forked from boostorg/preprocessor
45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
#ifndef BOOST_PREPROCESSOR_IDENTITY_HPP
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#define BOOST_PREPROCESSOR_IDENTITY_HPP
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// Copyright (C) 2001
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// Housemarque Oy
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// http://www.housemarque.com
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//
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// Permission to copy, use, modify, sell and distribute this software is
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// granted provided this copyright notice appears in all copies. This
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// software is provided "as is" without express or implied warranty, and
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// with no claim as to its suitability for any purpose.
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// See http://www.boost.org for most recent version.
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/*! \file
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<a href="../../../../boost/preprocessor/identity.hpp">Click here to see the header.</a>
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*/
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#ifndef BOOST_PREPROCESSOR_EMPTY_HPP
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# include <boost/preprocessor/empty.hpp>
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#endif
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//! Expands to X once invoked.
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/*!
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Designed to be used with BOOST_PREPROCESSOR_IF(), when one of the clauses need to be invoked.
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Example:
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<PRE>\verbatim
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BOOST_PREPROCESSOR_IDENTITY(X)()
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// ^^ NOTE!
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\endverbatim</PRE>
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The above expands to:
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<PRE>\verbatim
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X
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\endverbatim</PRE>
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NOTE: If BOOST_PREPROCESSOR_IDENTITY() is not invoked, the expansion will not be usable.
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*/
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#define BOOST_PREPROCESSOR_IDENTITY(X) X BOOST_PREPROCESSOR_EMPTY
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#endif
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