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// Copyright (c) 2001,2004 Utrecht University (The Netherlands),
// ETH Zurich (Switzerland), Freie Universitaet Berlin (Germany),
// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
// and Tel-Aviv University (Israel). All rights reserved.
//
// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; version 2.1 of the License.
// See the file LICENSE.LGPL distributed with CGAL.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL: svn+ssh://scm.gforge.inria.fr/svn/cgal/branches/CGAL-3.2-branch/Interval_arithmetic/include/CGAL/Filtered_kernel.h $
// $Id: Filtered_kernel.h 28908 2006-02-28 15:39:52Z glisse $
//
//
// Author(s) : Sylvain Pion
#ifndef CGAL_FILTERED_KERNEL_H
#define CGAL_FILTERED_KERNEL_H
#include <CGAL/basic.h>
#include <CGAL/Filtered_predicate.h>
#include <CGAL/Cartesian_converter.h>
#include <CGAL/Simple_cartesian.h>
#include <CGAL/Kernel/Type_equality_wrapper.h>
#include <CGAL/MP_Float.h>
#include <CGAL/Quotient.h>
#include <CGAL/Exact_type_selecter.h>
#ifndef CGAL_NO_STATIC_FILTERS
# include <CGAL/Static_filters.h>
#endif
// This file contains the definition of a generic kernel filter.
//
// TODO:
// - at the moment, only the predicates are filtered.
// Constructions will come later.
// - the kernel provides the traits interface, as well as type equality.
// Having the global functions working is another story...
// - The converters are more a property of the types rather than anything else,
// so maybe they should not be passed as template parameter, but use a
// traits-like mecanism ?
CGAL_BEGIN_NAMESPACE
// CK = eventually rebound construction kernel (gets Point_2 from).
// EK = exact kernel called when needed by the filter.
// FK = filtering kernel
template < typename CK >
struct Filtered_kernel_base
: public CK
{
typedef typename Exact_type_selecter<typename CK::RT>::Type Exact_nt;
typedef Simple_cartesian<Exact_nt> EK;
typedef Simple_cartesian<Interval_nt_advanced> FK;
typedef Cartesian_converter<CK, EK> C2E;
typedef Cartesian_converter<CK, FK> C2F;
template < typename Kernel2 >
struct Base {
typedef typename CK::template Base<Kernel2> CK2;
typedef Filtered_kernel_base<CK2> Type;
};
// We change the predicates.
#define CGAL_Kernel_pred(P, Pf) \
typedef Filtered_predicate<typename EK::P, typename FK::P, C2E, C2F> P; \
P Pf() const { return P(); }
// We don't touch the constructions.
#define CGAL_Kernel_cons(Y,Z)
#include <CGAL/Kernel/interface_macros.h>
};
#ifndef CGAL_NO_STATIC_FILTERS
template < typename CK >
struct Static_filters_base
: public Static_filters< Filtered_kernel_base<CK> >
{
template < typename Kernel2 >
struct Base {
typedef typename CK::template Base<Kernel2>::Type CK2;
typedef Static_filters_base<CK2> Type;
};
};
#endif
template < typename CK >
struct Filtered_kernel_adaptor
#ifndef CGAL_NO_STATIC_FILTERS
: public Static_filters_base<CK>
#else
: public Filtered_kernel_base<CK>
#endif
{};
template <class CK>
struct Filtered_kernel
: public Filtered_kernel_adaptor<
Type_equality_wrapper<
typename CK::
#ifndef CGAL_CFG_DEEP_DEPENDENT_TEMPLATE_BUG
template
#endif
Base< Filtered_kernel<CK> >::Type,
Filtered_kernel<CK> > >
{};
// The following is only kept for backward compatibility.
#ifndef CGAL_NO_DEPRECATED_CODE
template < typename CK >
struct Filtered_kernel_without_type_equality
: public Filtered_kernel_adaptor <CK> {};
#endif
CGAL_END_NAMESPACE
#endif // CGAL_FILTERED_KERNEL_H
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