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Diffstat (limited to 'boost/geometry/index/detail/algorithms/diff_abs.hpp')
| -rw-r--r-- | boost/geometry/index/detail/algorithms/diff_abs.hpp | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/boost/geometry/index/detail/algorithms/diff_abs.hpp b/boost/geometry/index/detail/algorithms/diff_abs.hpp new file mode 100644 index 0000000000..ec63bd9a5d --- /dev/null +++ b/boost/geometry/index/detail/algorithms/diff_abs.hpp @@ -0,0 +1,39 @@ +// Boost.Geometry Index +// +// Abs of difference +// +// Copyright (c) 2011-2013 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 +// http://www.boost.org/LICENSE_1_0.txt) + +#ifndef BOOST_GEOMETRY_INDEX_DETAIL_ALGORITHMS_DIFF_ABS_HPP +#define BOOST_GEOMETRY_INDEX_DETAIL_ALGORITHMS_DIFF_ABS_HPP + +namespace boost { namespace geometry { namespace index { namespace detail { + +template <typename T> +inline T diff_abs_dispatch(T const& v1, T const& v2, boost::mpl::bool_<true> const& /*is_integral*/) +{ + return v1 < v2 ? v2 - v1 : v1 - v2; +} + +template <typename T> +inline T diff_abs_dispatch(T const& v1, T const& v2, boost::mpl::bool_<false> const& /*is_integral*/) +{ + return ::fabs(v1 - v2); +} + +template <typename T> +inline T diff_abs(T const& v1, T const& v2) +{ + typedef boost::mpl::bool_< + boost::is_integral<T>::value + > is_integral; + return diff_abs_dispatch(v1, v2, is_integral()); +} + +}}}} // namespace boost::geometry::index::detail + +#endif // BOOST_GEOMETRY_INDEX_DETAIL_ALGORITHMS_DIFF_ABS_HPP |