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Added counting_iterator_generator; updated comments

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[SVN r8928]
This commit is contained in:
Dave Abrahams
2001-02-04 19:38:28 +00:00
parent 93b54c15c8
commit 90299982a6
1 changed files with 22 additions and 9 deletions
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31
include/boost/counting_iterator.hpp
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@ -4,7 +4,7 @@
// without express or implied warranty, and with no claim as to its suitability // without express or implied warranty, and with no claim as to its suitability
// for any purpose. // for any purpose.
// //
// See http://www.boost.org for most recent version including documentation. // See http://www.boost.org for most recent version including documentation.
// //
// Supplies: // Supplies:
// //
@ -15,16 +15,21 @@
// value progresses through consecutive values of Incrementable when the // value progresses through consecutive values of Incrementable when the
// iterator is derferenced. // iterator is derferenced.
// //
// template <class Incrementable> struct counting_iterator_generator;
//
// A "type generator" whose nested type "type" is a counting iterator as
// described above.
//
// template <class Incrementable> // template <class Incrementable>
// iterator_adaptor<Incrementable, // typename counting_iterator_generator<Incrementable>::type
// counting_iterator_policies<Incrementable>, // counting_iterator(Incrementable);
// counting_iterator_traits<Incrementable> >
// counting_iterator(Incrementable);
// //
// A function which produces an adapted counting iterator over values of // A function which produces an adapted counting iterator over values of
// Incrementable. // Incrementable.
// //
// Revision History // Revision History
// 04 Feb 2001 Added counting_iterator_generator; updated comments
// (David Abrahams)
// 24 Jan 2001 initial revision, based on Jeremy Siek's // 24 Jan 2001 initial revision, based on Jeremy Siek's
// boost/pending/integer_range.hpp (David Abrahams) // boost/pending/integer_range.hpp (David Abrahams)
@ -33,7 +38,7 @@
# include <boost/config.hpp> # include <boost/config.hpp>
# include <boost/detail/iterator.hpp> # include <boost/detail/iterator.hpp>
# include <boost/pending/iterator_adaptors.hpp> # include <boost/iterator_adaptors.hpp>
# include <boost/type_traits.hpp> # include <boost/type_traits.hpp>
# include <boost/detail/numeric_traits.hpp> # include <boost/detail/numeric_traits.hpp>
# ifndef BOOST_NO_LIMITS # ifndef BOOST_NO_LIMITS
@ -161,11 +166,18 @@ struct counting_iterator_policies : public default_iterator_policies
} }
}; };
// A type generator for counting iterators
template <class Incrementable>
struct counting_iterator_generator
{
typedef iterator_adaptor<Incrementable,
counting_iterator_policies<Incrementable>,
counting_iterator_traits<Incrementable> > type;
};
// Manufacture a counting iterator for an arbitrary incrementable type // Manufacture a counting iterator for an arbitrary incrementable type
template <class Incrementable> template <class Incrementable>
inline iterator_adaptor<Incrementable, inline typename counting_iterator_generator<Incrementable>::type
counting_iterator_policies<Incrementable>,
counting_iterator_traits<Incrementable> >
counting_iterator(Incrementable x) counting_iterator(Incrementable x)
{ {
return iterator_adaptor<Incrementable, return iterator_adaptor<Incrementable,
@ -173,6 +185,7 @@ counting_iterator(Incrementable x)
counting_iterator_traits<Incrementable> >(x); counting_iterator_traits<Incrementable> >(x);
} }
} // namespace boost } // namespace boost
#endif // BOOST_COUNTING_ITERATOR_HPP_DWA20000119 #endif // BOOST_COUNTING_ITERATOR_HPP_DWA20000119