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filtered
filtered example

Syntax

Code

Pipe

rng | boost::adaptors::filtered(pred)

Function

boost::adaptors::filter(rng, pred)

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

struct is_even
{
    bool operator()( int x ) const { return x % 2 == 0; }
};

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

    std::vector<int> input;
    input += 1,2,3,4,5,6,7,8,9;

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

This would produce the output:

2,4,6,8


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