std::experimental::default_searcher, std::experimental::make_default_searcher

 

C++

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Technical specifications

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Experimental

Technical Specification

Filesystem library(filesystem TS)

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Library fundamentals 3(library fundamentals TS v3)

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experimental::optional

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experimental::invocation_typeexperimental::raw_invocation_type

experimental::search

experimental::default_searcherexperimental::make_default_searcher

experimental::boyer_moore_searcherexperimental::make_boyer_moore_searcher

experimental::boyer_moore_horspool_searcherexperimental::make_boyer_moore_horspool_searcher

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Defined in header <experimental/functional>
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.

Member functions

std::experimental::default_searcher::default_searcher

default_searcher( ForwardIterator pat_first,                   ForwardIterator pat_last,                   BinaryPredicate pred = BinaryPredicate());

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>     operator()( ForwardIterator2 first, ForwardIterator2 last )const;		(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 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.	(until C++17)

Parameters

first, last

-

a pair of iterators designating the string to be examined

Return value

Iterator to the first position in [first, last) where a subsequence that compares equal to [pat_first, pat_last) as defined by pred is located, or a copy of last otherwise.	(until C++17)
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.	(since C++17)

Helper Functions

template<class ForwardIterator, class BinaryPredicate =std::equal_to<>> default_searcher<ForwardIterator, BinaryPredicate> make_default_searcher(     ForwardIterator pat_first,     ForwardIterator pat_last,     BinaryPredicate pred = BinaryPredicate());		(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);

Parameters

pat_first, pat_last	-	a pair of iterators designating the string to be searched for
pred	-	a callable object used to determine equality

Return value

A default_searcher constructed with the arguments pat_first, pat_last, pred.

Example

Run this code

#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';elsestd::cout<<"The string "<< needle <<" not found\n";}

Output:

The string pisci found at offset 43

See also

search

searches for the first occurrence of a range of elements (function template)