156 lines
3.8 KiB
C++
Executable File
156 lines
3.8 KiB
C++
Executable File
// Copyright (c) 2009-2014 INRIA Sophia-Antipolis (France).
|
|
// 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
|
|
// 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.
|
|
//
|
|
// $URL$
|
|
// $Id$
|
|
// SPDX-License-Identifier: GPL-3.0+
|
|
//
|
|
// Author(s) : Samuel Hornus
|
|
|
|
#ifndef CGAL_INTERNAL_COMBINATION_ENUMERATOR_H
|
|
#define CGAL_INTERNAL_COMBINATION_ENUMERATOR_H
|
|
|
|
#include <CGAL/license/Triangulation.h>
|
|
|
|
#include <CGAL/disable_warnings.h>
|
|
|
|
#include <CGAL/basic.h>
|
|
#include <vector>
|
|
|
|
namespace CGAL {
|
|
|
|
namespace internal {
|
|
|
|
class Combination_enumerator
|
|
{
|
|
// types and member data
|
|
typedef std::vector<int> Combination;
|
|
Combination combi_;
|
|
const int k_;
|
|
const int min_;
|
|
const int max_;
|
|
const int max_at_pos_0_;
|
|
|
|
public:
|
|
|
|
// For generating all the combinations of |k| distinct elements in the
|
|
// interval [min, max] (both included)
|
|
Combination_enumerator(const int k, const int min, const int max)
|
|
: combi_(k), k_(k), min_(min), max_(max), max_at_pos_0_(max + 1 - k)
|
|
{
|
|
CGAL_assertion_msg( min <= max, "min is larger than max");
|
|
CGAL_assertion_msg( 1 <= k && k <= ( max - min + 1 ), "wrong value of k");
|
|
init();
|
|
}
|
|
|
|
Combination_enumerator(const Combination_enumerator & c)
|
|
: combi_(c.combi_), k_(c.k_), min_(c.min_), max_(c.max_), max_at_pos_0_(c.max_at_pos_0_)
|
|
{}
|
|
|
|
int number_of_elements()
|
|
{
|
|
return k_;
|
|
}
|
|
|
|
void init()
|
|
{
|
|
combi_.resize(k_);
|
|
for( int i = 0; i < k_; ++i )
|
|
element(i) = min_ + i;
|
|
}
|
|
|
|
bool end() const
|
|
{
|
|
return ( element(0) > max_at_pos_0_ );
|
|
}
|
|
|
|
int element(const int i) const
|
|
{
|
|
CGAL_assertion( 0 <= i && i < k_ );
|
|
return combi_[i];
|
|
}
|
|
|
|
int & element(const int i)
|
|
{
|
|
CGAL_assertion( 0 <= i && i < k_ );
|
|
return combi_[i];
|
|
}
|
|
|
|
int operator[](const int i) const
|
|
{
|
|
return element(i);
|
|
}
|
|
|
|
int & operator[](const int i)
|
|
{
|
|
return element(i);
|
|
}
|
|
|
|
void operator++()
|
|
{
|
|
int i = k_ - 1;
|
|
int max_at_pos_i(max_);
|
|
while( ( i >= 0 ) && ( element(i) >= max_at_pos_i ) )
|
|
{
|
|
--i;
|
|
--max_at_pos_i;
|
|
}
|
|
if( -1 == i )
|
|
{
|
|
if( element(0) == max_at_pos_0_ )
|
|
++element(0); // mark then end of the enumeration with an impossible value
|
|
// Note than when we have arrived at the end of the enumeration, applying
|
|
// operator++() again does not change anything, so it is safe to
|
|
// apply it too many times.
|
|
}
|
|
else
|
|
{
|
|
++element(i);
|
|
for( int j = i + 1; j < k_; ++j )
|
|
element(j) = element(i) + j - i;
|
|
}
|
|
}
|
|
|
|
Combination_enumerator operator++(int)
|
|
{
|
|
Combination_enumerator tmp(*this);
|
|
++(*this);
|
|
return tmp;
|
|
}
|
|
|
|
// - - - - - - - - - - - - - - - - - - - - - - - - - - - TESTING
|
|
#if 0
|
|
void test()
|
|
{
|
|
std::cerr << '\n';
|
|
while( ! end() )
|
|
{
|
|
std::cerr << '\n';
|
|
for( int i = 0; i < k_; ++i )
|
|
std::cerr << element(i) << ' ';
|
|
++(*this);
|
|
}
|
|
init();
|
|
}
|
|
#endif
|
|
};
|
|
|
|
} // end of namespace internal
|
|
|
|
} // end of namespace CGAL
|
|
|
|
#include <CGAL/enable_warnings.h>
|
|
|
|
#endif // CGAL_INTERNAL_COMBINATION_ENUMERATOR_H
|