stuff

ruby.rb

class Fixnum 
  def upto2(n)
    (self..n).to_a.map{|k| yield k }
  end
end

class A
  def sum(n)
    sum = 0
    1.upto(n) do |i|
      sum += sql(n)
      sum += sql(n-1)
    end
  end
  def sql(n)
    Kernel.rand(n)
  end
end

class B; def he; p 'hello'; end; end
require 'singleton'
class Benchmark
  include Singleton

  def for(klass, method = klass.instance_methods(false))
    overriden_methods = (Array(method) + ['initialize']).map do |m|
      <<-EOR
      unless method_defined?(:_benchmark_#{m})
        alias_method :_benchmark_#{m}, :#{m}
        def #{m}(*args, &block)
          puts self.class.name + ' ' + self.object_id.to_s + '.#{m}(' + args.map{|a| a.to_s}.join(',') + ')'
          _benchmark_#{m}(*args,&block)
        end
      end
      EOR
    end
    klass.class_eval(overriden_methods.join("\n"), __FILE__, __LINE__)
  end
end

i = Benchmark.instance
i.for(Integer, :upto)
i.for(A)
a = A.new
a.sum(5)
a.sum(3)