#ifndef BOOST_SMART_PTR_DETAIL_SHARED_ARRAY_NMT_HPP_INCLUDED | |
#define BOOST_SMART_PTR_DETAIL_SHARED_ARRAY_NMT_HPP_INCLUDED | |
// | |
// detail/shared_array_nmt.hpp - shared_array.hpp without member templates | |
// | |
// (C) Copyright Greg Colvin and Beman Dawes 1998, 1999. | |
// Copyright (c) 2001, 2002 Peter Dimov | |
// | |
// Distributed under the Boost Software License, Version 1.0. (See | |
// accompanying file LICENSE_1_0.txt or copy at | |
// http://www.boost.org/LICENSE_1_0.txt) | |
// | |
// See http://www.boost.org/libs/smart_ptr/shared_array.htm for documentation. | |
// | |
#include <boost/assert.hpp> | |
#include <boost/checked_delete.hpp> | |
#include <boost/throw_exception.hpp> | |
#include <boost/smart_ptr/detail/atomic_count.hpp> | |
#include <cstddef> // for std::ptrdiff_t | |
#include <algorithm> // for std::swap | |
#include <functional> // for std::less | |
#include <new> // for std::bad_alloc | |
namespace boost | |
{ | |
template<class T> class shared_array | |
{ | |
private: | |
typedef detail::atomic_count count_type; | |
public: | |
typedef T element_type; | |
explicit shared_array(T * p = 0): px(p) | |
{ | |
#ifndef BOOST_NO_EXCEPTIONS | |
try // prevent leak if new throws | |
{ | |
pn = new count_type(1); | |
} | |
catch(...) | |
{ | |
boost::checked_array_delete(p); | |
throw; | |
} | |
#else | |
pn = new count_type(1); | |
if(pn == 0) | |
{ | |
boost::checked_array_delete(p); | |
boost::throw_exception(std::bad_alloc()); | |
} | |
#endif | |
} | |
~shared_array() | |
{ | |
if(--*pn == 0) | |
{ | |
boost::checked_array_delete(px); | |
delete pn; | |
} | |
} | |
shared_array(shared_array const & r) : px(r.px) // never throws | |
{ | |
pn = r.pn; | |
++*pn; | |
} | |
shared_array & operator=(shared_array const & r) | |
{ | |
shared_array(r).swap(*this); | |
return *this; | |
} | |
void reset(T * p = 0) | |
{ | |
BOOST_ASSERT(p == 0 || p != px); | |
shared_array(p).swap(*this); | |
} | |
T * get() const // never throws | |
{ | |
return px; | |
} | |
T & operator[](std::ptrdiff_t i) const // never throws | |
{ | |
BOOST_ASSERT(px != 0); | |
BOOST_ASSERT(i >= 0); | |
return px[i]; | |
} | |
long use_count() const // never throws | |
{ | |
return *pn; | |
} | |
bool unique() const // never throws | |
{ | |
return *pn == 1; | |
} | |
void swap(shared_array<T> & other) // never throws | |
{ | |
std::swap(px, other.px); | |
std::swap(pn, other.pn); | |
} | |
private: | |
T * px; // contained pointer | |
count_type * pn; // ptr to reference counter | |
}; // shared_array | |
template<class T, class U> inline bool operator==(shared_array<T> const & a, shared_array<U> const & b) | |
{ | |
return a.get() == b.get(); | |
} | |
template<class T, class U> inline bool operator!=(shared_array<T> const & a, shared_array<U> const & b) | |
{ | |
return a.get() != b.get(); | |
} | |
template<class T> inline bool operator<(shared_array<T> const & a, shared_array<T> const & b) | |
{ | |
return std::less<T*>()(a.get(), b.get()); | |
} | |
template<class T> void swap(shared_array<T> & a, shared_array<T> & b) | |
{ | |
a.swap(b); | |
} | |
} // namespace boost | |
#endif // #ifndef BOOST_SMART_PTR_DETAIL_SHARED_ARRAY_NMT_HPP_INCLUDED |