64 lines
1.6 KiB
C++
64 lines
1.6 KiB
C++
// This header intentionally has no include guards.
|
|
//
|
|
// Copyright (c) 2001-2009, 2012 Peter Dimov
|
|
//
|
|
// Distributed under the Boost Software License, Version 1.0.
|
|
// See accompanying file LICENSE_1_0.txt or copy at
|
|
// http://www.boost.org/LICENSE_1_0.txt
|
|
|
|
#if !defined( BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS ) && !defined( BOOST_NO_CXX11_NULLPTR )
|
|
|
|
explicit operator bool () const BOOST_NOEXCEPT
|
|
{
|
|
return px != 0;
|
|
}
|
|
|
|
#elif ( defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, < 0x570) ) || defined(__CINT__)
|
|
|
|
operator bool () const BOOST_NOEXCEPT
|
|
{
|
|
return px != 0;
|
|
}
|
|
|
|
#elif defined( _MANAGED )
|
|
|
|
static void unspecified_bool( this_type*** )
|
|
{
|
|
}
|
|
|
|
typedef void (*unspecified_bool_type)( this_type*** );
|
|
|
|
operator unspecified_bool_type() const BOOST_NOEXCEPT
|
|
{
|
|
return px == 0? 0: unspecified_bool;
|
|
}
|
|
|
|
#elif \
|
|
( defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, < 0x3200) ) || \
|
|
( defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ < 304) ) || \
|
|
( defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x590) )
|
|
|
|
typedef element_type * (this_type::*unspecified_bool_type)() const;
|
|
|
|
operator unspecified_bool_type() const BOOST_NOEXCEPT
|
|
{
|
|
return px == 0? 0: &this_type::get;
|
|
}
|
|
|
|
#else
|
|
|
|
typedef element_type * this_type::*unspecified_bool_type;
|
|
|
|
operator unspecified_bool_type() const BOOST_NOEXCEPT
|
|
{
|
|
return px == 0? 0: &this_type::px;
|
|
}
|
|
|
|
#endif
|
|
|
|
// operator! is redundant, but some compilers need it
|
|
bool operator! () const BOOST_NOEXCEPT
|
|
{
|
|
return px == 0;
|
|
}
|