/usr/include/dune/grid/onedgrid/onedgridlist.hh is in libdune-grid-dev 2.5.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_ONEDGRID_LIST_HH
#define DUNE_ONEDGRID_LIST_HH
#include <dune/common/iteratorfacades.hh>
namespace Dune {
/** \file
\brief A simple doubly-linked list needed in OneDGrid
\todo I'd love to get rid of this and use std::list instead.
Unfortunately, there are problems. I need to store pointers/iterators
within one element which point to another element (e.g. the element father).
*/
template<class T>
class OneDGridListIterator
: public BidirectionalIteratorFacade<OneDGridListIterator<T>,T>
{
public:
bool equals(const OneDGridListIterator& other) const {
return pointer_ == other.pointer_;
}
T& dereference() {
return *pointer_;
}
void increment() {
pointer_ = pointer_->succ_;
}
void decrement() {
pointer_ = pointer_->pred_;
}
OneDGridListIterator() {}
OneDGridListIterator(T* pointer) {
pointer_ = pointer;
}
OneDGridListIterator operator=(T* pointer) {
pointer_ = pointer;
}
operator T*() {return pointer_;}
private:
T* pointer_;
};
template<class T>
class OneDGridList
{
public:
typedef T* iterator;
typedef const T* const_iterator;
OneDGridList() : numelements(0), begin_(0), rbegin_(0) {}
int size() const {return numelements;}
iterator push_back (const T& value) {
T* i = rbegin();
// New list element by copy construction
T* t = new T(value);
// einfuegen
if (begin_==0) {
// insert in empty list
begin_ = t;
rbegin_ = t;
}
else
{
// insert after element i
t->pred_ = i;
t->succ_ = i->succ_;
i->succ_ = t;
if (t->succ_!=0)
t->succ_->pred_ = t;
// new tail?
if (rbegin_==i)
rbegin_ = t;
}
// adjust size, return iterator
numelements = numelements+1;
return t;
}
iterator insert (iterator i, const T& value) {
// Insert before 'one-after-the-end' --> append to the list
if (i==end())
return push_back(value);
// New list element by copy construction
T* t = new T(value);
// insert
if (begin_==0)
{
// insert in empty list
begin_=t;
rbegin_=t;
}
else
{
// insert before element i
t->succ_ = i;
t->pred_ = i->pred_;
i->pred_ = t;
if (t->pred_!=0)
t->pred_->succ_ = t;
// new head?
if (begin_==i)
begin_ = t;
}
// adjust size, return iterator
numelements = numelements+1;
return t;
}
void erase (iterator& i)
{
// test argument
if (i==0)
return;
// handle pointers to predecessor and succesor
if (i->succ_!=0)
i->succ_->pred_ = i->pred_;
if (i->pred_!=0)
i->pred_->succ_ = i->succ_;
// head & tail
if (begin_==i)
begin_=i->succ_;
if (rbegin_==i)
rbegin_ = i->pred_;
// adjust size
numelements = numelements-1;
// Actually delete the object
delete(i);
}
iterator begin() {
return begin_;
}
const_iterator begin() const {
return begin_;
}
iterator end() {
return NULL;
}
const_iterator end() const {
return NULL;
}
iterator rbegin() {
return rbegin_;
}
const_iterator rbegin() const {
return rbegin_;
}
private:
int numelements;
T* begin_;
T* rbegin_;
}; // end class OneDGridList
} // namespace Dune
#endif
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