std::default_searcher
<functional>
class default_searcher;
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.
Contents
[edit] Member functions
std::default_searcher::default_searcher
ForwardIt pat_last,
(constexpr since C++20)
Constructs a std::default_searcher by storing copies of pat_first, pat_last, and pred.
Parameters
Exceptions
Any exceptions thrown by the copy constructors of BinaryPredicate or ForwardIt.
std::default_searcher::operator()
std::pair <ForwardIt2, ForwardIt2>
(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
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.
[edit] 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