Files
range/doc/reference/adaptors/replaced_if.qbk
Neil Groves b0d1db7c2e Boost.RangeEx merged into Boost.Range
[SVN r60897]
2010-03-28 16:08:35 +00:00

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[section:replaced_if replaced_if]
[table
[[Syntax] [Code]]
[[Pipe] [`rng | boost::adaptors::replaced_if(pred, new_value)`]]
[[Function] [`boost::adaptors::replace_if(rng, pred, new_value)`]]
]
* [*Precondition:]
* The range `value_type` is convertible to the argument type of `pred`.
* `new_value` is convertible to the `value_type` of the range.
* [*Postconditions:] For all elements `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.
* [*Range Category:] `ForwardRange`
[section:replaced_if_example replaced_if 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;
}
``
[endsect]
This would produce the output:
``
1,10,3,10,5,10,7,10,9
``
[endsect]