An exception of this type is thrown when a dynamic_cast to a reference type fails the run-time check (e.g., because the types are not related by inheritance), and also from std::use_facet if the requested facet does not exist in the locale.
Inheritance diagram
[edit] Member functions constructs a newbad_cast object
bad_cast object
bad_cast() throw();
(until C++11)bad_cast() noexcept;
(since C++11)bad_cast( const bad_cast& other ) throw();
(until C++11)bad_cast( const bad_cast& other ) noexcept;
(since C++11)Constructs a new bad_cast 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 typestd::bad_cast then std::strcmp(what(), other.what()) == 0.(since C++11) Parameters other - another exception object to copy std::bad_cast::operator=
bad_cast& operator=( const bad_cast& other ) throw();
(until C++11)bad_cast& operator=( const bad_cast& other ) noexcept;
(since C++11)Assigns the contents with those of other. If *this and other both have dynamic type std::bad_cast then std::strcmp(what(), other.what()) == 0 after assignment.(since C++11)
*this
std::bad_cast::whatvirtual const char* what() const throw();
(until C++11)virtual const char* what() const noexcept;
(since C++11)Returns the explanatory string.
Return valuePointer 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.
The returned string is encoded with the ordinary literal encoding during constant evaluation.
(since C++26) NotesImplementations are allowed but not required to override what().
std::exception) [edit] returns an explanatory string
std::exception) [edit] [edit] Notes [edit] Example
#include <iostream>
#include <typeinfo>
struct Foo { virtual ~Foo() {} };
struct Bar { virtual ~Bar() { std::cout << "~Bar\n"; } };
struct Pub : Bar { ~Pub() override { std::cout << "~Pub\n"; } };
int main()
{
Pub pub;
try
{
[[maybe_unused]]
Bar& r1 = dynamic_cast<Bar&>(pub); // OK, upcast
[[maybe_unused]]
Foo& r2 = dynamic_cast<Foo&>(pub); // throws
}
catch (const std::bad_cast& e)
{
std::cout << "e.what(): " << e.what() << '\n';
}
}
Possible output:
e.what(): std::bad_cast ~Pub ~Bar
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