advance

advance_c

Description

Moves an iterator by a specified distance.

Synopsis

template<
    typename I,
    int N
    >
struct advance_c
{
    typedef unspecified type;
};

Table 1.18. Parameters

Parameter	Requirement	Description
`I`	Model of Forward Iterator	Iterator to move relative to
`N`	Integer constant	Number of positions to move

Expression Semantics

result_of::advance_c<I, N>::type

Return type: A model of the same iterator concept as I.

Semantics: Returns an iterator a distance N from I. If I is a Bidirectional Iterator then N may be negative. Equivalent to result_of::advance<I, boost::mpl::int_<N> >::type.

Header

#include <boost/fusion/iterator/advance.hpp>

Example

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_c<first, 2>::type, third>));