1 | // This header intentionally has no include guards. |
---|
2 | // |
---|
3 | // Copyright (c) 2001-2009 Peter Dimov |
---|
4 | // |
---|
5 | // Distributed under the Boost Software License, Version 1.0. |
---|
6 | // See accompanying file LICENSE_1_0.txt or copy at |
---|
7 | // http://www.boost.org/LICENSE_1_0.txt |
---|
8 | |
---|
9 | #if ( defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, < 0x570) ) || defined(__CINT__) |
---|
10 | |
---|
11 | operator bool () const |
---|
12 | { |
---|
13 | return px != 0; |
---|
14 | } |
---|
15 | |
---|
16 | #elif defined( _MANAGED ) |
---|
17 | |
---|
18 | static void unspecified_bool( this_type*** ) |
---|
19 | { |
---|
20 | } |
---|
21 | |
---|
22 | typedef void (*unspecified_bool_type)( this_type*** ); |
---|
23 | |
---|
24 | operator unspecified_bool_type() const // never throws |
---|
25 | { |
---|
26 | return px == 0? 0: unspecified_bool; |
---|
27 | } |
---|
28 | |
---|
29 | #elif \ |
---|
30 | ( defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, < 0x3200) ) || \ |
---|
31 | ( defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ < 304) ) || \ |
---|
32 | ( defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x590) ) |
---|
33 | |
---|
34 | typedef T * (this_type::*unspecified_bool_type)() const; |
---|
35 | |
---|
36 | operator unspecified_bool_type() const // never throws |
---|
37 | { |
---|
38 | return px == 0? 0: &this_type::get; |
---|
39 | } |
---|
40 | |
---|
41 | #else |
---|
42 | |
---|
43 | typedef T * this_type::*unspecified_bool_type; |
---|
44 | |
---|
45 | operator unspecified_bool_type() const // never throws |
---|
46 | { |
---|
47 | return px == 0? 0: &this_type::px; |
---|
48 | } |
---|
49 | |
---|
50 | #endif |
---|
51 | |
---|
52 | // operator! is redundant, but some compilers need it |
---|
53 | bool operator! () const // never throws |
---|
54 | { |
---|
55 | return px == 0; |
---|
56 | } |
---|