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1 | // This header intentionally has no include guards. |
2 | // | |
3 | // Copyright (c) 2001-2009, 2012 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( BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS ) && !defined( BOOST_NO_CXX11_NULLPTR )\ | |
10 | && !(defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x5130)) | |
11 | ||
12 | explicit operator bool () const BOOST_NOEXCEPT | |
13 | { | |
14 | return px != 0; | |
15 | } | |
16 | ||
17 | #elif ( defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, < 0x570) ) || defined(__CINT__) | |
18 | ||
19 | operator bool () const BOOST_NOEXCEPT | |
20 | { | |
21 | return px != 0; | |
22 | } | |
23 | ||
24 | #elif defined( _MANAGED ) | |
25 | ||
26 | static void unspecified_bool( this_type*** ) | |
27 | { | |
28 | } | |
29 | ||
30 | typedef void (*unspecified_bool_type)( this_type*** ); | |
31 | ||
32 | operator unspecified_bool_type() const BOOST_NOEXCEPT | |
33 | { | |
34 | return px == 0? 0: unspecified_bool; | |
35 | } | |
36 | ||
37 | #elif \ | |
38 | ( defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, < 0x3200) ) || \ | |
39 | ( defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ < 304) ) || \ | |
40 | ( defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x590) ) | |
41 | ||
42 | typedef element_type * (this_type::*unspecified_bool_type)() const; | |
43 | ||
44 | operator unspecified_bool_type() const BOOST_NOEXCEPT | |
45 | { | |
46 | return px == 0? 0: &this_type::get; | |
47 | } | |
48 | ||
49 | #else | |
50 | ||
51 | typedef element_type * this_type::*unspecified_bool_type; | |
52 | ||
53 | operator unspecified_bool_type() const BOOST_NOEXCEPT | |
54 | { | |
55 | return px == 0? 0: &this_type::px; | |
56 | } | |
57 | ||
58 | #endif | |
59 | ||
60 | // operator! is redundant, but some compilers need it | |
61 | bool operator! () const BOOST_NOEXCEPT | |
62 | { | |
63 | return px == 0; | |
64 | } |