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function pointer
A function pointer (or subroutine pointer or procedure pointer) is a type of pointer supported by third-generation programming languages (such as PL/I, COBOL, Fortran, dBASE dBL, and C) and object-oriented programming languages (such as C++ and D).
Instead of referring to data values, a function pointer points to executable code within memory. When dereferenced, a function pointer can be used to invoke the function it points to and pass it arguments just like a normal function call. Such an invocation is also known as an "indirect" call, because the function is being invoked ''indirectly'' through a variable instead of ''directly'' through a fixed name or address.
Function pointers can be used to simplify code by providing a simple way to select a function to execute based on run-time values.
==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 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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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