From: Martin Weber <Ephaeton@...>
Date: 2003-01-08T23:30:51+09:00
Subject: Re: Can you detect if a method takes a block argument?

Quick shot, suppose ruby wizards can make this still better.

def use_block?(invoke)
	catch (:block) do
		eval "#{invoke} do
			throw :block, true
		end"
	end or false
end

pass the call you want to check along with arguments as string.

> use_block?("print('3\n')")
3
=> false
> use_block?("[1,2,3].sort")
=> true

-Martin