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Boost.Range |
filtered
rng | 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