Category: algorithms | Component type: function |
template <class InputIterator, class ForwardIterator> InputIterator find_first_of(InputIterator first1, InputIterator last1, ForwardIterator first2, ForwardIterator last2); template <class InputIterator, class ForwardIterator, class BinaryPredicate> InputIterator find_first_of(InputIterator first1, InputIterator last1, ForwardIterator first2, ForwardIterator last2, BinaryPredicate comp);
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.
int main() { const char* WS = "\t\n "; const int n_WS = strlen(WS); char* s1 = "This sentence contains five words."; char* s2 = "OneWord"; char* end1 = find_first_of(s1, s1 + strlen(s1), WS, WS + n_WS); char* end2 = find_first_of(s2, s2 + strlen(s2), WS, WS + n_WS); printf("First word of s1: %.*s\n", end1 - s1, s1); printf("First word of s2: %.*s\n", end2 - s2, s2); }
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