Node:Adaptors for pointers to functions, Previous:Binders, Up:Function adaptors

Adaptors for pointers to functions

pointer_to_unary_function	Unary Function Object
pointer_to_binary_function	Binary Function Object

pointer_to_unary_function<Arg, Result> ptr_fun (Result (*x)(Arg))	Function
pointer_to_binary_function<Arg1, Arg2, Result> ptr_fun (Result (*x)(Arg1, Arg2))	Function

To allow pointers to (unary and binary) functions to work with function adaptors the library provides:

template 
class pointer_to_unary_function : public unary_function {
protected:
    Result (*ptr)(Arg);

public:
    pointer_to_unary_function() {}
    pointer_to_unary_function(Result (*x)(Arg)) : ptr(x) {}
    Result operator()(Arg x) const { return ptr(x); }
};

template 
pointer_to_unary_function ptr_fun(Result (*x)(Arg)) {
    return pointer_to_unary_function(x);
}

template 
class pointer_to_binary_function
: public binary_function {
protected:
    Result (*ptr)(Arg1, Arg2);

public:
    pointer_to_binary_function() {}
    pointer_to_binary_function(Result (*x)(Arg1, Arg2)) : ptr(x) {}
    Result operator()(Arg1 x, Arg2 y) const { return ptr(x, y); }
};

template 
pointer_to_binary_function
    ptr_fun(Result (*x)(Arg1, Arg2)) {
        return pointer_to_binary_function(x);
}