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##### find_first_of

###### Prototype

    template<class SinglePassRange1, class ForwardRange2>
    typename range_iterator<SinglePassRange1>::type
    find_first_of(SinglePassRange1& rng1, const ForwardRange2& rng2);

    template<
        class SinglePassRange1,
        class ForwardRange2,
        class BinaryPredicate
        >
    typename range_iterator<SinglePassRange1>::type
    find_first_of(SinglePassRange1& rng1, const ForwardRange2& rng2, BinaryPredicate pred);

    template<
        range_return_value re,
        class SinglePassRange1,
        class ForwardRange2
        >
    typename range_return<SinglePassRange1, re>::type
    find_first_of(SinglePassRange1& rng1, const ForwardRange2& rng2);

    template<
        range_return_value re,
        class SinglePassRange1,
        class ForwardRange2,
        class BinaryPredicate
        >
    typename range_return<SinglePassRange1, re>::type
    find_first_of(SinglePassRange1& rng1, const ForwardRange2& rng2, BinaryPredicate pred);

###### Description

The versions of `find_first_of` that return an iterator, return an iterator to the first occurrence in `rng1` of any of the elements in `rng2`. Equality is determined by `operator==` for non-predicate versions of `find_first_of`, and by satisfying `pred` in the predicate versions.

The versions of `find_first_of` that return a `range_return`, defines `found` in the same manner as the returned iterator described above.

###### Definition

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

###### Requirements

For the non-predicate versions:

- `SinglePassRange1` is a model of the Single Pass Range Concept.
- `ForwardRange2` is a model of the Forward Range Concept.
- `SinglePassRange1`'s value type is a model of the `EqualityComparableConcept`, and can be compared for equality with `ForwardRange2`'s value type.

For the predicate versions:

- `SinglePassRange1` is a model of the Single Pass Range Concept.
- `ForwardRange2` is a model of the Forward Range Concept.
- `BinaryPredicate` is a model of the `BinaryPredicateConcept`.
- `SinglePassRange1`'s value type is convertible to `BinaryPredicate`'s first argument type.
- `ForwardRange2`'s value type is convertible to `BinaryPredicate`'s second argument type.

###### Complexity

At most `distance(rng1) * distance(rng2)` comparisons.