std::optional::operatorbool,std::optional::has_value (3) Linux Manual Page

std::optional<T>::operatorbool,std::optional<T>::has_value – std::optional<T>::operatorbool,std::optional<T>::has_value

Synopsis

constexpr explicit operator bool() const noexcept; (since C++17)
constexpr bool has_value() const noexcept; (since C++17)
Checks whether *this contains a value.

Parameters

(none)

Return value

true if *this contains a value, false if *this does not contain a value.