Boost C++ Libraries: Ticket #4296: has_iterator, has_const_iterator metafunctions

attachment set

tomas.puverle@… — Fri, 04 Jun 2010 17:31:27 GMT

attachment → boost.range.zip

A patch for boost range with two new metafunctions and a test case.

Steven Watanabe — Fri, 11 Jun 2010 16:32:02 GMT

This would be better implemented as

BOOST_MPL_HAS_XXX_TRAIT_DEF(type);
template<class T>
struct has_iterator : has_type<boost::range_iterator<T> > {};
template<class T>
struct has_const_iterator : has_type<boost::range_const_iterator<T> > {};

status changed

Neil Groves — Sun, 14 Nov 2010 17:46:20 GMT

status new → assigned

status, milestone changed; resolution set

Neil Groves — Thu, 23 Dec 2010 18:14:14 GMT

status assigned → closed
resolution → fixed
milestone Boost 1.44.0 → Boost 1.46.0

I have implemented a solution based primarily on stevens suggestion since using BOOST_MPL_HAS_XX_TRAIT_DEF improves compiler support.

I have chosen to implement this using enable_if to select a base class since this works better on many compilers (due to the base class being dependent on the template parameters) than the snippet posted above.