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56 lines
1.4 KiB
56 lines
1.4 KiB
// This header intentionally has no include guards. |
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// |
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// Copyright (c) 2001-2009 Peter Dimov |
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// |
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// Distributed under the Boost Software License, Version 1.0. |
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// See accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt |
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#if ( defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, < 0x570) ) || defined(__CINT__) |
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operator bool () const |
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{ |
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return px != 0; |
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} |
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#elif defined( _MANAGED ) |
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static void unspecified_bool( this_type*** ) |
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{ |
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} |
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typedef void (*unspecified_bool_type)( this_type*** ); |
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operator unspecified_bool_type() const // never throws |
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{ |
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return px == 0? 0: unspecified_bool; |
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} |
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#elif \ |
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( defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, < 0x3200) ) || \ |
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( defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ < 304) ) || \ |
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( defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x590) ) |
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typedef T * (this_type::*unspecified_bool_type)() const; |
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operator unspecified_bool_type() const // never throws |
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{ |
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return px == 0? 0: &this_type::get; |
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} |
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#else |
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typedef T * this_type::*unspecified_bool_type; |
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operator unspecified_bool_type() const // never throws |
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{ |
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return px == 0? 0: &this_type::px; |
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} |
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#endif |
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// operator! is redundant, but some compilers need it |
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bool operator! () const // never throws |
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{ |
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return px == 0; |
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}
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