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Description

Pointer_to_unary_function is a function object adaptor that allows a function pointer Result (*f)(Arg) to be treated as an Adaptable Unary Function. That is: if F is a pointer_to_unary_function that was initialized with an underlying function pointer f of type Result (*)(Arg), then F(x) calls the function f(x). The difference between f and F is that pointer_to_unary_function is an Adaptable Unary Function, i.e. it defines the nested typedef s argument_type and result_type.

Note that a function pointer of type Result (*)(Arg) is a perfectly good Unary Function object, and may be passed to an STL algorithm that expects an argument that is a Unary Function. The only reason for using the pointer_to_unary_function object is if you need to use an ordinary function in a context that requires an Adaptable Unary Function, e.g. as the argument of a function object adaptor.

Most of the time, you need not declare an object of type pointer_to_unary_function directly. It is almost always easier to construct one using the ptr_fun function.


pointer_to_unary_function < Arg, Result > | Standard Template Library Programmer`s Guide | Example







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