20 General utilities library [utilities]

20.14 Function objects [function.objects]

20.14.17 Searchers [func.search]

20.14.17.1 Class template default_­searcher [func.search.default]

template<class ForwardIterator1, class BinaryPredicate = equal_to<>>
  class default_searcher {
  public:
    constexpr default_searcher(ForwardIterator1 pat_first, ForwardIterator1 pat_last,
                               BinaryPredicate pred = BinaryPredicate());

    template<class ForwardIterator2>
      constexpr pair<ForwardIterator2, ForwardIterator2>
        operator()(ForwardIterator2 first, ForwardIterator2 last) const;

  private:
    ForwardIterator1 pat_first_;        // exposition only
    ForwardIterator1 pat_last_;         // exposition only
    BinaryPredicate pred_;              // exposition only
  };
🔗
constexpr default_searcher(ForwardIterator pat_first, ForwardIterator pat_last, BinaryPredicate pred = BinaryPredicate());
1
#
Effects: Constructs a default_­searcher object, initializing pat_­first_­ with pat_­first, pat_­last_­ with pat_­last, and pred_­ with pred.
2
#
Throws: Any exception thrown by the copy constructor of BinaryPredicate or ForwardIterator1.
🔗
template<class ForwardIterator2> constexpr pair<ForwardIterator2, ForwardIterator2> operator()(ForwardIterator2 first, ForwardIterator2 last) const;
3
#
Effects: Returns a pair of iterators i and j such that
  • (3.1)
    i == search(first, last, pat_­first_­, pat_­last_­, pred_­), and
  • (3.2)
    if i == last, then j == last, otherwise j == next(i, distance(pat_­first_­, pat_­last_­)).