ptr_fun ptr_fun Categories: functors, adaptors Component type: function Prototype template <class Arg, class Result> pointer_to_unary_function<Arg, Result> ptr_fun(Result (*x)(Arg)); template <class Arg1, class Arg2, class Result> pointer_to_binary_function<Arg1, Arg2, Result> ptr_fun(Result (*x)(Arg1, Arg2)); Description Ptr_fun takes a function pointer as its argument and returns a function pointer adaptor, a type of function object. It is actually two different functions, not one (that is, the name ptr_fun is overloaded). If its argument is of type Result (*)(Arg) then ptr_fun creates a pointer_to_unary_function, and if its argument is of type Result (*)(Arg1, Arg2) then ptr_fun creates a pointer_to_binary_function. Definition Defined in the standard header functional, and in the nonstandard backward-compatibility header function.h. Requirements on types The argument must be a pointer to a function that takes either one or two arguments. The argument type(s) and the return type of the function are arbitrary, with the restriction that the function must return a value; it may not be a void function. Preconditions Complexity Example See the examples in the discussions of pointer_to_unary_function and pointer_to_binary_function. Notes See also Function Objects, pointer_to_unary_function, pointer_to_binary_function, Adaptable Unary Function, Adaptable Binary Function Copyright © 1999 Silicon Graphics, Inc. All Rights Reserved. TrademarkInformation