std::bad_optional_access - cppreference.com
From cppreference.com
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(since C++17) | |
Defines a type of object to be thrown by std::optional::value when accessing an optional object that does not contain a value.
Inheritance diagram
Member functions
constructs a new bad_optional_access object (public member function) | |
replaces the bad_optional_access object (public member function) | |
| returns the explanatory string (public member function) |
std::bad_optional_access::bad_optional_access
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(1) | (since C++17) |
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(2) | (since C++17) |
Constructs a new bad_optional_access object with an implementation-defined null-terminated byte string which is accessible through what().
1) Default constructor.
2) Copy constructor. If *this and other both have dynamic type std::bad_optional_access then std::strcmp(what(), other.what()) == 0.
Parameters
| other | - | another exception object to copy |
std::bad_optional_access::operator=
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(since C++17) | |
Assigns the contents with those of other.If *this and other both have dynamic type std::bad_optional_access then std::strcmp(what(), other.what()) == 0 after assignment.
Parameters
| other | - | another exception object to assign with |
Return value
*this
std::bad_optional_access::what
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(since C++17) | |
Returns the explanatory string.
Return value
Pointer to an implementation-defined 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.
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The returned string is encoded with the ordinary literal encoding during constant evaluation. |
(since C++26) |
Notes
Implementations are allowed but not required to override what().
Inherited from std::exception
Member functions
| destroys the exception object (virtual public member function of std::exception) [edit]
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| returns an explanatory string (virtual public member function of std::exception) [edit]
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