std::any::has_value (3) - Linux Manuals
std::any::has_value: std::any::has_value
NAME
std::any::has_value - std::any::has_value
Synopsis
bool has_value() const noexcept; (since C++17)
Checks whether the object contains a value.
Parameters
(none)
Return value
true if instance contains a value, otherwise false.