Boost.Range

Range Adaptors


replaced_if

rng | boost::adaptors::replaced_if( pred, new_value )
boost::make_replaced_if_range( rng, pred, new_value )

Example

        #include <boost/range/adaptor/replaced_if.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::adaptors;
            using namespace boost::assign;
            
            std::vector<int> input;
            input += 1,2,3,4,5,6,7,8,9;
            
            boost::copy(
                input | replaced_if(is_even(), 10),
                std::ostream_iterator<int>(std::cout, ","));
                
            return 0;
        }
        
    

This produces the output:
1,10,3,10,5,10,7,10,9


(C) Copyright Neil Groves 2009 (C) Copyright Thorsten Ottosen 2003-2004