }
williamr@2: 
williamr@2: #else 
williamr@2: 
williamr@2:     typedef T * this_type::*unspecified_bool_type;
williamr@2: 
williamr@2:     operator unspecified_bool_type() const // never throws
williamr@2:     {
williamr@2:         return px == 0? 0: &this_type::px;
williamr@2:     }
williamr@2: 
williamr@2: #endif
williamr@2: 
williamr@2:     bool operator! () const // never throws
williamr@2:     {
williamr@2:         return px == 0;
williamr@2:     }
williamr@2: 
williamr@2:     bool unique() const // never throws
williamr@2:     {
williamr@2:         return pn.unique();
williamr@2:     }
williamr@2: 
williamr@2:     long use_count() const // never throws
williamr@2:     {
williamr@2:         return pn.use_count();
williamr@2:     }
williamr@2: 
williamr@2:     void swap(shared_array<T> & other) // never throws
williamr@2:     {
williamr@2:         std::swap(px, other.px);
williamr@2:         pn.swap(other.pn);
williamr@2:     }
williamr@2: 
williamr@2: private:
williamr@2: 
williamr@2:     T * px;                     // contained pointer
williamr@2:     detail::shared_count pn;    // reference counter
williamr@2: 
williamr@2: };  // shared_array
williamr@2: 
williamr@2: template<class T> inline bool operator==(shared_array<T> const & a, shared_array<T> const & b) // never throws
williamr@2: {
williamr@2:     return a.get() == b.get();
williamr@2: }
williamr@2: 
williamr@2: template<class T> inline bool operator!=(shared_array<T> const & a, shared_array<T> const & b) // never throws
williamr@2: {
williamr@2:     return a.get() != b.get();
williamr@2: }
williamr@2: 
williamr@2: template<class T> inline bool operator<(shared_array<T> const & a, shared_array<T> const & b) // never throws
williamr@2: {
williamr@2:     return std::less<T*>()(a.get(), b.get());
williamr@2: }
williamr@2: 
williamr@2: template<class T> void swap(shared_array<T> & a, shared_array<T> & b) // never throws
williamr@2: {
williamr@2:     a.swap(b);
williamr@2: }
williamr@2: 
williamr@2: } // namespace boost
williamr@2: 
williamr@2: #endif  // #if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES)
williamr@2: 
williamr@2: #endif  // #ifndef BOOST_SHARED_ARRAY_HPP_INCLUDED