1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
// Copyright (c) 2012-2014 Konstantin Isakov <ikm@zbackup.org> and ZBackup contributors, see CONTRIBUTORS
// Part of ZBackup. Licensed under GNU GPLv2 or later + OpenSSL, see LICENSE
#ifndef SPTR_HH_INCLUDED
#define SPTR_HH_INCLUDED
/// A generic non-intrusive smart-pointer template. We could use boost::, tr1::
/// or whatever, but since there's no standard solution yet, it isn't worth
/// the dependency given the simplicity of the template
template< class T >
class sptr_base
{
template< class TT > friend class sptr_base;
T * p;
unsigned * count;
void increment()
{
if ( count )
++*count;
}
public:
sptr_base(): p( 0 ), count( 0 ) {}
sptr_base( T * p_ ): p( p_ ), count( p ? new unsigned( 1 ) : 0 )
{
}
sptr_base( sptr_base< T > const & other ): p( other.p ), count( other.count )
{ increment(); }
// TT is meant to be a derivative of T
template< class TT >
sptr_base( sptr_base< TT > const & other ): p( ( T * ) other.p ),
count( other.count )
{ increment(); }
void reset()
{
if ( count )
{
if ( ! -- *count )
{
delete count;
count = 0;
if ( p )
{
T * p_ = p;
p = 0;
delete p_;
}
}
else
{
p = 0;
count = 0;
}
}
}
unsigned use_count() const
{ return count; }
sptr_base & operator = ( sptr_base const & other )
{ if ( &other != this ) { reset(); p = other.p; count = other.count; increment(); }
return * this; }
operator bool( void ) const
{ return !!p; }
bool operator ! ( void ) const
{ return !p; }
bool operator == ( sptr_base const & other ) const
{ return p == other.p; }
bool operator != ( sptr_base const & other ) const
{ return p != other.p; }
~sptr_base()
{ reset(); }
protected:
T * get_base( void ) const
{ return p; }
};
template< class T >
class sptr: public sptr_base< T >
{
public:
sptr() {}
sptr( T * p ): sptr_base< T >( p ) {}
// TT is meant to be a derivative of T
template< class TT >
sptr( sptr< TT > const & other ): sptr_base< T >( other ) {}
// Retrieval
T * get( void ) const
{ return sptr_base< T > :: get_base(); }
T * operator -> ( void ) const
{ return get(); }
T & operator * ( void ) const
{ return * get(); }
// Check
operator bool( void ) const
{ return get(); }
bool operator ! ( void ) const
{ return !get(); }
};
template< class T >
class const_sptr: public sptr_base< T >
{
public:
const_sptr() {}
const_sptr( T * p_ ): sptr_base< T >( p_ ) {}
const_sptr( sptr< T > const & other ): sptr_base< T >( other ) {}
// TT is meant to be a derivative of T
template< class TT >
const_sptr( sptr_base< TT > const & other ): sptr_base< T >( other ) {}
// Retrieval
T const * get( void ) const
{ return sptr_base< T > :: get_base(); }
T const * operator -> ( void ) const
{ return get(); }
T const & operator * ( void ) const
{ return * get(); }
};
#endif
|
