`Description`

`Description`

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```*Find_first_of* is similar to *find*, in that it performs linear seach through a range of Input Iterators. The difference is that while *find *searches for one particular value, *find_first_of* searches for any of several values. Specifically, *find_first_of* searches for the first occurrance in the range *[first1, last1)* of any of the elements in *[first2, last2)*. (Note that this behavior is reminiscent of the function *strpbrk* from the standard C library.)

The two versions of *find_first_of* differ in how they compare elements for equality. The first uses *operator==*, and the second uses and arbitrary user-supplied function object *comp*. The first version returns the first iterator *i* in *[first1, last1)* such that, for some iterator *j* in *[first2, last2)*, **i == *j*. The second returns the first iterator *i* in *[first1, last1)* such that, for some iterator *j* in *[first2, last2)*, *comp(*i, *j)* is *true*. As usual, both versions return *last1* if no such iterator *i* exists.