Ruby的装饰器模式实现
class Tree
def initialize
puts "Make a normal tree"
end
def decorate
puts "Make sure the tree won\'t fall"
end
end
class RedBalls < Tree
def initialize(tree)
@parent = tree;
end
def decorate
@parent.decorate
puts "Put on some red balls"
end
end
class BlueBalls < Tree
def initialize(tree)
@parent = tree;
end
def decorate
@parent.decorate
puts "Add blue balls"
end
end
class Angel < Tree
def initialize(tree)
@parent = tree;
end
def decorate
@parent.decorate
puts "An angel on the top"
end
end
tree = Angel.new(BlueBalls.new(RedBalls.new(Tree.new)))
tree.decorate
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Ruby 101：方法对象
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从方法调用说起
在上一篇文章里，我们看到调用对象的方法实质上是向对象发送消息，下面，我们再来看一个有趣的应用。在Ruby里，字典可以通过 {key => value} 来创建，如果你使用的版本是1.9或以上，当key的类型是Symbol时，创建字典的� ......
#include < ruby.h > //
static int id_sum;
int Values[] = {5, 10 ,15,-1,20,0};
static VALUE wrap_sum(VALUE args)
{
VALUE * values = (VALUE *) args;
VALUE summer = values[0];
VALUE max = values[1];
return rb_funcall(summer,id_sum,1,max);
}
static VALUE ......
While looking for information on the subject, I looked into the ONLamp article Extending Ruby with C by Garrett Rooney, the Extending Ruby chapter in the Pickaxe, README.EXT (located at /usr/share/doc/ruby1.8-dev/README.EXT.gz on my Ubuntu system) and got some help from Kjetil.
The resulting file c ......
最近在看John E.Hopcroft,Rajeev Motwani,Jeffrey D.Ullman 三巨头写的Introduction to Automata Theory,Language,and Computation，想写一个Turing 机验证一下自己写的状态转移函数对不对。懒得很，网上搜了几个不错的。但Ruby Quiz 上的这个最简单。
162 Turing 机
问题描述
Quiz
description by James Edward Gray ......
ruby on rails安装mysql数据库
1. 下载mysql软件
http://www.mysql.cn/
mysql中文官方网站下载安装软件，选择5.0
2. 安装mysql，设置默认字符集为utf-8
3. 下载mysql for ruby的驱动并安装
http://rubyforge.org/搜索mysql，找到mysql -win
点击下载，进入页面
http://rubyforge.org/frs/?group_id= ......
