Function Object
A function object class that adapts a pointer to a function, to take the place of a unary_function.
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#include <functional> template <class Arg, class Result> class pointer_to_unary_function : public unary_function<Arg, Result>;
The pointer_to_unary_function class encapsulates a pointer to a single-argument function. The class uses operator() so that the resulting object serves as a function object for that function.
The ptr_fun function is overloaded to create instances of pointer_to_unary_function when included with the appropriate pointer to a function.
template <class Arg, class Result> class pointer_to_unary_function : public unary_function<Arg, Result> { public: explicit pointer_to_unary_function (Result (*f)(Arg)); Result operator() (const Arg&) const; }; template<class Arg, class Result> pointer_to_unary_function<Arg, Result> ptr_fun (Result (*f)(Arg));
Function Objects, pointer_to_binary_function, ptr_fun, unary_function