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.
default_searcher( ForwardIt pat_first,
ForwardIt pat_last,
BinaryPredicate pred = BinaryPredicate());
|
Constructs a default_searcher by storing copies of pat_first, pat_last, and pred.
| pat_first, pat_last | - | a pair of iterators designating the string to be searched for |
| pred | - | a callable object used to determine equality |
Any exceptions thrown by the copy constructors of BinaryPredicate or ForwardIt.
template< class ForwardIt2 >
std::pair<ForwardIt2, ForwardIt2>
operator()( ForwardIt2 first, ForwardIt2 last ) const;
|
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.
| first, last | - | a pair of iterators designating the string to be examined |
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.
#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
| searches for a range of elements (function template) |
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