// Boost.Geometry (aka GGL, Generic Geometry Library)
|
|
// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
|
// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
|
// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
|
|
// This file was modified by Oracle on 2014-2020.
|
// Modifications copyright (c) 2014-2020 Oracle and/or its affiliates.
|
// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
|
|
// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
|
// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
|
|
// 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_UTIL_SELECT_CALCULATION_TYPE_HPP
|
#define BOOST_GEOMETRY_UTIL_SELECT_CALCULATION_TYPE_HPP
|
|
|
#include <boost/geometry/util/select_coordinate_type.hpp>
|
|
|
namespace boost { namespace geometry
|
{
|
|
|
/*!
|
\brief Meta-function selecting the "calculation" type
|
\details Based on two input geometry types, and an input calculation type,
|
(which defaults to void in the calling function), this meta-function
|
selects the most appropriate:
|
- if calculation type is specified, that one is used,
|
- if it is void, the most precise of the two points is used
|
\ingroup utility
|
*/
|
template <typename Geometry1, typename Geometry2, typename CalculationType>
|
struct select_calculation_type
|
{
|
typedef std::conditional_t
|
<
|
std::is_void<CalculationType>::value,
|
typename select_coordinate_type
|
<
|
Geometry1,
|
Geometry2
|
>::type,
|
CalculationType
|
> type;
|
};
|
|
// alternative version supporting more than 2 Geometries
|
template
|
<
|
typename CalculationType,
|
typename ...Geometries
|
>
|
struct select_calculation_type_alt
|
{
|
typedef std::conditional_t
|
<
|
std::is_void<CalculationType>::value,
|
typename select_coordinate_type
|
<
|
Geometries...
|
>::type,
|
CalculationType
|
> type;
|
};
|
|
|
}} // namespace boost::geometry
|
|
|
#endif // BOOST_GEOMETRY_UTIL_SELECT_CALCULATION_TYPE_HPP
|
