57 lines
1.4 KiB
C++
57 lines
1.4 KiB
C++
// 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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