lighttroupe/luz

# reuses structs to prevent garbage production
class StructStack
    def initialize(klass)
        @class = klass
    end

    def pop(*args)
        @available_stack ||= []
        @used_hash ||= {}

        if @available_stack.empty?
            obj = @class.new(*args)
        else
            obj = @available_stack.pop
            args.each_with_index { |arg, i| obj[i] = arg }
        end
        @used_hash[obj] = true
        return obj
    end

    def push(obj)
        @available_stack << obj
        @used_hash.delete(obj)
    end
end