Functor: Select

Classes
struct	Select1st< Pair >
	Functor for selecting the first element of a pair. More...
struct	Select2nd< Pair >
	Functor for selecting the second element of a pair. More...
struct	SelectElement< Sequence, N >
	Functor for selecting an element of a sequence. More...
Functions
template<class Pair >
Select1st< Pair >	select_1st ()
	Convenience function for constructing a Select1st.
template<class Pair >
Select2nd< Pair >	select_2nd ()
	Convenience function for constructing a Select2nd.
template<class Sequence , int N>
SelectElement< Sequence, N >	select_element ()
	Convenience function for constructing a SelectElement.

---

Detailed Description

The SGI extensions provide functors for selecting the first and second elements of a std::pair. This functionality is implemented here to avoid dependence on the extensions.

The SelectElement functor selects the n_th element of a sequence.