127 lines
4.6 KiB
C++
127 lines
4.6 KiB
C++
// Copyright (c) 1997
|
|
// 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)
|
|
//
|
|
// $URL: https://github.com/CGAL/cgal/blob/v5.1/Circulator/include/CGAL/circulator_bases.h $
|
|
// $Id: circulator_bases.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
|
|
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
|
|
//
|
|
//
|
|
// Author(s) : Lutz Kettner <kettner@inf.ethz.ch>
|
|
|
|
#ifndef CGAL_CIRCULATOR_BASES_H
|
|
#define CGAL_CIRCULATOR_BASES_H 1
|
|
|
|
#include <cstddef>
|
|
#include <iterator>
|
|
|
|
namespace CGAL {
|
|
|
|
struct Circulator_tag {}; // any circulator.
|
|
struct Iterator_tag {}; // any iterator.
|
|
|
|
// conversion operators instead of inheritance to avoid ambiguous
|
|
// bases. we have to repeat all possible conversion so we don't run
|
|
// into a multiple user-defined conversions, problem.
|
|
|
|
struct Forward_circulator_tag
|
|
: public std::forward_iterator_tag
|
|
{};
|
|
|
|
struct Bidirectional_circulator_tag
|
|
: public std::bidirectional_iterator_tag
|
|
{
|
|
operator Forward_circulator_tag() const { return Forward_circulator_tag(); }
|
|
};
|
|
|
|
struct Random_access_circulator_tag
|
|
: public std::random_access_iterator_tag
|
|
{
|
|
operator Bidirectional_circulator_tag() const { return Bidirectional_circulator_tag(); }
|
|
operator Forward_circulator_tag() const { return Forward_circulator_tag(); }
|
|
};
|
|
|
|
template <typename Tag, typename T, typename Distance = std::ptrdiff_t,
|
|
/* size is so awkwardly placed to faciliate using the
|
|
* default arguments from the derived classes */
|
|
typename Size = std::size_t, typename Pointer = T*,
|
|
typename Reference = T&>
|
|
struct Circulator_base {
|
|
typedef Tag iterator_category;
|
|
typedef T value_type;
|
|
typedef Distance difference_type;
|
|
typedef Pointer pointer;
|
|
typedef Reference reference;
|
|
typedef Size size_type;
|
|
};
|
|
|
|
template <class T, class Dist = std::ptrdiff_t, class Size = std::size_t>
|
|
struct Forward_circulator_base
|
|
: Circulator_base<Forward_circulator_tag, T, Dist, Size> {};
|
|
|
|
template <class T, class Dist = std::ptrdiff_t, class Size = std::size_t>
|
|
struct Bidirectional_circulator_base
|
|
: Circulator_base<Bidirectional_circulator_tag, T, Dist, Size> {};
|
|
|
|
template <class T, class Dist = std::ptrdiff_t, class Size = std::size_t>
|
|
struct Random_access_circulator_base
|
|
: Circulator_base<Random_access_circulator_tag, T, Dist, Size> {};
|
|
|
|
// variant base classes
|
|
// ---------------------
|
|
template <class T, class Dist = std::ptrdiff_t, class Size = std::size_t>
|
|
class Forward_circulator_ptrbase // forward circulator.
|
|
{
|
|
protected:
|
|
void* _ptr;
|
|
public:
|
|
typedef Forward_circulator_tag iterator_category;
|
|
typedef T value_type;
|
|
typedef Dist difference_type;
|
|
typedef Size size_type;
|
|
typedef T* pointer;
|
|
typedef T& reference;
|
|
Forward_circulator_ptrbase() : _ptr(nullptr) {}
|
|
Forward_circulator_ptrbase(void* p) : _ptr(p) {}
|
|
};
|
|
template <class T, class Dist = std::ptrdiff_t, class Size = std::size_t>
|
|
class Bidirectional_circulator_ptrbase // bidirectional circulator.
|
|
{
|
|
protected:
|
|
void* _ptr;
|
|
public:
|
|
typedef Bidirectional_circulator_tag iterator_category;
|
|
typedef T value_type;
|
|
typedef Dist difference_type;
|
|
typedef Size size_type;
|
|
typedef T* pointer;
|
|
typedef T& reference;
|
|
Bidirectional_circulator_ptrbase() : _ptr(nullptr) {}
|
|
Bidirectional_circulator_ptrbase(void* p) : _ptr(p) {}
|
|
};
|
|
template <class T, class Dist = std::ptrdiff_t, class Size = std::size_t>
|
|
class Random_access_circulator_ptrbase // random access circulator.
|
|
{
|
|
protected:
|
|
void* _ptr;
|
|
public:
|
|
typedef Random_access_circulator_tag iterator_category;
|
|
typedef T value_type;
|
|
typedef Dist difference_type;
|
|
typedef Size size_type;
|
|
typedef T* pointer;
|
|
typedef T& reference;
|
|
Random_access_circulator_ptrbase() : _ptr(nullptr) {}
|
|
Random_access_circulator_ptrbase(void* p) : _ptr(p) {}
|
|
};
|
|
|
|
} //namespace CGAL
|
|
|
|
#endif // CGAL_CIRCULATOR_BASES_H //
|
|
// EOF //
|