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Boost.Range |
indexedrng | boost::adaptors::indexedboost::make_indexed_range( rng )
index() member function that returns the appropriate
index for the element in the sequence corresponding with the
iterator.
#include <boost/range/adaptor/indexed.hpp>
#include <boost/range/algorithm/copy.hpp>
#include <boost/assign.hpp>
#include <algorithm>
#include <iostream>
#include <vector>
template<class Iterator>
void display_element_and_index(Iterator first, Iterator last)
{
for (Iterator it = first; it != last; ++it)
{
std::cout << "Element = " << *it
<< " Index = " << it.index() << std::endl;
}
}
template<class SinglePassRange>
void display_element_and_index(const SinglePassRange& rng)
{
display_element_and_index(boost::begin(rng), boost::end(rng));
}
int main(int argc, const char* argv[])
{
using namespace boost::assign;
using namespace boost::adaptors;
std::vector<int> input;
input += 10,20,30,40,50,60,70,80,90;
display_element_and_index( input | indexed(0) );
return 0;
}
This produces the output:
Element = 10 Index = 0
Element = 20 Index = 1
Element = 30 Index = 2
Element = 40 Index = 3
Element = 50 Index = 4
Element = 60 Index = 5
Element = 70 Index = 6
Element = 80 Index = 7
Element = 90 Index = 8
(C) Copyright Neil Groves 2009 (C) Copyright Thorsten Ottosen 2003-2004