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/** \file
* Defines the various functors and interfaces used for KDTree.
*
* \author Martin F. Krafft <libkdtree@pobox.madduck.net>
* \author Sylvain Bougerel <sylvain.bougerel.devel@gmail.com>
*/
#ifndef INCLUDE_KDTREE_ACCESSOR_HPP
#define INCLUDE_KDTREE_ACCESSOR_HPP
#include <cstddef>
namespace KDTree
{
template <typename _Val>
struct _Bracket_accessor
{
typedef typename _Val::value_type result_type;
result_type
operator()(_Val const& V, size_t const N) const
{
return V[N];
}
};
template <typename _Tp>
struct always_true
{
bool operator() (const _Tp& ) const { return true; }
};
template <typename _Tp, typename _Dist>
struct squared_difference
{
typedef _Dist distance_type;
distance_type
operator() (const _Tp& __a, const _Tp& __b) const
{
distance_type d=__a - __b;
return d*d;
}
};
template <typename _Tp, typename _Dist>
struct squared_difference_counted
{
typedef _Dist distance_type;
squared_difference_counted()
: _M_count(0)
{ }
void reset ()
{ _M_count = 0; }
long&
count () const
{ return _M_count; }
distance_type
operator() (const _Tp& __a, const _Tp& __b) const
{
distance_type d=__a - __b;
++_M_count;
return d*d;
}
private:
mutable long _M_count;
};
} // namespace KDTree
#endif // include guard
/* COPYRIGHT --
*
* This file is part of libkdtree++, a C++ template KD-Tree sorting container.
* libkdtree++ is (c) 2004-2007 Martin F. Krafft <libkdtree@pobox.madduck.net>
* and Sylvain Bougerel <sylvain.bougerel.devel@gmail.com> distributed under the
* terms of the Artistic License 2.0. See the ./COPYING file in the source tree
* root for more information.
*
* THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES
* OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
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