std:: bad_expected_access
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Defined in header
<expected>
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||
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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.
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This section is incomplete
Reason: inheritance diagram |
Members of the primary template
|
(constructor)
|
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
|
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
|
const
E
&
error
(
)
const
&
noexcept
;
E
&
error
(
)
&
noexcept
;
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||
Returns a reference to the stored value.
std::bad_expected_access:: what
|
const
char
*
what
(
)
const
noexcept
override
;
|
||
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
|
(constructor)
|
constructs a
bad_expected_access<void>
object
(protected member function) |
|
(destructor)
|
destroys the
bad_expected_access<void>
object
(protected member function) |
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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 |