std::bad_any_cast
Defined in header <any>
|
||
|
class bad_any_cast :
public
std::bad_cast
;
|
(since C++17) | |
Defines a type of object to be thrown by the value-returning forms of std::any_cast on failure.
Member functions
(constructor) |
constructs a new bad_any_cast object (public member function) |
operator= |
replaces the bad_any_cast object (public member function) |
what |
returns the explanatory string (public member function) |
std::bad_any_cast::bad_any_cast
bad_any_cast() noexcept; |
(1) | (since C++17) |
|
bad_any_cast(
const bad_any_cast& other )
noexcept
;
|
(2) | (since C++17) |
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
| other | - | another exception object to copy |
std::bad_any_cast::operator=
|
bad_any_cast& operator=
(
const bad_any_cast& other )
noexcept
;
|
(since C++17) | |
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
Parameters
| other | - | another exception object to assign with |
Return value
*this
std::bad_any_cast::what
|
virtual
const
char
* what(
)
const
noexcept
;
|
(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 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::bad_cast
Inherited from std::exception
Member functions
|
[virtual]
|
destroys the exception object (virtual public member function of std::exception) |
|
[virtual]
|
returns an explanatory string (virtual public member function of std::exception) |
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