CGAL::Circulator_from_container< C > Class Template Reference

#include <CGAL/circulator.h>

Definition

template<typename C>
class CGAL::Circulator_from_container< C >

The adaptor Circulator_from_container provides a circulator for an STL container C of equal category as the iterator provided by the container.

The iterator must be at least of the forward iterator category. The corresponding non-mutable circulator is called Const_circulator_from_container<C>.

The container type C is supposed to conform to the STL requirements for container (i.e. to have a begin() and an end() iterator as well as the local types reference, const_reference, value_type, size_type, and difference_type).

Types

All types required for circulators are provided.

Operations

The adaptor conforms to the requirements of the corresponding circulator category. An additional member function current_iterator() returns the current iterator pointing to the same position as the circulator does.

See also

Container_from_circulator

Circulator_from_iterator

Circulator

Example

The following program composes two adaptors - from a container to a circulator and back to an iterator. It applies an STL sort algorithm on a STL vector with three elements. The resulting vector will be [2 5 9] as it is checked by the assertions. The program is part of the CGAL distribution.

File Circulator/circulator_prog2.cpp

#include <cassert>
#include <vector>
#include <algorithm>
#include <CGAL/circulator.h>
 
typedef CGAL::Circulator_from_container< std::vector<int> >  Circulator;
typedef CGAL::Container_from_circulator<Circulator>          Container;
typedef Container::iterator                                  Iterator;
 
int main() {
    std::vector<int> v;
    v.push_back(5);
    v.push_back(2);
    v.push_back(9);
    Circulator c( &v);
    Container  container( c);
    std::sort( container.begin(), container.end());
    Iterator i = container.begin();
    assert( *i == 2);
    i++;    assert( *i == 5);
    i++;    assert( *i == 9);
    i++;    assert(  i == container.end());
    return 0;
}

Examples

Circulator/circulator_prog2.cpp.

Creation
	Circulator_from_container ()
	a circulator c on an empty sequence.
	Circulator_from_container (C *container)
	a circulator c initialized to refer to the first element in container, i.e. container.begin().
	Circulator_from_container (C *container, C::iterator i)
	a circulator c initialized to refer to the element *i in container.

Constructor & Destructor Documentation

Circulator_from_container() [1/2]

template<typename C >

CGAL::Circulator_from_container< C >::Circulator_from_container

(

C *

container

)

a circulator c initialized to refer to the first element in container, i.e. container.begin().

The circulator c refers to an empty sequence if the container is empty.

Circulator_from_container() [2/2]

template<typename C >

CGAL::Circulator_from_container< C >::Circulator_from_container	(	C *	container,
		C::iterator	i
	)

a circulator c initialized to refer to the element *i in container.

Precondition

*i is dereferenceable and refers to container.