std::experimental::ranges::find_end (3) - Linux Manuals

std::experimental::ranges::find_end: std::experimental::ranges::find_end

NAME

std::experimental::ranges::find_end - std::experimental::ranges::find_end

Synopsis

Defined in header <experimental/ranges/algorithm>
template< ForwardIterator I1, Sentinel<I1> S1, ForwardIterator I2, Sentinel<I2> S2,
class Proj = ranges::identity,
IndirectRelation<I2, projected<I1, Proj>> Pred = ranges::equal_to<> > (1) (ranges TS)
I1 find_end(I1 first1, S1 last1, I2 first2, S2 last2,
Pred pred = Pred{}, Proj proj = Proj{});
template< ForwardRange R1, ForwardRange R2, class Proj = ranges::identity,
IndirectRelation<ranges::iterator_t<R2>,
projected<ranges::iterator_t<R1>, Proj>> Pred = ranges::equal_to<> > (2) (ranges TS)
ranges::safe_iterator_t<R1> find_end(Rng1&& rng1, Rng2&& rng2,
Pred pred = Pred{}, Proj proj = Proj{});

1) Searches for the last occurrence of the sequence [first2, last2) in the range [first1, last1) (after projection with proj).
2) Same as (1), but uses r1 as the first source range and r2 as the second source range, as if using ranges::begin(r1) as first1, ranges::end(r1) as last1, ranges::begin(r2) as first2, and ranges::end(r2) as last2.
Notwithstanding the declarations depicted above, the actual number and order of template parameters for algorithm declarations is unspecified. Thus, if explicit template arguments are used when calling an algorithm, the program is probably non-portable.

Parameters

first1, last1 - the range of elements to examine
r1 - the range of elements to examine
first2, last2 - the range of elements to search for
r2 - the range of elements to search for
pred - predicate to compare the elements
proj - projection to apply to the elements in the first range

Return value

Iterator to the beginning of last occurrence of the sequence [first2, last2) in range [first1, last1) (after projection with proj).
If [first2, last2) is empty or if no such sequence is found, an iterator that compares equal to last1 is returned.

Complexity

At most S*(N-S+1) applications of the predicate and projection, where S = last2 - first2 and N = last1 - first1.

Notes

The projection is only applied to the range [first1, last1).

Possible implementation

  template< ForwardIterator I1, Sentinel<I1> S1, ForwardIterator I2, Sentinel<I2> S2,
            class Proj = ranges::identity,
            IndirectRelation<I2, projected<I1, Proj>> Pred = ranges::equal_to<> >
  I1 find_end(I1 first1, S1 last1, I2 first2, S2 last2,
              Pred pred = Pred{}, Proj proj = Proj{})
  {
      I1 result = ranges::next(first1, last1);
      if (first2 == last2)
          return result;
      while (true) {
          I1 new_result = ranges::search(first1, last1, first2, last2, pred, proj);
          if (new_result == last1) {
              break;
          } else {
              result = new_result;
              first1 = result;
              ++first1;
          }
      }
      return result;
  }

Example

 This section is incomplete
 Reason: no example