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##### replace_copy_if

###### Prototype

    template<class ForwardRange, class OutputIterator, class UnaryPredicate, class Value>
    OutputIterator replace_copy_if(const ForwardRange& rng, OutputIterator out,
                                   UnaryPredicate pred, const Value& with_what);

###### Description

`replace_copy_if` copy every element `x` in `rng` such that the corresponding element in the output range `y` is `pred(x) ? with_what : x`.

###### Definition

Defined in the header file `boost/range/algorithm/replace_copy_if.hpp`

###### Requirements

- `ForwardRange` is a model of the Forward Range Concept.
- `ForwardRange` is mutable.
- `Value` is convertible to `ForwardRange`'s value type.
- `Value` is a model of the `AssignableConcept`.
- `OutputIterator` is a model of the `OutputIteratorConcept`.
- `UnaryPredicate` is a model of the `UnaryPredicateConcept`.

###### Complexity

Linear. `replace_copy_if` performs exactly `distance(rng)` evaluations of `pred`.