static_cast
In C++ type conversion, the static_cast operator does an explicit type conversion.[1]
Syntax
static_cast<type> (object);
The type parameter must be a data type for which there is a known method for converting object to, whether this be a builtin or through a casting function. It can be a reference or an enumerator. All types of conversions that are well-defined and allowed by the compiler are done using static_cast.[2]
The static_cast operator can be used for operations such as
- Converting a pointer of a base class to a pointer of a derived class,
- Convert numeric data types such as enums to ints or ints to floats.
However, static_cast conversions are not necessarily safe as no run-time type check is done which can cause casting between incompatible data types, for example pointers. However, this is checked at compile time to prevent casting obvious incompatibles. Also, static_cast between pointer of a virtual base to pointer of derived is not allowed, because of the object layout model.
See also
References
- ^ Programming: Principles and Practice Using C++. United States of America: Addison-Wesley. 2008. p. 594. ISBN 0321543726.
- ^ Thinking in C++. United States of America: Alan Apt. 2000. p. 857. ISBN 0-13-979809-9.