| // 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; |
| } |