1
#ifndef BOOST_DETAIL_SHARED_ARRAY_NMT_HPP_INCLUDED
2
#define BOOST_DETAIL_SHARED_ARRAY_NMT_HPP_INCLUDED
5
// detail/shared_array_nmt.hpp - shared_array.hpp without member templates
7
// (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
8
// Copyright (c) 2001, 2002 Peter Dimov
10
// Permission to copy, use, modify, sell and distribute this software
11
// is granted provided this copyright notice appears in all copies.
12
// This software is provided "as is" without express or implied
13
// warranty, and with no claim as to its suitability for any purpose.
15
// See http://www.boost.org/libs/smart_ptr/shared_array.htm for documentation.
18
#include <boost/assert.hpp>
19
#include <boost/checked_delete.hpp>
20
#include <boost/throw_exception.hpp>
21
#include <boost/detail/atomic_count.hpp>
23
#include <cstddef> // for std::ptrdiff_t
24
#include <algorithm> // for std::swap
25
#include <functional> // for std::less
26
#include <new> // for std::bad_alloc
31
template<class T> class shared_array
35
typedef detail::atomic_count count_type;
39
typedef T element_type;
41
explicit shared_array(T * p = 0): px(p)
43
#ifndef BOOST_NO_EXCEPTIONS
45
try // prevent leak if new throws
47
pn = new count_type(1);
51
boost::checked_array_delete(p);
57
pn = new count_type(1);
61
boost::checked_array_delete(p);
62
boost::throw_exception(std::bad_alloc());
72
boost::checked_array_delete(px);
77
shared_array(shared_array const & r) : px(r.px) // never throws
83
shared_array & operator=(shared_array const & r)
85
shared_array(r).swap(*this);
91
BOOST_ASSERT(p == 0 || p != px);
92
shared_array(p).swap(*this);
95
T * get() const // never throws
100
T & operator[](std::ptrdiff_t i) const // never throws
102
BOOST_ASSERT(px != 0);
103
BOOST_ASSERT(i >= 0);
107
long use_count() const // never throws
112
bool unique() const // never throws
117
void swap(shared_array<T> & other) // never throws
119
std::swap(px, other.px);
120
std::swap(pn, other.pn);
125
T * px; // contained pointer
126
count_type * pn; // ptr to reference counter
130
template<class T, class U> inline bool operator==(shared_array<T> const & a, shared_array<U> const & b)
132
return a.get() == b.get();
135
template<class T, class U> inline bool operator!=(shared_array<T> const & a, shared_array<U> const & b)
137
return a.get() != b.get();
140
template<class T> inline bool operator<(shared_array<T> const & a, shared_array<T> const & b)
142
return std::less<T*>()(a.get(), b.get());
145
template<class T> void swap(shared_array<T> & a, shared_array<T> & b)
152
#endif // #ifndef BOOST_DETAIL_SHARED_ARRAY_NMT_HPP_INCLUDED