std::bad_expected_access - cppreference.com
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| Defined in header |
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(1) | (since C++23) |
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(2) | (since C++23) |
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_access<E> stores a copy of the unexpected value.
2) bad_expected_access<void> is the base class of all other bad_expected_access specializations.
Members of the primary template
constructs a bad_expected_access object (public member function) | |
| returns the stored value (public member function) | |
| returns the explanatory string (public member function) |
std::bad_expected_access::bad_expected_access
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Constructs a new bad_expected_access<E> object. Initializes the stored value with std::move(e).
std::bad_expected_access::error
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Returns a reference to the stored value.
std::bad_expected_access::what
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Returns the explanatory string.
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
constructs a bad_expected_access<void> object (protected member function) | |
destroys the bad_expected_access<void> object (protected member function) | |
replaces the bad_expected_access<void> object (protected member function) | |
| 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.