[section:replace replace]

[heading Prototype]

``
template<
    class ForwardRange,
    class Value
    >
ForwardRange& replace(ForwardRange& rng, const Value& what, const Value& with_what);

template<
    class ForwardRange,
    class UnaryPredicate
    >
const ForwardRange& replace(const ForwardRange& rng, const Value& what, const Value& with_what);
``

[heading Description]

`replace` every element in `rng` equal to `what` with `with_what`. Return a reference to `rng`.

[heading Definition]

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

[heading 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`.
* `Value` is a model of the `EqualityComparableConcept`, and may be compared for equality with objects of `ForwardRange`'s value type.

[heading Complexity]

Linear. `replace` performs exactly `distance(rng)` comparisons for equality and at most `distance(rng)` assignments.

[endsect]