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107 lines
1.9 KiB
C++
107 lines
1.9 KiB
C++
//-----------------------------------------------------------------------------
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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/mpl/bool.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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: mpl::true_
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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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: mpl::true_
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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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: mpl::true_
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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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