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std::bad_expected_access(3)    C++ Standard Libary   std::bad_expected_access(3)

NAME
     std::bad_expected_access - std::bad_expected_access

Synopsis
	Defined in header <expected>
	template<  class  E  >						     (1)
     (since C++23)
	class bad_expected_access : public std::bad_expected_access<void>
	template<>							     (2)
     (since C++23)
	class bad_expected_access<void> : public std::exception

	1)  Defines  a	type of object to be thrown by std::expected::value when
     accessing an
	expected object that  contains	an  unexpected	value.	bad_expected_ac-
     cess<E> stores a
	copy of the unexpected value.
	2)  bad_expected_access<void>  is  the	base  class of all other bad_ex-
     pected_access
	specializations.

	 This section is incomplete
	 Reason: inheritance diagram

Parameters
	(none)

Return value
	Pointer to a null-terminated string with  explanatory  information.  The
     string is
	suitable  for  conversion  and display as a std::wstring. The pointer is
     guaranteed to
	be valid at least until the exception object from which it  is	obtained
     is destroyed,
	or  until a non-const member function (e.g. copy assignment operator) on
     the
	exception object is called.

Notes
	Implementations are allowed but not required to override what().

	Members of the bad_expected_access<void> specialization

	constructor   constructs a bad_expected_access<void> object
		      (protected member function)
	destructor    destroys the bad_expected_access<void> object
		      (protected member function)
	operator=     replaces the bad_expected_access<void> object
		      (protected member function)
	what	      returns the explanatory string
		      (public member function)

	Special member functions  of  bad_expected_access<void>  are  protected.
     They can only
	be called by derived classes.

Example
	 This section is incomplete
	 Reason: no example

Categories:
	  * Todo with reason
	  * Todo no example

http://cppreference.com 	   2024.06.10	     std::bad_expected_access(3)
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