April 01, 2004
STL Sequences & the View Concept
April 04:
Listing 2: Excerpt from the view's interface.
template
<
typename StoredIterator,
class Container = std::vector<StoredIterator>>
class view
{
public:
// iterators for transparent access
typedef view_iterator<typename Container::iterator>
iterator;
typedef view_iterator<typename Container::const_iterator>
const_iterator;
// iterators for raw container traversal
typedef typename Container::iterator
v_iterator;
typedef typename Container::const_iterator
v_const_iterator;
// ...
// iterators:
iterator begin()
{
return iterator(container_.begin());
}
iterator end()
{
return iterator(container_.end());
}
// ...
// raw container iterators:
v_iterator v_begin()
{
return container_.begin();
}
v_iterator v_end()
{
return container_.end();
}
// capacity:
size_type size() const
{
return container_.size();
}
// ...
// element access:
reference operator[](size_type n)
{
return *(container_[n]);
}
// ...
// modifiers:
void push_back(const StoredIterator &i)
{
container_.push_back(i);
}
// ...
private:
Container container_;
};
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