...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Moves an iterator a specified distance.
template< typename I, typename M > struct advance { typedef unspecified type; };
Table 1.17. Parameters
Parameter |
Requirement |
Description |
---|---|---|
I |
Model of Forward Iterator |
Iterator to move relative to |
M |
Model of MPL Integral Constant |
Number of positions to move |
result_of::advance<I,M>::type
Return type: A model of the same iterator concept as I.
Semantics: Returns an iterator a distance M from I. If I is a Bidirectional Iterator then M may be negative.
#include <boost/fusion/iterator/advance.hpp> #include <boost/fusion/include/advance.hpp>
typedef vector<int,double,char> vec; typedef result_of::begin<vec>::type first; typedef result_of::next<first>::type second; typedef result_of::next<second>::type third; BOOST_MPL_ASSERT((result_of::equal_to<result_of::advance<first, boost::mpl::int_<2> >::type, third>));