NAME

std::match_results::empty - std::match_results::empty

Synopsis

bool empty() const; (since C++11)
(until C++20)
[[nodiscard]] bool empty() const; (since C++20)

Checks whether the match was successful.

Parameters

(none)

Return value

true if *this represents the result of a failed match, false otherwise, i.e. size()
== 0.

Exceptions

May throw implementation-defined exceptions.

Complexity

Constant.

See also

size returns the number of matches in a fully-established result state
(public member function)