| 1 | // This header intentionally has no include guards. |
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| 2 | // |
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| 3 | // Copyright (c) 2001-2009, 2012 Peter Dimov |
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| 4 | // |
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| 5 | // Distributed under the Boost Software License, Version 1.0. |
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| 6 | // See accompanying file LICENSE_1_0.txt or copy at |
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| 7 | // http://www.boost.org/LICENSE_1_0.txt |
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| 8 | |
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| 9 | #if !defined( BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS ) && !defined( BOOST_NO_CXX11_NULLPTR )\ |
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| 10 | && !(defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x5130)) |
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| 11 | |
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| 12 | explicit operator bool () const BOOST_SP_NOEXCEPT |
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| 13 | { |
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| 14 | return px != 0; |
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| 15 | } |
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| 16 | |
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| 17 | #elif ( defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, < 0x570) ) || defined(__CINT__) |
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| 18 | |
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| 19 | operator bool () const BOOST_SP_NOEXCEPT |
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| 20 | { |
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| 21 | return px != 0; |
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| 22 | } |
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| 23 | |
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| 24 | #elif defined( _MANAGED ) |
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| 25 | |
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| 26 | static void unspecified_bool( this_type*** ) |
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| 27 | { |
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| 28 | } |
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| 29 | |
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| 30 | typedef void (*unspecified_bool_type)( this_type*** ); |
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| 31 | |
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| 32 | operator unspecified_bool_type() const BOOST_SP_NOEXCEPT |
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| 33 | { |
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| 34 | return px == 0? 0: unspecified_bool; |
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| 35 | } |
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| 36 | |
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| 37 | #elif \ |
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| 38 | ( defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, < 0x3200) ) || \ |
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| 39 | ( defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ < 304) ) || \ |
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| 40 | ( defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x590) ) |
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| 41 | |
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| 42 | typedef element_type * (this_type::*unspecified_bool_type)() const; |
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| 43 | |
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| 44 | operator unspecified_bool_type() const BOOST_SP_NOEXCEPT |
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| 45 | { |
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| 46 | return px == 0? 0: &this_type::get; |
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| 47 | } |
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| 48 | |
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| 49 | #else |
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| 50 | |
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| 51 | typedef element_type * this_type::*unspecified_bool_type; |
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| 52 | |
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| 53 | operator unspecified_bool_type() const BOOST_SP_NOEXCEPT |
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| 54 | { |
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| 55 | return px == 0? 0: &this_type::px; |
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| 56 | } |
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| 57 | |
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| 58 | #endif |
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| 59 | |
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| 60 | // operator! is redundant, but some compilers need it |
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| 61 | bool operator! () const BOOST_SP_NOEXCEPT |
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| 62 | { |
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| 63 | return px == 0; |
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| 64 | } |
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| 65 | |
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