W3cubDocs

/C++

deduction guides for std::basic_regex

Defined in header <regex> 
template<class ForwardIt> 
basic_regex(ForwardIt, ForwardIt,
            std::regex_constants::syntax_option_type = std::regex_constants::ECMAScript)
-> basic_regex<typename std::iterator_traits<ForwardIt>::value_type>;
 (since C++17)

This deduction guide is provided for std::basic_regex to allow deduction from an iterator range.

Example

#include <regex>
#include <vector>
int main() {
   std::vector<char> v = {'a', 'b', 'c'};
   std::basic_regex re(v.begin(), v.end()); // uses explicit deduction guide
}

© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/w/cpp/regex/basic_regex/deduction_guides