std::bad_any_cast
<any>
Defines a type of object to be thrown by the value-returning forms of std::any_cast on failure.
Contents
[edit] Member functions
bad_any_cast object (public member function)
bad_any_cast object (public member function)
(public member function)
std::bad_any_cast::bad_any_cast
Constructs a new bad_any_cast object with an implementation-defined null-terminated byte string which is accessible through what().
std::bad_any_cast then std::strcmp (what(), other.what()) == 0.Parameters
std::bad_any_cast::operator=
Assigns the contents with those of other. If *this and other both have dynamic type std::bad_any_cast then std::strcmp (what(), other.what()) == 0 after assignment.
Parameters
Return value
*this
std::bad_any_cast::what
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.
Notes
Implementations are allowed but not required to override what().
Inherited from std::bad_cast
Inherited from std::exception
Member functions
[edit] Example
#include <any> #include <cassert> #include <print> int main() { auto x = std::any (42); assert (std::any_cast <int>(x) == 42); // OK try { [[maybe_unused]] auto s = std::any_cast <std::string >(x); // throws } catch (const std::bad_any_cast& ex) { std::println ("{}", ex.what()); } }
Possible output:
bad any_cast