forked from boostorg/smart_ptr
169 lines
3.8 KiB
C++
169 lines
3.8 KiB
C++
#ifndef BOOST_SHARED_ARRAY_HPP_INCLUDED
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#define BOOST_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 Peter Dimov
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//
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// Permission to copy, use, modify, sell and distribute this software
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// is granted provided this copyright notice appears in all copies.
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// This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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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/detail/shared_array_nmt.hpp>
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#else
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#include <boost/assert.hpp>
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#include <boost/checked_delete.hpp>
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#include <boost/detail/shared_count.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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explicit shared_array(T * p = 0): px(p), pn(p, deleter())
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{
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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 D> shared_array(T * p, D d): px(p), pn(p, d)
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{
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}
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// generated copy constructor, assignment, destructor are fine
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void reset(T * p = 0)
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{
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BOOST_ASSERT(p == 0 || p != px);
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this_type(p).swap(*this);
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}
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template <class D> void reset(T * 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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T & operator[] (std::ptrdiff_t i) const // never throws
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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 // never throws
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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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#if defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x530)
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operator bool () const
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{
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return px != 0;
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}
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#else
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typedef T * (this_type::*unspecified_bool_type)() const;
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operator unspecified_bool_type() const // never throws
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{
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return px == 0? 0: &this_type::get;
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}
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#endif
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bool operator! () const // never throws
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{
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return px == 0;
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}
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bool unique() const // never throws
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{
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return pn.unique();
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}
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long use_count() const // never throws
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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) // never throws
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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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private:
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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) // never throws
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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) // never throws
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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) // never throws
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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) // never throws
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{
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a.swap(b);
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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_SHARED_ARRAY_HPP_INCLUDED
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