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Boost.Range |
replaced_ifrng | 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