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Is it safe to assign null to an opaque pointer?
Opaque pointer is a pointer which points to a data structure whose contents are not exposed at the time of its definition. Following pointer is opaque. One can’t know the data contained in STest structure by looking at the definition. struct STest* pSTest; It is safe to assign NULL to an opaque pointer.
Which is the best definition of opaque pointer?
Opaque pointer is a pointer which points to a data structure whose contents are not exposed at the time of its definition. Following pointer is opaque. One can’t know the data contained in STest structure by looking at the definition.
Are there any ways to declare opaque types in C?
I’ve seen both of the following two styles of declaring opaque types in C APIs. What are the various ways to declare opaque structs/pointers in C? Is there any clear advantage to using one style over the other?
Why do we use opaque structs in GitHub?
It hides the extremely important piece of information that variables of this type reference an object which could be modified whenever you pass them to functions, and it makes dealing with differently-qualified (for instance, const -qualified) versions of the pointer a major pain. R.. GitHub STOP HELPING ICE R.. GitHub STOP HELPING ICE
What’s the difference between opaque pointer and opaque pointer?
Opaque as the name suggests is something we can’t see through. e.g. wood is opaque. Opaque pointer is a pointer which points to a data structure whose contents are not exposed at the time of its definition.
Is it an advantage to return a pointer to a structure?
One of the reasons I thought that is would be an advantage to return a pointer to a structure is to be able to tell more easily if the function failed by returning NULL pointer. Returning a full structure that is NULL would be harder I suppose or less efficient. Is this a valid reason?
Which is better copying a structure or a pointer?
First, copying a structure takes a lot more CPU time than copying a pointer. If this is something your code does frequently, it can cause a noticeable performance difference. Second, no matter how many times you copy a pointer around, it’s still pointing to the same structure in memory.