bool empty() const; | (since C++11) (until C++20) | |
[[nodiscard]] bool empty() const; | (since C++20) |
Checks whether the match was successful.
(none).
true if *this represents the result of a failed match, false otherwise, i.e. size() == 0.
May throw implementation-defined exceptions.
Constant.
| returns the number of matches in a fully-established result state (public member function) |
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