std::bad_optional_access(3) C++ Standard Libary std::bad_optional_access(3) NAME std::bad_optional_access - std::bad_optional_access Synopsis Defined in header <optional> class bad_optional_access; (since C++17) Defines a type of object to be thrown by std::optional::value when ac- cessing an optional object that does not contain a value. std-bad optional access-inheritance-lwg2806.svg Inheritance diagram Member functions constructor constructs a new bad_optional_access object (public member function) operator= replaces the bad_optional_access object (public member function) what returns the explanatory string (public member function) std::bad_optional_access::bad_optional_access bad_optional_access() noexcept; (1) (since C++17) bad_optional_access( const bad_optional_access& other ) noexcept; (2) (since C++17) Constructs a new bad_optional_access object with an implementation-de- fined 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= bad_optional_access& operator=( const bad_optional_access& other ) (since C++17) noexcept; 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 af- ter assignment. Parameters other - another exception object to assign with Return value *this std::bad_optional_access::what virtual const char* what() const noexcept; (since C++17) 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(). Inherited from std::exception Member functions destructor destroys the exception object [virtual] (virtual public member function of std::exception) what returns an explanatory string [virtual] (virtual public member function of std::exception) http://cppreference.com 2024.06.10 std::bad_optional_access(3)
NAME | Synopsis | Member functions | Parameters | Parameters | Return value | Parameters | Return value | Notes | Member functions
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