NAME¶

std::experimental::ranges::search - std::experimental::ranges::search

Synopsis¶

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 > (1) (ranges TS)
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{});
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>, (2) (ranges TS)
Pred, Proj1, Proj2>
ranges::safe_iterator_t<R1> search(R1&& r1, R2&& r2, Pred pred =
Pred{},

Proj1 proj1 = Proj1{}, Proj2 proj2 = Proj2{});

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 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;
}
}
}
}

Example¶

This section is incomplete
Reason: no example

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)
find finds the first element satisfying specific criteria
find_if (function template)
find_if_not
returns true if one range is lexicographically less than
lexicographical_compare another
(function template)
mismatch finds the first position where two ranges differ
(function template)
searches for a number consecutive copies of an element in a
search_n range
(function template)