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# std::bad_optional_access

From cppreference.com
< cpp‎ | utility

Defined in header `<optional>` |  |
class bad_optional_access; |  | (library fundamentals TS)

Defines a type of object to be thrown as exception when accessing a std::experimental::optional object with uninitialized state.

Inheritance diagram

### [edit] Member functions

(constructor) | constructs the exception object (public member function) [edit]

# std::bad_optional_access::bad_optional_access

explicit bad_optional_access( const std::string& what_arg ); | (1) | (library fundamentals TS)
explicit bad_optional_access( const char* what_arg ); | (2) | (library fundamentals TS)

Constructs the exception object with `what_arg` as explanatory string that can be accessed through `what()`.

### Parameters

what_arg | - | explanatory string

### Exceptions

(none)

## Inherited from std::exception

### Member functions

(destructor) [virtual] | destructs the exception object (virtual public member function of `std::exception`) [edit]
what [virtual] | returns an explanatory string (virtual public member function of `std::exception`) [edit]

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