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1 | // Boost.Geometry (aka GGL, Generic Geometry Library) |
2 | ||
3 | // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands. | |
4 | // Copyright (c) 2008-2012 Bruno Lalande, Paris, France. | |
5 | // Copyright (c) 2009-2012 Mateusz Loskot, London, UK. | |
6 | ||
7 | // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library | |
8 | // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands. | |
9 | ||
10 | // Use, modification and distribution is subject to the Boost Software License, | |
11 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
12 | // http://www.boost.org/LICENSE_1_0.txt) | |
13 | ||
14 | #ifndef BOOST_GEOMETRY_UTIL_ADD_CONST_IF_C_HPP | |
15 | #define BOOST_GEOMETRY_UTIL_ADD_CONST_IF_C_HPP | |
16 | ||
17 | ||
18 | #include <boost/mpl/if.hpp> | |
19 | ||
20 | ||
21 | namespace boost { namespace geometry | |
22 | { | |
23 | ||
24 | ||
25 | /*! | |
26 | \brief Meta-function to define a const or non const type | |
27 | \ingroup utility | |
28 | \details If the boolean template parameter is true, the type parameter | |
29 | will be defined as const, otherwise it will be defined as it was. | |
30 | This meta-function is used to have one implementation for both | |
31 | const and non const references | |
32 | \note This traits class is completely independant from Boost.Geometry | |
33 | and might be a separate addition to Boost | |
34 | \note Used in a.o. for_each, interior_rings, exterior_ring | |
35 | \par Example | |
36 | \code | |
37 | void foo(typename add_const_if_c<IsConst, Point>::type& point) | |
38 | \endcode | |
39 | */ | |
40 | template <bool IsConst, typename Type> | |
41 | struct add_const_if_c | |
42 | { | |
43 | typedef typename boost::mpl::if_c | |
44 | < | |
45 | IsConst, | |
46 | Type const, | |
47 | Type | |
48 | >::type type; | |
49 | }; | |
50 | ||
51 | ||
52 | ||
53 | }} // namespace boost::geometry | |
54 | ||
55 | ||
56 | #endif // BOOST_GEOMETRY_UTIL_ADD_CONST_IF_C_HPP |