mirror of https://github.com/CGAL/cgal
88 lines
2.0 KiB
C++
88 lines
2.0 KiB
C++
// ======================================================================
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//
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// Copyright (c) 2002 The CGAL Consortium
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//
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// This software and related documentation is part of an INTERNAL release
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// of the Computational Geometry Algorithms Library (CGAL). It is not
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// intended for general use.
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//
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// ----------------------------------------------------------------------
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//
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// release :
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// release_date :
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//
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// file : include/CGAL/Is_a_predicate.h
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// package : Kernel_basic
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// revision : $Revision$
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// revision_date : $Date$
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// author(s) : Sylvain Pion
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//
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// coordinator : MPI, Saarbruecken
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// ======================================================================
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#ifndef CGAL_IS_A_PREDICATE_H
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#define CGAL_IS_A_PREDICATE_H
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// How to determine if a kernel functor is a predicate or a construction.
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#include <CGAL/basic.h>
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#include <CGAL/enum.h>
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CGAL_BEGIN_NAMESPACE
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namespace CGALi {
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// By default it's a construction
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template <typename Return_type>
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struct Return_type_of_predicate {
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typedef CGAL::Tag_false type;
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};
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// Specializations for predicates
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template <>
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struct Return_type_of_predicate<bool> {
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typedef CGAL::Tag_true type;
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};
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template <>
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struct Return_type_of_predicate<CGAL::Sign> {
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typedef CGAL::Tag_true type;
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};
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template <>
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struct Return_type_of_predicate<CGAL::Orientation> {
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typedef CGAL::Tag_true type;
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};
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template <>
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struct Return_type_of_predicate<CGAL::Oriented_side> {
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typedef CGAL::Tag_true type;
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};
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template <>
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struct Return_type_of_predicate<CGAL::Bounded_side> {
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typedef CGAL::Tag_true type;
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};
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template <>
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struct Return_type_of_predicate<CGAL::Comparison_result> {
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typedef CGAL::Tag_true type;
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};
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template <>
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struct Return_type_of_predicate<CGAL::Angle> {
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typedef CGAL::Tag_true type;
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};
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} // namespace CGALi
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template <typename Functor>
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struct Is_a_predicate {
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typedef typename CGALi::Return_type_of_predicate<
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typename Functor::result_type>::type type;
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};
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CGAL_END_NAMESPACE
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#endif // CGAL_IS_A_PREDICATE_H
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