Chris@16: #ifndef BOOST_SMART_PTR_DETAIL_SHARED_ARRAY_NMT_HPP_INCLUDED
Chris@16: #define BOOST_SMART_PTR_DETAIL_SHARED_ARRAY_NMT_HPP_INCLUDED
Chris@16: 
Chris@16: //
Chris@16: //  detail/shared_array_nmt.hpp - shared_array.hpp without member templates
Chris@16: //
Chris@16: //  (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
Chris@16: //  Copyright (c) 2001, 2002 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/assert.hpp>
Chris@16: #include <boost/checked_delete.hpp>
Chris@16: #include <boost/throw_exception.hpp>
Chris@16: #include <boost/smart_ptr/detail/atomic_count.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: #include <new>              // for std::bad_alloc
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16: 
Chris@16: template<class T> class shared_array
Chris@16: {
Chris@16: private:
Chris@16: 
Chris@16:     typedef detail::atomic_count count_type;
Chris@16: 
Chris@16: public:
Chris@16: 
Chris@16:     typedef T element_type;
Chris@16:       
Chris@16:     explicit shared_array(T * p = 0): px(p)
Chris@16:     {
Chris@16: #ifndef BOOST_NO_EXCEPTIONS
Chris@16: 
Chris@16:         try  // prevent leak if new throws
Chris@16:         {
Chris@16:             pn = new count_type(1);
Chris@16:         }
Chris@16:         catch(...)
Chris@16:         {
Chris@16:             boost::checked_array_delete(p);
Chris@16:             throw;
Chris@16:         }
Chris@16: 
Chris@16: #else
Chris@16: 
Chris@16:         pn = new count_type(1);
Chris@16: 
Chris@16:         if(pn == 0)
Chris@16:         {
Chris@16:             boost::checked_array_delete(p);
Chris@16:             boost::throw_exception(std::bad_alloc());
Chris@16:         }
Chris@16: 
Chris@16: #endif
Chris@16:     }
Chris@16: 
Chris@16:     ~shared_array()
Chris@16:     {
Chris@16:         if(--*pn == 0)
Chris@16:         {
Chris@16:             boost::checked_array_delete(px);
Chris@16:             delete pn;
Chris@16:         }
Chris@16:     }
Chris@16: 
Chris@16:     shared_array(shared_array const & r) : px(r.px)  // never throws
Chris@16:     {
Chris@16:         pn = r.pn;
Chris@16:         ++*pn;
Chris@16:     }
Chris@16: 
Chris@16:     shared_array & operator=(shared_array const & r)
Chris@16:     {
Chris@16:         shared_array(r).swap(*this);
Chris@16:         return *this;
Chris@16:     }
Chris@16: 
Chris@16:     void reset(T * p = 0)
Chris@16:     {
Chris@16:         BOOST_ASSERT(p == 0 || p != px);
Chris@16:         shared_array(p).swap(*this);
Chris@16:     }
Chris@16: 
Chris@16:     T * get() const  // never throws
Chris@16:     {
Chris@16:         return px;
Chris@16:     }
Chris@16: 
Chris@16:     T & operator[](std::ptrdiff_t i) const  // never throws
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:     long use_count() const  // never throws
Chris@16:     {
Chris@16:         return *pn;
Chris@16:     }
Chris@16: 
Chris@16:     bool unique() const  // never throws
Chris@16:     {
Chris@16:         return *pn == 1;
Chris@16:     }
Chris@16: 
Chris@16:     void swap(shared_array<T> & other)  // never throws
Chris@16:     {
Chris@16:         std::swap(px, other.px);
Chris@16:         std::swap(pn, other.pn);
Chris@16:     }
Chris@16: 
Chris@16: private:
Chris@16: 
Chris@16:     T * px;            // contained pointer
Chris@16:     count_type * pn;   // ptr to reference counter
Chris@16:       
Chris@16: };  // shared_array
Chris@16: 
Chris@16: template<class T, class U> inline bool operator==(shared_array<T> const & a, shared_array<U> const & b)
Chris@16: {
Chris@16:     return a.get() == b.get();
Chris@16: }
Chris@16: 
Chris@16: template<class T, class U> inline bool operator!=(shared_array<T> const & a, shared_array<U> const & b)
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)
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)
Chris@16: {
Chris@16:     a.swap(b);
Chris@16: }
Chris@16: 
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif  // #ifndef BOOST_SMART_PTR_DETAIL_SHARED_ARRAY_NMT_HPP_INCLUDED