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Defines the type of objects thrown as exceptions to report the situation where an attempt is made to access the value of an optional object that doesn't contain a value.
Syntax
class bad_optional_access : public exception
{
public:
bad_optional_access() noexcept;
bad_optional_access(const bad_optional_access&) noexcept;
bad_optional_access& operator=(const bad_optional_access&) noexcept;
const char* what() const noexcept override;
};