Turning a function into a proc object

Ruby
1

Consider the following piece of code:

f = Proc.new {|*args| g(*args)}

f is a proc object which, when called, basically behaves like g (the
only difference being the fact that one additional function call is
executed, when g is called “via f”.

Now two questions about it:

  • Is there a (syntactically) easier way to write this? I first thought
    that
    f = &:g
    would be valid, but it isn’t.

  • Is there a way in Ruby to define a “function pointer” f (using C
    terminology here), so that calling f(…) is absolutely equivalent to
    calling g(…)? I do NOT mean creating an alias to the function.

2

f = method(:g).to_proc
f.class
=> Proc

I am not certain what exactly you need, but try this for “function
pointers”.

Either this

h = method(:g)
g(“parameter”)
h[“parameter”]

or this

define_method(:h,method(:g))
g(“parameter”)
h(“parameter”)

3

This is exactly what I was looking for. Thanks a lot.