57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
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// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
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// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
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// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See 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_GEOMETRY_UTIL_ADD_CONST_IF_C_HPP
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#define BOOST_GEOMETRY_UTIL_ADD_CONST_IF_C_HPP
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#include <boost/mpl/if.hpp>
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namespace boost { namespace geometry
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{
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/*!
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\brief Meta-function to define a const or non const type
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\ingroup utility
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\details If the boolean template parameter is true, the type parameter
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will be defined as const, otherwise it will be defined as it was.
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This meta-function is used to have one implementation for both
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const and non const references
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\note This traits class is completely independant from Boost.Geometry
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and might be a separate addition to Boost
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\note Used in a.o. for_each, interior_rings, exterior_ring
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\par Example
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\code
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void foo(typename add_const_if_c<IsConst, Point>::type& point)
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\endcode
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*/
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template <bool IsConst, typename Type>
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struct add_const_if_c
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{
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typedef typename boost::mpl::if_c
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<
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IsConst,
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Type const,
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Type
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>::type type;
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};
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_UTIL_ADD_CONST_IF_C_HPP
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