std::experimental::ranges::search

 

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Technical specifications

Filesystem library (filesystem TS)

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Ranges

Concepts

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Ranges

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Algorithms library

Non-modifying sequence operations
all_ofany_ofnone_of countcount_if	findfind_iffind_if_not find_end find_first_of	adjacent_find search search_n mismatch	equal for_each lexicographical_compare
Modifying sequence operations
copycopy_if copy_n copy_backward move move_backward	fill fill_n generate generate_n swap_ranges shuffle transform	removeremove_if replacereplace_if reverse rotate unique	remove_copyremove_copy_if replace_copyreplace_copy_if reverse_copy rotate_copy unique_copy
Partitioning operations
is_partitioned partition_point	partition partition_copy	stable_partition
Sorting operations
is_sorted is_sorted_until	sort stable_sort	partial_sort partial_sort_copy	nth_element
Binary search operations
lower_bound	upper_bound	binary_search	equal_range
Set operations (on sorted ranges)
merge inplace_merge	includes	set_difference set_intersection	set_symmetric_difference set_union
Heap operations
is_heap is_heap_until	make_heap sort_heap	push_heap pop_heap
Minimum/maximum operations
max max_element	min min_element	minmax minmax_element
Permutations
is_permutation	next_permutation	prev_permutation

 

Defined in header <experimental/ranges/algorithm>
template< ForwardIterator I1, Sentinel<I1> S1,           ForwardIterator I2, Sentinel<I2> S2, class Pred = ranges::equal_to<>,           class Proj1 = ranges::identity, class Proj2 = ranges::identity >     requires IndirectlyComparable<I1, I2, Pred, Proj1, Proj2> I1 search( I1 first1, S1 last1, I2 first2, S2 last2,            Pred pred = Pred{}, Proj1 proj1 = Proj1{}, Proj2 proj2 = Proj2{} );	(1)	(ranges TS)
template< ForwardRange R1, ForwardRange R2, class Pred = ranges::equal_to<>,           class Proj1 = ranges::identity, class Proj2 = ranges::identity >     requires IndirectlyComparable<ranges::iterator_t<R1>, ranges::iterator_t<R2>,                                   Pred, Proj1, Proj2> ranges::safe_iterator_t<R1> search( R1&& r1, R2&& r2, Pred pred = Pred{},                                     Proj1 proj1 = Proj1{}, Proj2 proj2 = Proj2{} );	(2)	(ranges TS)

1) Searches for the first occurrence of the sequence of elements [first2, last2) in the range [first1, last1). Elements are compared using pred after being projected with proj2 and proj1, respectively.

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 apply to the projected elements
proj1	-	projection to apply to the elements in the first range
proj2	-	projection to apply to the elements in the second range

Return value

An iterator to the beginning of first occurrence of the sequence [first2, last2) in the range [first1, last1). If [first2, last2) is empty, first1 is returned. If no such occurrence is found, an iterator that compares equal to last1 is returned.

Complexity

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

Possible implementation

template<ForwardIterator I1, Sentinel<I1> S1, ForwardIterator I2, Sentinel<I2> S2, class Pred = ranges::equal_to<>, class Proj1 = ranges::identity, class Proj2 = ranges::identity> requires IndirectlyComparable<I1, I2, Pred, Proj1, Proj2> I1 search(I1 first1, S1 last1, I2 first2, S2 last2, Pred pred = Pred{}, Proj1 proj1 = Proj1{}, Proj2 proj2 = Proj2{}) { for (; ; ++first1) { I1 it = first1; for (I2 it2 = first2; ; (void)++it, (void)++it2) { if (it2 == last2) return first1; if (it == last1) return it; if (!ranges::invoke(pred, ranges::invoke(proj1, *it), ranges::invoke(proj2, *it2))) break; } } }

See also

search	searches for a range of elements (function template)
find_end	finds the last sequence of elements in a certain range (function template)
includes	returns true if one set is a subset of another (function template)
equal	determines if two sets of elements are the same (function template)
findfind_iffind_if_not	finds the first element satisfying specific criteria (function template)
lexicographical_compare	returns true if one range is lexicographically less than another (function template)
mismatch	finds the first position where two ranges differ (function template)
search_n	searches for a number consecutive copies of an element in a range (function template)