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cgal/Arrangement_2/include/CGAL/Arr_point_location/Td_dag.h

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// Copyright (c) 1997 Tel-Aviv University (Israel).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org); you may redistribute it under
// the terms of the Q Public License version 1.0.
// See the file LICENSE.QPL distributed with CGAL.
//
// 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.
//
// $URL$
// $Id$
//
//
// Author(s) : Iddo Hanniel <hanniel@math.tau.ac.il>
// Oren Nechushtan <theoren@math.tau.ac.il>
/* Directed acyclic binary graph template class */
#ifndef CGAL_TD_DAG_H
#define CGAL_TD_DAG_H
#include <CGAL/basic.h>
#include <CGAL/number_utils.h>
#include <CGAL/kernel_assertions.h>
#include <CGAL/Handle.h>
#include <cstdlib>
#include <iostream>
#include <list>
#include <functional>
CGAL_BEGIN_NAMESPACE
template<class T>
class Td_dag_base : public Handle
{
public: //iddo (for CC-7.2) maybe protected?
typedef T * pointer;
typedef T & reference;
typedef const T & const_reference;
protected:
void init() { PTR = 0; }
public:
Td_dag_base() {init();}
Td_dag_base(const Td_dag_base<T> & x) : Handle(x) {}
Td_dag_base & operator=(const Td_dag_base<T> & x)
{Handle::operator=(x); return *this; }
bool operator!() const { return PTR == 0; }
};
template<class T>
class Td_dag : public Td_dag_base<T>
{
public:
typedef T* pointer;
typedef T& reference;
typedef const T& const_reference;
typedef Td_dag_base<T> Td_dag_handle;
typedef Td_dag<T> Self;
typedef std::list<pointer> list_pointer;
#ifndef CGAL_CFG_USING_BASE_MEMBER_BUG_2
public:
using Td_dag_handle::PTR;
using Td_dag_handle::operator!;
#endif
protected:
class node : public Rep
{
#ifndef __BORLANDC__
friend class Td_dag<T>;
#else
typedef Td_dag<T> Td_dag;
friend class Td_dag;
#endif
public:
node(const T& e,unsigned long _depth=0) :
data(e),leftPtr(),rightPtr(),depth_(_depth){}
node(const T& e, const Td_dag_handle& left,
const Td_dag_handle& right,unsigned long _depth=0) :
data(e),leftPtr(left),rightPtr(right),depth_(_depth){}
// node(const T& e) : data(e),leftPtr(),rightPtr(){}
// node(const T& e, const Td_dag_handle& left,
// const Td_dag_handle& right) : data(e),leftPtr(left),rightPtr(right) {}
~node(){}
bool is_inner_node() const {return !!leftPtr && !!rightPtr;}
bool visited() const {return visited_;}
protected:
T data; // information stored in node
Td_dag_handle leftPtr,rightPtr;
mutable unsigned long depth_;
mutable bool visited_;
};
public:
/* -------constructors destructors -----*/
Td_dag(){}
Td_dag(const Td_dag_handle& dag):Td_dag_handle(dag){}
Td_dag(const Self& dag):Td_dag_handle(dag){}
Td_dag(const T& rootValue){PTR = new node(rootValue);}
Td_dag(const T& rootValue, const Self& left, const Self& right)
{PTR = new node(rootValue, left, right); rebalance_depth();}
~Td_dag(){}
/* --------information retrieval -------*/
const Self& left() const
{
CGAL_precondition(!operator!());
return *(const Self*)&ptr()->leftPtr;
}
const Self& right() const
{
CGAL_precondition(!operator!());
return *(const Self*)&ptr()->rightPtr;
}
reference get_data() const
{
CGAL_precondition(!operator!());
return ptr()->data;
}
reference operator*() const
{
return get_data();
}
pointer get_data_ptr() const
{
CGAL_precondition(!operator!());
return &operator*();
}
pointer operator->() const
{
return get_data_ptr();
}
bool is_inner_node() const
{return !operator!() && ptr()->is_inner_node();}
unsigned long size() const
{
visit_none();
return recursive_size();
}
unsigned long depth() const
{
visit_none();
return recursive_depth();
}
bool operator==(const Self& b) const
{
return PTR==b.PTR;
}
bool operator!=(const Self& b) const
{
return !operator==(b);
}
/* dynamic management ---------*/
/* description:
Shallow copy */
Self& operator=(const Self& b)
{
Handle::operator=(b);
return *this;
}
/*
Self& deep_copy(const Self& b)
{
if (this != &b)
{
clear();
operator=(b);
}
return *this;
}
void clear()
{
if (!operator!())
{
left().clear();
right().clear();
operator=(Self());
}
}
void detach_left()
{
if (!operator!())
{
// create dummy Td_dag
T tmp;
Self dummy(tmp);
// detach left son,redirect to dummy
set_left(dummy);
// set left son pointer to 0
ptr()->leftPtr.PTR=0;
// delete dummy Td_dag
delete dummy.ptr();
}
}
void detach_right()
{
if (!operator!())
{
// create dummy Td_dag
T tmp;
Self dummy(tmp);
// detach right son,redirect to dummy
set_right(dummy);
// set right son pointer to 0
ptr()->rightPtr.PTR=0;
// delete dummy Td_dag
delete dummy.ptr();
}
}
void detach()
{
detach_left();
detach_right();
}
*/
void set_data(const T& data)
{
if (!operator!()) ptr()->data=data;
else operator=(Self(data));
}
void set_depth(unsigned long _depth) const
{
ptr()->depth_=_depth;
}
void set_left(const Self& left)
{
CGAL_precondition(!operator!());
ptr()->leftPtr=left;
if (left.depth()<depth()+1) left.ptr()->depth_=depth()+1;
left.rebalance_depth();
// does nothing if right is a leaf
}
void set_right(const Self& right)
{
CGAL_precondition(!operator!());
ptr()->rightPtr=right;
if (right.depth()<depth()+1) right.ptr()->depth_=depth()+1;
right.rebalance_depth();
// does nothing if right is a leaf
}
void replace(const T& data,const Self& left,const Self& right)
{
set_data(data);
set_left(left);
set_right(right);
}
// Td_dag implementation not thread safe!
void visit_none() const
{
if (!operator!())
{
ptr()->visited_=false;
left().visit_none();
right().visit_none();
}
}
void visit_one() const
{
if (!operator!())
ptr()->visited_=true;
}
/* -----output ---------------*/
#ifdef CGAL_PRE_IN_POST_ORDER
void preorder() const
{
if (!operator!())
{
std::cout << operator*() << '\t';
left().preorder();
right().preorder();
}
}
void inorder() const
{
if (!operator!())
{
left().inorder();
std::cout << operator*() << '\t';
right().inorder();
}
}
void postorder() const
{
if (!operator!())
{
left().postorder();
right().postorder();
std::cout << operator*() << '\t';
}
}
#endif
#if _MSC_VER>=1100
friend std::ostream& operator<<(std::ostream& out, const Self& t);
#endif
template <class Container,class Predicate>
Container& filter(Container& c,const Predicate& pr) const
{
visit_none();
return recursive_filter(c,pr);
}
#if 0
template <class Container,class Predicate>
Container& hash_filter(Container& c,const Predicate& pr) const
{
visit_none();
return recursive_hash_filter(c,pr);
}
#endif
protected:
void rebalance_depth() const
{
if (is_inner_node())
{
unsigned long depth_=depth();
if (left().depth()<depth_+1)
{
left().set_depth(depth_+1);
left().rebalance_depth();
}
if (right().depth()<depth_+1)
{
right().set_depth(depth_+1);
right().rebalance_depth();
}
}
}
unsigned long recursive_size() const
{
if (!operator!() && !ptr()->visited())
return 1+left().recursive_size()+right().recursive_size();
else
return 0;
}
unsigned long recursive_depth() const
{
if (!operator!() && !ptr()->visited())
return 1+ std::max(left().recursive_depth(),right().recursive_depth());
else
return 0;
}
template <class Container,class Predicate>
Container& recursive_filter(Container& c,const Predicate& pr) const
{
if (!operator!() && !ptr()->visited())
{
if (pr(operator*()))
c.insert(c.end(),operator*());
visit_one();
left().recursive_filter(c,pr);
right().recursive_filter(c,pr);
}
return c;
}
#if 0
template <class Container, class Predicate>
Container& recursive_hash_filter(Container& c, const Predicate& ptr) const
/* Generate a copy of the Dag filtered according to the predicate */
{
if (!operator!() && !ptr()->visited())
{
if (pr(operator*()))
c.insert(pair<&operator*(), new X_trapezoid(operator*()));
// The hash links between the old trapezoid to the new one.
visit_one();
left().recursive_hash_filter(c,pr);
right().recursive_hash_filter(c,pr);
}
return c;
}
#endif
private:
node* ptr() const {return (node*)PTR;}
};
template<class T,class Traits>
std::ostream& write(std::ostream& out,
const Td_dag<T>& t,
const Traits& traits)
{
static int depth;
int i;
if (!!t) {
out << "\n";
for(i=0;i<depth;i++)out << ">";
out << "Data=";
write(out,*t,traits);
{
depth++;
out << "\n";
for(i=0;i<depth;i++)out << ">";
out << "left=";
write(out,t.left(),traits);
out << "\n";
for(i=0;i<depth;i++)out << ">";
out << "right=";
write(out,t.right(),traits);
depth--;
}
}
else
{
out << "Empty";
}
return out ;
}
template<class T> std::ostream& operator<<(std::ostream& out,
const Td_dag<T>& t)
{
static int depth;
int i;
if (!!t) {
out << "\n";
for(i=0;i<depth;i++)out << ">";
out << "Data=" << *t;
{
depth++;
out << "\n";
for(i=0;i<depth;i++)out << ">";
out << "left=" << t.left();
out << "\n";
for(i=0;i<depth;i++)out << ">";
out << "right=" <<t.right();
depth--;
}
}
else
{
out << "Empty";
}
return out ;
}
CGAL_END_NAMESPACE
#endif
/*
tech notes:
The code is Handle designed.
left(),right() are designed to cope with Handle(Handle& x)
precondition x.PTR!=0
operator=() performs shallow copy
operator*() returns data type
output is done as a binary tree.
*/
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