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Function, Previous: Function Call Semantics, Up: Functions [Contents][Index]
A function name refers to a fixed function. Sometimes it is useful to call a function to be determined at run time; to do this, you can use a function pointer value that points to the chosen function (see Pointers).
Pointer-to-function types can be used to declare variables and other
data, including array elements, structure fields, and union
alternatives. They can also be used for function arguments and return
values. These types have the peculiarity that they are never
converted automatically to void *
or vice versa. However, you
can do that conversion with a cast.