Interested to Buy Any Domain ? << Click Here >> for more details...
How many types of casting are there in C++?
When is a dynamic cast,static_cast,reinterpret cast used?
- 2 Answers
- 9224 Views
- CTS, I also Faced
- E-Mail Answers
Answer Posted / shakti singh khinchi
There are 4 types of castings in C++ which is known as RTTI
(Run Time Type Identification).
Dynamic cast: When dynamic_cast cannot cast a pointer
because it is not a complete object of the required class
-as in the second conversion in the previous example- it
returns a null pointer to indicate the failure. If
dynamic_cast is used to convert to a reference type and the
conversion is not possible, an exception of type bad_cast is
thrown instead.
dynamic_cast can also cast null pointers even between
pointers to unrelated classes, and can also cast pointers of
any type to void pointers (void*).
static cast:static_cast can perform conversions between
pointers to related classes, not only from the derived class
to its base, but also from a base class to its derived. This
ensures that at least the classes are compatible if the
proper object is converted, but no safety check is performed
during runtime to check if the object being converted is in
fact a full object of the destination type.
const cast:This type of casting manipulates the constness of
an object, either to be set or to be removed
reinterpret cast;reinterpret_cast converts any pointer type
to any other pointer type, even of unrelated classes. The
operation result is a simple binary copy of the value from
one pointer to the other. All pointer conversions are
allowed: neither the content pointed nor the pointer type
itself is checked.
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
Explain the static storage classes in c++.
Does there exist any other function which can be used to convert an integer or a float to a string?
What is the default width for ouputting a long integer using the insertion operator?
What's the order in which the objects in an array are destructed?
State the difference between delete and delete[].
Explain virtual class?
What is the insertion operator and what does it do?
What is time_t c++?
What do you mean by overhead in c++?
Why is main function important?
What is a driver program?
What is c++ used for in games?
What is malloc in c++?
What is abstraction c++?
What happens when the extern "c" char func (char*,waste) executes?
