Typical errors include:. One way to avoid these bugs is to call Release through a function that safely releases the pointer. The following code shows a function that does this:.
The SafeRelease function checks for this and skips the call to Release. It is also safe to call SafeRelease more than once on the same pointer, as shown here:. It would be nice to have a class that wraps the underlying interface pointer and automatically initializes and releases the pointer.
In other words, we want something like this:. The class definition shown here is incomplete, and is not usable as shown. At a minimum, you would need to define a copy constructor, an assignment operator, and a way to access the underlying COM pointer. The main difference between this code and the original example is that this version does not explicitly call Release. On failure, returns the null pointer. Casting is a conversion process wherein data is changed from one type to another.
Implicit Conversion is an automatic process done by the compiler; on the other hand, Explicit Conversion needs the user-involvement. Moreover, a cast is a way of explicitly letting the compiler know that you want to intend the Conversion, and it can also further cause data loss. Using Type Casting operators instead of C-style Conversion embraces the readability of the program.
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