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#if ! defined _Section_h
#define _Section_h 1
/*
Section of an existing collection viewed as a collection
*/
#include <basic/Collection.h>
#include <assert.h>
namespace omega {
template<class T> class Section_Iterator;
template <class T> class Section : public Sequence<T> {
public:
Section(Sequence<T> *, int start, int length);
Iterator<T> *new_iterator();
const T &operator[](int) const;
T &operator[](int);
int index(const T &) const;
int size() const;
friend class Section_Iterator<T>;
private:
Sequence<T> *it;
int _start, _length;
};
template <class T> class Section_Iterator : public Iterator<T> {
public:
Section_Iterator(Section<T> &sec);
virtual ~Section_Iterator() { delete it; }
const T & operator*() const { return *(*it); }
T & operator*() { return *(*it); }
void operator++(int);
void operator++();
bool live() const;
Iterator<T> *new_copy() const;
private:
Section_Iterator(const Section_Iterator<T> &si);
Iterator<T> *it;
int remaining;
};
} // namespace
#define instantiate_Section(T) template class Section<T>; \
template class Section_Iterator<T>; \
instantiate_Sequence(T)
#define instantiate_Section_Iterator(T) instantiate_Section(T)
namespace omega {
template <class T> Section<T>::Section(Sequence<T> *s, int start, int length)
{
assert(s->size() >= start-1 + length);
it = s;
_start = start;
_length = length;
}
template <class T> Iterator<T> *Section<T>::new_iterator()
{
return new Section_Iterator<T>(*this);
}
template <class T> const T &Section<T>::operator[](int i) const
{
assert(1 <= i && i <= size());
return (*it)[i+(_start-1)];
}
template <class T> T &Section<T>::operator[](int i)
{
assert(1 <= i && i <= size());
return (*it)[i+(_start-1)];
}
template <class T> int Section<T>::index(const T &var) const
{
int i;
for (i=1; i<=size(); i++)
if ((*this)[i] == var)
return i;
return 0;
}
template <class T> int Section<T>::size() const
{
return _length;
}
template <class T> Section_Iterator<T>::Section_Iterator(Section<T> &sec)
{
it = sec.it->new_iterator();
for (int i = 1; i < sec._start; i++)
(*it)++;
remaining = sec.size();
}
template <class T> Section_Iterator<T>::Section_Iterator(const Section_Iterator<T> &si) : it(si.it), remaining(si.remaining) {}
template <class T> void Section_Iterator<T>::operator++()
{ this->operator++(0); }
template <class T> void Section_Iterator<T>::operator++(int)
{
if (remaining > 0)
{
(*it)++;
remaining--;
}
}
template <class T> bool Section_Iterator<T>::live() const
{
return (remaining > 0);
}
template <class T> Iterator<T> *Section_Iterator<T>::new_copy() const
{
return new Section_Iterator<T>(*this);
}
} // namespace
#endif
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