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46 lines
1.4 KiB
46 lines
1.4 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_STRATEGIES_DEFAULT_LENGTH_RESULT_HPP |
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#define BOOST_GEOMETRY_STRATEGIES_DEFAULT_LENGTH_RESULT_HPP |
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#include <boost/geometry/core/coordinate_type.hpp> |
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#include <boost/geometry/util/select_most_precise.hpp> |
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namespace boost { namespace geometry |
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{ |
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/*! |
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\brief Meta-function defining return type of length function |
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\ingroup length |
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\note Length of a line of integer coordinates can be double. |
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So we take at least a double. If Big Number types are used, |
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we take that type. |
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*/ |
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template <typename Geometry> |
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struct default_length_result |
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{ |
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typedef typename select_most_precise |
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< |
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typename coordinate_type<Geometry>::type, |
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long double |
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>::type type; |
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}; |
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}} // namespace boost::geometry |
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#endif // BOOST_GEOMETRY_STRATEGIES_DEFAULT_LENGTH_RESULT_HPP
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