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// Copyright (c) 2003,2004 INRIA Sophia-Antipolis (France) and
// Notre Dame University (U.S.A.). All rights reserved.
//
// This file is part of CGAL (www.cgal.org); you may redistribute it under
// the terms of the Q Public License version 1.0.
// See the file LICENSE.QPL 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-3.5-branch/Segment_Delaunay_graph_2/include/CGAL/Filtered_construction.h $
// $Id: Filtered_construction.h 46439 2008-10-23 12:23:18Z afabri $
//
//
// Author(s) : Menelaos Karavelas <mkaravel@cse.nd.edu>
#ifndef CGAL_FILTERED_CONSTRUCTION_H
#define CGAL_FILTERED_CONSTRUCTION_H
#include <CGAL/basic.h>
#include <CGAL/Interval_arithmetic.h>
CGAL_BEGIN_NAMESPACE
template <class AC, class EC, class FC, class C2E, class C2F,
class E2C, class F2C, bool Protection = true>
class Filtered_construction
{
private:
EC Exact_construction;
FC Filter_construction;
C2E To_Exact;
C2F To_Filtered;
E2C From_Exact;
F2C From_Filtered;
typedef typename AC::result_type AC_result_type;
typedef typename FC::result_type FC_result_type;
typedef typename EC::result_type EC_result_type;
public:
typedef AC_result_type result_type;
public:
Filtered_construction() {}
template <class A1>
result_type
operator()(const A1 &a1) const
{
// Protection is outside the try block as VC8 has the CGAL_CFG_FPU_ROUNDING_MODE_UNWINDING_VC_BUG
Protect_FPU_rounding<Protection> P1;
try
{
return From_Filtered( Filter_construction(To_Filtered(a1)) );
}
catch (Uncertain_conversion_exception)
{
Protect_FPU_rounding<!Protection> P(CGAL_FE_TONEAREST);
return From_Exact( Exact_construction(To_Exact(a1)) );
}
}
template <class A1, class A2>
result_type
operator()(const A1 &a1, const A2 &a2) const
{
Protect_FPU_rounding<Protection> P1;
try
{
return From_Filtered( Filter_construction(To_Filtered(a1),
To_Filtered(a2)) );
}
catch (Uncertain_conversion_exception)
{
Protect_FPU_rounding<!Protection> P(CGAL_FE_TONEAREST);
return From_Exact( Exact_construction(To_Exact(a1),
To_Exact(a2)) );
}
}
template <class A1, class A2, class A3>
result_type
operator()(const A1 &a1, const A2 &a2, const A3 &a3) const
{
Protect_FPU_rounding<Protection> P1;
try
{
return From_Filtered( Filter_construction(To_Filtered(a1),
To_Filtered(a2),
To_Filtered(a3)) );
}
catch (Uncertain_conversion_exception)
{
Protect_FPU_rounding<!Protection> P(CGAL_FE_TONEAREST);
return From_Exact( Exact_construction(To_Exact(a1),
To_Exact(a2),
To_Exact(a3)) );
}
}
};
CGAL_END_NAMESPACE
#endif // CGAL_FILTERED_CONSTRUCTION_H
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