let's rake it!

in Rakefile:

inputs = Dir.glob('*.erb')
outputs = inputs.map{|o| o[0..-5]}

task :default => [:begin, outputs, :end].flatten
task :begin do; puts "processing templates: #{inputs.inspect}"; end
task :end do; puts "processed output: #{outputs.inspect}"; end

inputs.zip(outputs).each{ |input, output|
  file output => input do
    open output, 'w' do |o|
      o << `erb #{input}`
    end
  end
}

把所有的 *.erb 轉出來，這樣就能輕鬆玩 meta-programming 了...
到時候可以寫一些 C++ getter/setter 的 generator,
或是 template parameter 吧..?