std::default_searcher
Defined in header <functional>
|
||
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.
default_searcher
is CopyConstructible and CopyAssignable.
Member functions
std::default_searcher::default_searcher
default_searcher( ForwardIt pat_first, ForwardIt pat_last, |
(since C++17) (until C++20) |
|
constexpr default_searcher( ForwardIt pat_first, ForwardIt pat_last, |
(since C++20) | |
Constructs a 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) (until C++20) |
|
template< class ForwardIt2 > constexpr std::pair<ForwardIt2, ForwardIt2> |
(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 <iostream> #include <string> #include <algorithm> #include <functional> int main() { std::string in = "Lorem ipsum dolor sit amet, consectetur adipiscing elit," " sed do eiusmod tempor incididunt ut labore et dolore magna aliqua"; std::string 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 " << needle << " found at offset " << it - in.begin() << '\n'; else std::cout << "The string " << needle << " not found\n"; }
Output:
The string pisci found at offset 43
See also
searches for a range of elements (function template) |