std::experimental::search

 

C++

Language

Standard Library Headers

Freestanding and hosted implementations

Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

Technical Specifications

 

Technical specifications

Filesystem library (filesystem TS)

Library fundamentals (library fundamentals TS)

Library fundamentals 2 (library fundamentals 2 TS)

Extensions for parallelism (parallelism TS)

Extensions for parallelism 2 (parallelism TS v2)

Extensions for concurrency (concurrency TS)

Concepts (concepts TS)

Ranges (ranges TS)

Special mathematical functions (special math TR)

 

Library fundamentals

experimental::optional

experimental::any

experimental::basic_string_view

experimental::sample

experimental::shared_ptr

experimental::weak_ptr

experimental::apply

experimental::invocation_type experimental::raw_invocation_type

experimental::search

experimental::default_searcher experimental::make_default_searcher

experimental::boyer_moore_searcher experimental::make_boyer_moore_searcher

experimental::boyer_moore_horspool_searcher experimental::make_boyer_moore_horspool_searcher

type-erased and polymorphic allocators

variable templates for type traits

 

Defined in header <experimental/algorithm>
template<class ForwardIterator, class Searcher> ForwardIterator search( ForwardIterator first, ForwardIterator last,                         const Searcher& searcher );		(library fundamentals TS)

Searches the sequence [first, last) for the pattern specified in the constructor of searcher.

Effectively executes searcher(first, last).	(until C++17)
Effectively executes searcher(first, last).first.	(since C++17)

Searcher need not be CopyConstructible.

The standard library provides the following searchers:

default_searcher	standard C++ library search algorithm implementation (class template)
boyer_moore_searcher	Boyer-Moore search algorithm implementation (class template)
boyer_moore_horspool_searcher	Boyer-Moore-Horspool search algorithm implementation (class template)

Return value

Returns the result of searcher.operator(), that is, an iterator to the location at which the substring is found or a copy of last if it was not found.

Complexity

Depends on the searcher

Example

Run this code

#include <iostream>
#include <string>
#include <experimental/algorithm>
#include <experimental/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::experimental::search(in.begin(), in.end(),
                   std::experimental::make_boyer_moore_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

search

searches for a range of elements (function template)