Simple Function Pointers
The simplest implementation of a function (or subroutine) pointer is as a variable containing the address of the function within executable memory. Older third-generation languages such as PL/I and COBOL, as well as more modern languages such as Pascal and C generally implement function pointers in this manner. Such pointers in older languages are generally less type-safe than in more modern languages, though, since the latter associate more typing information with a function pointer variable, such as the data type of the return value of the function and the data type information of the parameters to the function.
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