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c++typedef
metdos
metdos

Reputation: 13929

Typedef C++, couldn't resolve its meaning

I read this typedef line in a C++ book, but I couldn't resolve its meaning:

typedef Shape* (*CreateShapeCallBack)();

Now, CreateShapeCallBack stands for what, any idea? Thanks.

Upvotes: 2

Views: 202

Answers (4)

knittl
knittl

Reputation: 265151

returntype (*functionpointer)(parameters, ...)

is a function pointer in c++

Upvotes: 1

M. Williams
M. Williams

Reputation: 4985

Pointer to a function returning a pointer to a Shape instance (which is Shape*) and taking void as a param - no params.

Compare this with, for example typedef int (*function_pointer)(double); - this is a pointer to a function that takes double as a parameter and returns int...

Upvotes: 2

VDVLeon
VDVLeon

Reputation: 1394

It defines CreateCallBack as a function pointer. The function haves no arguments and returns the Shape pointer.

Upvotes: 1

anon
anon

Reputation:

It's the type of a pointer to a function that returns a pointer to a Shape and takes no parameters. You could use it like this:

Shape * Func() {
   // do stuff - return Shape pointer
}

...
CreateShapeCallBack p = Func;

Upvotes: 8

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