std:: default_searcher
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Defined in header
<functional>
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template
<
class
ForwardIt,
class
BinaryPredicate
=
std::
equal_to
<>
>
class default_searcher ; |
(since C++17) | |
A class suitable for use with Searcher overload of std::search that delegates the search operation to the pre-C++17 standard library's std::search .
std::default_searcher
is
CopyConstructible
and
CopyAssignable
.
Member functions
std::default_searcher:: default_searcher
default_searcher
(
ForwardIt pat_first,
ForwardIt pat_last,
|
(since C++17)
(constexpr since C++20) |
|
Constructs a
std::default_searcher
by storing copies of
pat_first
,
pat_last
, and
pred
.
Parameters
pat_first, pat_last | - | a pair of iterators designating the string to be searched for |
pred | - | a callable object used to determine equality |
Exceptions
Any exceptions thrown by the copy constructors of
BinaryPredicate
or
ForwardIt
.
std::default_searcher:: operator()
template
<
class
ForwardIt2
>
std::
pair
<
ForwardIt2, ForwardIt2
>
|
(since C++17)
(constexpr since C++20) |
|
The member function called by the Searcher overload of std::search to perform a search with this searcher.
Returns a pair of iterators
i, j
, where
i
is
std::
search
(
first, last, pat_first, pat_last, pred
)
and
j
is
std::
next
(
i,
std::
distance
(
pat_first, pat_last
)
)
unless
std::search
returned
last
(no match), in which case
j
equals
last
as well.
Parameters
first, last | - | a pair of iterators designating the string to be examined |
Return value
A pair of iterators to the first and one past last positions in
[
first
,
last
)
where a subsequence that compares equal to
[
pat_first
,
pat_last
)
as defined by
pred
is located, or a pair of copies of
last
otherwise.
Example
#include <algorithm> #include <functional> #include <iomanip> #include <iostream> #include <string_view> int main() { constexpr std::string_view in = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed " "do eiusmod tempor incididunt ut labore et dolore magna aliqua"; const std::string_view needle{"pisci"}; auto it = std::search(in.begin(), in.end(), std::default_searcher( needle.begin(), needle.end())); if (it != in.end()) std::cout << "The string " << std::quoted(needle) << " found at offset " << it - in.begin() << '\n'; else std::cout << "The string " << std::quoted(needle) << " not found\n"; }
Output:
The string "pisci" found at offset 43
See also
searches for the first occurrence of a range of elements
(function template) |
|
(C++17)
|
Boyer-Moore search algorithm implementation
(class template) |
(C++17)
|
Boyer-Moore-Horspool search algorithm implementation
(class template) |