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value_type of the range is convertible
to the argument type of pred.
[x] in the returned range, pred(x)
is true.
pred might throw.
boost::filtered_range<typeof(rng)>
rng
and Bidirectional
Range
#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