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map_keys
map_keys example

Syntax

Code

Pipe

rng | boost::adaptors::map_keys

Function

boost::adaptors::keys(rng)

#include <boost/range/adaptor/map.hpp>
#include <boost/range/algorithm/copy.hpp>
#include <boost/assign.hpp>
#include <iterator>
#include <iostream>
#include <map>
#include <vector>

int main(int argc, const char* argv[])
{
    using namespace boost::assign;
    using namespace boost::adaptors;

    std::map<int,int> input;
    for (int i = 0; i < 10; ++i)
        input.insert(std::make_pair(i, i * 10));

    boost::copy(
        input | map_keys,
        std::ostream_iterator<int>(std::cout, ","));

    return 0;
}

This would produce the output:

0,1,2,3,4,5,6,7,8,9,


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