std::experimental::default_searcher, std::experimental::make_default_searcher
Defined in header <experimental/functional>
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template< class ForwardIterator1, class BinaryPredicate = std::equal_to<> > class default_searcher; |
(library fundamentals TS) | |
A class suitable for use with std::experimental::search that delegates the search operation to the standard library's std::search.
default_searcher
is CopyConstructible and CopyAssignable.
Contents |
[edit] Member functions
std::experimental::default_searcher::default_searcher
default_searcher( ForwardIterator pat_first, ForwardIterator pat_last, |
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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 ForwardIterator
.
std::experimental::default_searcher::operator()
template< class ForwardIterator2 > ForwardIterator2 operator()( ForwardIterator2 first, ForwardIterator2 last ) const; |
(until C++17) | |
template< class ForwardIterator2 > std::pair<ForwardIterator2, ForwardIterator2> |
(since C++17) | |
The member function called by std::experimental::search to perform a search with this searcher.
Equivalent to std::search(first, last, pat_first, pat_last, pred);. |
(until C++17) |
Returns a pair of iterators |
(until C++17) |
Parameters
first, last | - | a pair of iterators designating the string to be examined |
Return value
Iterator to the first position in |
(until C++17) |
A pair of iterators to the first and one past last positions in |
(since C++17) |
[edit] Helper Functions
template< class ForwardIterator, class BinaryPredicate = std::equal_to<> > default_searcher<ForwardIterator, BinaryPredicate> make_default_searcher( |
(library fundamentals TS) | |
Helper function that constructs a std::experimental::default_searcher
using template argument deduction. Equivalent to return default_searcher<ForwardIterator, BinaryPredicate>(pat_first, pat_last, pred);
[edit] Parameters
pat_first, pat_last | - | a pair of iterators designating the string to be searched for |
pred | - | a callable object used to determine equality |
[edit] Return value
A default_searcher
constructed with the arguments pat_first, pat_last, pred.
[edit] Example
#include <experimental/algorithm> #include <experimental/functional> #include <iostream> #include <string> 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::experimental::search(in.begin(), in.end(), std::experimental::make_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
[edit] See also
searches for the first occurrence of a range of elements (function template) |