C++ algorithm find_first_of() function
Example
Find one of a number of values in a vector:
vector<int> numbers = {1, 7, 3, 5, 9, 2};
vector<int> search = { 2, 3, 9 };
auto it = find_first_of(numbers.begin(), numbers.end(), search.begin(), search.end());
if (it != numbers.end()) {
cout << "The number " << *it << " was found!";
} else {
cout << "None of the values were found.";
}Definition and Usage
The find_first_of() function returns an iterator pointing to the first occurrence in a data range of any of the specified values. If none of the values are found then it returns the iterator pointing to the end of the data range.
The range of data is specified by iterators. The values to search for are specified by another data range.
Syntax
find_first_of(iterator start, iterator end, iterator values_start, iterator values_end);Parameter Values
| Parameter | Description |
|---|---|
| start | Required. An iterator pointing to the start of the data range being searched. |
| end | Required. An iterator pointing to the end of the data range being searched. Elements up to this position will be searched, but the element at this position will not be included. |
| values_start | Required. An iterator pointing to the start of a data range containing the values to search for. |
| values_end | Required. An iterator pointing to the end of a data range containing the values to search for. |
Technical Details
| Returns: | An iterator pointing to the first occurrence in the data range of any of the specified values, or the end of the data range if none of the values were found. |
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Related Pages
Read more about data structures in our Data Structures Tutorial.
Read more about iterators in our Iterators Tutorial.
Read more about algorithms in our Algorithms Tutorial.
