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Boost.Range |
replaced_if
rng | boost::adaptors::replaced_if( pred, new_value )boost::make_replaced_if_range( rng, pred, new_value )
pred
.
new_value
is convertible to the value-type
of the range.
[x]
in the returned range, the value
x
is equal to the value of
pred(y) ? new_value : y
where y
is the corresponding element in the original
range.
#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