A function pointer (or subroutine pointer) is a type of pointer supported by third-generation programming languages (such as PL/I, COBOL, Fortran 2003, 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.
Read more about Function Pointer: Simple Function Pointers, Functors, Method Pointers, In C++
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