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// Copyright (c) 1999
// Utrecht University (The Netherlands),
// ETH Zurich (Switzerland),
// INRIA Sophia-Antipolis (France),
// Max-Planck-Institute Saarbruecken (Germany),
// 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; either version 3 of the License,
// or (at your option) any later version.
//
// 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/next/STL_Extension/include/CGAL/tags.h $
// $Id: tags.h 67336 2012-01-20 15:01:53Z sloriot $
//
//
// Author(s) : Stefan Schirra
#ifndef CGAL_TAGS_H
#define CGAL_TAGS_H
#include <CGAL/IO/io_tags.h>
#include <boost/config.hpp>
namespace CGAL {
struct Void {};
// Two struct's to denote boolean compile time decisions.
template <bool b>
struct Boolean_tag {
static const bool value = b;
};
typedef Boolean_tag<true> Tag_true;
typedef Boolean_tag<false> Tag_false;
// the function check_tag is deprecated since CGAL 3.3
inline bool check_tag( Tag_true) {return true;}
inline bool check_tag( Tag_false) {return false;}
struct Null_tag {};
struct Null_functor {
typedef Null_tag result_type;
typedef Null_tag second_argument_type;
};
// A function that asserts a specific compile time tag
// forcing its two arguments to have equal type.
// It is encapsulated with #ifdef since it will be defined also elsewhere.
// ======================================================
#ifndef CGAL_ASSERT_COMPILE_TIME_TAG
#define CGAL_ASSERT_COMPILE_TIME_TAG 1
template <class Base>
struct Assert_tag_class
{
void match_compile_time_tag( const Base&) const {}
};
template <class Tag, class Derived>
inline
void
Assert_compile_time_tag( const Tag&, const Derived& b)
{
Assert_tag_class<Tag> x;
x.match_compile_time_tag(b);
}
#endif // CGAL_ASSERT_COMPILE_TIME_TAG
template < class T>
inline
void
assert_equal_types( const T&, const T&) {}
} //namespace CGAL
#endif // CGAL_TAGS_H
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