std::error_code::operatorbool (3) - Linux Manuals
std::error_code::operatorbool: std::error_code::operatorbool
NAME
std::error_code::operatorbool - std::error_code::operatorbool
Synopsis
explicit operator bool() const noexcept; (since C++11)
Checks if the error value is valid, i.e. non-zero.
Parameters
(none)
Return value
false if value() == 0, true otherwise.