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56 lines
1.6 KiB
56 lines
1.6 KiB
// Boost.Geometry (aka GGL, Generic Geometry Library) |
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// Copyright (c) 2007-2011 Barend Gehrels, Amsterdam, the Netherlands. |
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// Copyright (c) 2008-2011 Bruno Lalande, Paris, France. |
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// Copyright (c) 2009-2011 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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