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106 lines
1.9 KiB
106 lines
1.9 KiB
//----------------------------------------------------------------------------- |
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// boost blank.hpp header file |
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// See http://www.boost.org for updates, documentation, and revision history. |
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//----------------------------------------------------------------------------- |
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// |
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// Copyright (c) 2003 |
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// Eric Friedman |
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// |
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// Distributed under the Boost Software License, Version 1.0. (See |
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// 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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#ifndef BOOST_BLANK_HPP |
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#define BOOST_BLANK_HPP |
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#include "boost/blank_fwd.hpp" |
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#if !defined(BOOST_NO_IOSTREAM) |
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#include <iosfwd> // for std::basic_ostream forward declare |
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#include "boost/detail/templated_streams.hpp" |
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#endif // BOOST_NO_IOSTREAM |
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#include "boost/type_traits/integral_constant.hpp" |
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#include "boost/type_traits/is_empty.hpp" |
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#include "boost/type_traits/is_pod.hpp" |
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#include "boost/type_traits/is_stateless.hpp" |
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namespace boost { |
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struct blank |
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{ |
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}; |
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// type traits specializations |
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// |
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template <> |
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struct is_pod< blank > |
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: boost::true_type |
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{ |
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}; |
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template <> |
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struct is_empty< blank > |
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: boost::true_type |
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{ |
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}; |
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template <> |
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struct is_stateless< blank > |
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: boost::true_type |
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{ |
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}; |
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// relational operators |
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// |
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inline bool operator==(const blank&, const blank&) |
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{ |
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return true; |
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} |
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inline bool operator<=(const blank&, const blank&) |
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{ |
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return true; |
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} |
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inline bool operator>=(const blank&, const blank&) |
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{ |
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return true; |
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} |
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inline bool operator!=(const blank&, const blank&) |
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{ |
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return false; |
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} |
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inline bool operator<(const blank&, const blank&) |
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{ |
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return false; |
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} |
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inline bool operator>(const blank&, const blank&) |
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{ |
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return false; |
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} |
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// streaming support |
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// |
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#if !defined(BOOST_NO_IOSTREAM) |
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BOOST_TEMPLATED_STREAM_TEMPLATE(E,T) |
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inline BOOST_TEMPLATED_STREAM(ostream, E,T)& operator<<( |
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BOOST_TEMPLATED_STREAM(ostream, E,T)& out |
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, const blank& |
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) |
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{ |
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// (output nothing) |
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return out; |
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} |
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#endif // BOOST_NO_IOSTREAM |
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} // namespace boost |
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#endif // BOOST_BLANK_HPP
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