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Boost.Range |
filteredrng | boost::adaptors::filtered( pred )boost::make_filtered_range( rng, pred )
pred.
x in the returned range,
pred(x) is true
#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, ","));
return 0;
}
This would produce the output:
2,4,6,8
(C) Copyright Neil Groves 2009 (C) Copyright Thorsten Ottosen 2003-2004