diff options
Diffstat (limited to 'boost/geometry/index/detail/meta.hpp')
| -rw-r--r-- | boost/geometry/index/detail/meta.hpp | 67 |
1 files changed, 65 insertions, 2 deletions
diff --git a/boost/geometry/index/detail/meta.hpp b/boost/geometry/index/detail/meta.hpp index bec1380b06..10118ade7c 100644 --- a/boost/geometry/index/detail/meta.hpp +++ b/boost/geometry/index/detail/meta.hpp @@ -1,6 +1,6 @@ // Boost.Geometry Index // -// Copyright (c) 2011-2013 Adam Wulkiewicz, Lodz, Poland. +// Copyright (c) 2011-2019 Adam Wulkiewicz, Lodz, Poland. // // Use, modification and distribution is subject to the Boost Software License, // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at @@ -10,7 +10,8 @@ #include <boost/mpl/aux_/has_type.hpp> #include <boost/mpl/if.hpp> #include <boost/mpl/and.hpp> -//#include <boost/type_traits/is_convertible.hpp> +#include <boost/type_traits/is_convertible.hpp> +#include <boost/type_traits/is_same.hpp> #ifndef BOOST_GEOMETRY_INDEX_DETAIL_META_HPP #define BOOST_GEOMETRY_INDEX_DETAIL_META_HPP @@ -37,6 +38,68 @@ struct is_range // : is_range_of_convertible_values_impl<T, V, is_range<T>::value> //{}; +// Implemented this way in order to prevent instantiation of all type traits at +// once because some of them are causing problems with gcc 4.6 namely +// is_convertible<bg::model::segment<>, std::pair<bg::model::segment<>, T> > +// because segment<> is derived from pair<> and pair<> has copy ctor taking +// other pair<> of any types the compiler tries to instantiate ctor of +// pair<segment, T> taking pair<point, point> which results in instantiation of +// segment's ctor taking a point which results in compilation error. +// This is probably compiler's bug. +template <typename T, typename Value, typename Indexable, typename ResultType, int Ver> +struct convertible_type_impl +{ + typedef ResultType type; +}; + +template <typename T, typename Value, typename Indexable> +struct convertible_type_impl<T, Value, Indexable, void, 0> +{ + typedef typename boost::mpl::if_c + < + boost::is_convertible<T, Indexable>::value, + Indexable, + void + >::type result_type; + + typedef typename convertible_type_impl + < + T, Value, Indexable, result_type, 1 + >::type type; +}; + +template <typename T, typename Value, typename Indexable> +struct convertible_type_impl<T, Value, Indexable, void, 1> +{ + typedef typename boost::mpl::if_c + < + boost::is_convertible<T, Value>::value, + Value, + void + >::type type; +}; + +template <typename T, typename Value, typename Indexable> +struct convertible_type +{ + typedef typename boost::mpl::if_c + < + boost::is_same<T, Value>::value, + Value, + typename boost::mpl::if_c + < + boost::is_same<T, Indexable>::value, + Indexable, + void + >::type + >::type result_type; + + typedef typename convertible_type_impl + < + T, Value, Indexable, result_type, 0 + >::type type; +}; + }}}} // namespace boost::geometry::index::detail #endif // BOOST_GEOMETRY_INDEX_DETAIL_META_HPP |