#ifndef BOOST_SMART_PTR_DETAIL_SHARED_PTR_NMT_HPP_INCLUDED | |
#define BOOST_SMART_PTR_DETAIL_SHARED_PTR_NMT_HPP_INCLUDED | |
// | |
// detail/shared_ptr_nmt.hpp - shared_ptr.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_ptr.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> | |
#ifndef BOOST_NO_AUTO_PTR | |
# include <memory> // for std::auto_ptr | |
#endif | |
#include <algorithm> // for std::swap | |
#include <functional> // for std::less | |
#include <new> // for std::bad_alloc | |
namespace boost | |
{ | |
template<class T> class shared_ptr | |
{ | |
private: | |
typedef detail::atomic_count count_type; | |
public: | |
typedef T element_type; | |
typedef T value_type; | |
explicit shared_ptr(T * p = 0): px(p) | |
{ | |
#ifndef BOOST_NO_EXCEPTIONS | |
try // prevent leak if new throws | |
{ | |
pn = new count_type(1); | |
} | |
catch(...) | |
{ | |
boost::checked_delete(p); | |
throw; | |
} | |
#else | |
pn = new count_type(1); | |
if(pn == 0) | |
{ | |
boost::checked_delete(p); | |
boost::throw_exception(std::bad_alloc()); | |
} | |
#endif | |
} | |
~shared_ptr() | |
{ | |
if(--*pn == 0) | |
{ | |
boost::checked_delete(px); | |
delete pn; | |
} | |
} | |
shared_ptr(shared_ptr const & r): px(r.px) // never throws | |
{ | |
pn = r.pn; | |
++*pn; | |
} | |
shared_ptr & operator=(shared_ptr const & r) | |
{ | |
shared_ptr(r).swap(*this); | |
return *this; | |
} | |
#ifndef BOOST_NO_AUTO_PTR | |
explicit shared_ptr(std::auto_ptr<T> & r) | |
{ | |
pn = new count_type(1); // may throw | |
px = r.release(); // fix: moved here to stop leak if new throws | |
} | |
shared_ptr & operator=(std::auto_ptr<T> & r) | |
{ | |
shared_ptr(r).swap(*this); | |
return *this; | |
} | |
#endif | |
void reset(T * p = 0) | |
{ | |
BOOST_ASSERT(p == 0 || p != px); | |
shared_ptr(p).swap(*this); | |
} | |
T & operator*() const // never throws | |
{ | |
BOOST_ASSERT(px != 0); | |
return *px; | |
} | |
T * operator->() const // never throws | |
{ | |
BOOST_ASSERT(px != 0); | |
return px; | |
} | |
T * get() const // never throws | |
{ | |
return px; | |
} | |
long use_count() const // never throws | |
{ | |
return *pn; | |
} | |
bool unique() const // never throws | |
{ | |
return *pn == 1; | |
} | |
void swap(shared_ptr<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 | |
}; | |
template<class T, class U> inline bool operator==(shared_ptr<T> const & a, shared_ptr<U> const & b) | |
{ | |
return a.get() == b.get(); | |
} | |
template<class T, class U> inline bool operator!=(shared_ptr<T> const & a, shared_ptr<U> const & b) | |
{ | |
return a.get() != b.get(); | |
} | |
template<class T> inline bool operator<(shared_ptr<T> const & a, shared_ptr<T> const & b) | |
{ | |
return std::less<T*>()(a.get(), b.get()); | |
} | |
template<class T> void swap(shared_ptr<T> & a, shared_ptr<T> & b) | |
{ | |
a.swap(b); | |
} | |
// get_pointer() enables boost::mem_fn to recognize shared_ptr | |
template<class T> inline T * get_pointer(shared_ptr<T> const & p) | |
{ | |
return p.get(); | |
} | |
} // namespace boost | |
#endif // #ifndef BOOST_SMART_PTR_DETAIL_SHARED_PTR_NMT_HPP_INCLUDED |