...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 1.18. Parameters
Parameter |
Requirement |
Description |
---|---|---|
|
Model of Forward Iterator |
Iterator to move relative to |
|
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>
typedefvector
<int,double,char> vec; typedefresult_of::begin
<vec>::type first; typedefresult_of::next
<first>::type second; typedefresult_of::next
<second>::type third; BOOST_MPL_ASSERT((result_of::equal_to
<result_of::advance
<first, boost::mpl::int_<2> >::type, third>));