    # CStruct Examples
    require 'cstruct'

    # example:
    # struct Window in C\C++ (32-bit platform):
    #
    # struct Window
    # {
    #    int style;
    #    struct{
    #       int x;
    #       int y;
    #    }position; /* position is anonymous struct's instance */
    # };

    # struct Window in Ruby:
    class Window < CStruct
        int32:style
        struct :position do
            int32:x
            int32:y
        end
    end
    # or like this (use brace):
    # class Window < CStruct
    #    int32:style
    #    struct (:position) {
    #        int32:x
    #        int32:y
    #    }
    # end

    # create a Window's instance
    window = Window.new

    # assign like as C language
    window.style = 1
    window.position.x = 10
    window.position.y = 10

    puts "sizeof(Window) = #{Window.__size__}" # "__size__" is alias of "size"
    puts "window.style = #{window.style},window.position.x = #{window.position.x},window.position.y = #{window.position.y}"