79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
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// Copyright (c) 2017 GeometryFactory (France).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org)
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/Kernel_23/include/CGAL/Has_conversion.h $
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// $Id: Has_conversion.h 52164b1 2019-10-19T15:34:59+02:00 Sébastien Loriot
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// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
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//
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// Author(s) : Mael Rouxel-Labbé
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#ifndef CGAL_HAS_CONVERSION_H
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#define CGAL_HAS_CONVERSION_H
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#include <CGAL/Cartesian_converter.h>
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#include <CGAL/Homogeneous_converter.h>
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#include <CGAL/representation_tags.h>
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namespace CGAL {
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namespace internal {
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template<typename K1, typename K2, typename Rep = typename K1::Rep_tag /* Cartesian_tag */>
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struct Converter_selector
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{
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CGAL_static_assertion_msg((boost::is_same<typename K1::Rep_tag,
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typename K2::Rep_tag>::value),
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"Kernels must have the same representation");
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typedef CGAL::Cartesian_converter<K1, K2> type;
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};
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template<typename K1, typename K2>
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struct Converter_selector<K1, K2, Homogeneous_tag>
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{
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CGAL_static_assertion_msg((boost::is_same<typename K1::Rep_tag,
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typename K2::Rep_tag>::value),
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"Kernels must have the same representation");
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typedef CGAL::Homogeneous_converter<K1, K2> type;
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};
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} // namespace internal
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/// Check whether Cartesian/Homogeneous_converter<K1, K2> provides either
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/// of the following conversions:
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///
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/// -- K2T operator()(const K1T& ) const
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/// -- const K2T& operator()(const K1T& ) const
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///
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/// \pre K1 and K2 are kernels with the same representation tag
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/// \pre K1T is a typedef in K1
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/// \pre K2T is a typedef in K2
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template<typename K1, typename K2, typename K1T, typename K2T>
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class Has_conversion
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{
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typedef char one;
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typedef struct { char arr[2]; } two;
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template<typename U, U>
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struct Wrapper { };
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template<typename CC, typename T1, typename T2>
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static one test(Wrapper<T2 (CC::*)(const T1&) const, &CC::operator()>*);
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template<typename CC, typename T1, typename T2>
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static one test(Wrapper<const T2& (CC::*)(const T1&) const, &CC::operator()>*);
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template<typename CC, typename T1, typename T2>
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static two test(...);
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public:
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static const bool value =
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sizeof(test<typename internal::Converter_selector<K1, K2>::type, K1T, K2T >(0)) == 1;
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};
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} // namespace CGAL
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#endif // CGAL_HAS_CONVERSION_H
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