std::bad_expected_access
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Defined in header
<expected> |
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template< class E >
class bad_expected_access : public std::bad_expected_access<void> |
(1) | (since C++23) |
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template<>
class bad_expected_access<void> : public std::exception |
(2) | (since C++23) |
bad_expected_access<E> stores a copy of the unexpected value.bad_expected_access<void> is the base class of all other bad_expected_access specializations.| This section is incomplete Reason: inheritance diagram |
Members of the primary template
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(constructor)
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constructs a bad_expected_access object(public member function) |
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error
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returns the stored value (public member function) |
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what
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returns the explanatory string (public member function) |
std::bad_expected_access::bad_expected_access
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explicit bad_expected_access( E e );
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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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const E& error() const & noexcept;
E& error() & noexcept; |
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Returns a reference to the stored value.
std::bad_expected_access::what
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const char* what() const noexcept override;
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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
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(constructor)
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constructs a bad_expected_access<void> object(protected member function) |
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(destructor)
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destroys the bad_expected_access<void> object(protected member function) |
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operator=
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replaces the bad_expected_access<void> object(protected member function) |
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what
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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 |