| [section:replace_if replace_if] |
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| [heading Prototype] |
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| `` |
| template<class ForwardRange, class UnaryPredicate, class Value> |
| ForwardRange& replace_if(ForwardRange& rng, UnaryPredicate pred, const Value& with_what); |
| |
| template<class ForwardRange, class UnaryPredicate, class Value> |
| const ForwardRange& replace_if(const ForwardRange& rng, UnaryPredicate pred, const Value& with_what); |
| `` |
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| [heading Description] |
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| `replace_if` replaces every element `x` in `rng` for which `pred(x) == true` with `with_what`. Returns a reference to `rng`. |
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| [heading Definition] |
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| Defined in the header file `boost/range/algorithm/replace_if.hpp` |
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| [heading Requirements] |
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| * `ForwardRange` is a model of the __forward_range__ Concept. |
| * `ForwardRange` is mutable. |
| * `UnaryPredicate` is a model of the `PredicateConcept` |
| * `ForwardRange`'s value type is convertible to `UnaryPredicate`'s argument type. |
| * `Value` is convertible to `ForwardRange`'s value type. |
| * `Value` is a model of the `AssignableConcept`. |
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| [heading Complexity] |
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| Linear. `replace_if` performs exactly `distance(rng)` applications of `pred`, and at most `distance(rng)` assignments. |
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| [endsect] |
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