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std::bad_optional_access

STD：不好[医]任选[医]存取

Defined in header ​​
class bad_optional_access;​(since C++17)

定义要由std::optional::value当访问不包含值的可选对象时。

二次

二次

继承图

成员函数

(constructor)constructs the exception object (public member function)

继承自STD：例外

成员函数

(destructor) virtualdestructs the exception object (virtual public member function of std::exception)
what virtualreturns an explanatory string (virtual public member function of std::exception)

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