Ruby 元编程编写代码的代码1.Kernel#eval2.0.0p247 :463 class String2.0.0p247 :464?def self.inherite
Ruby 元编程 编写代码的代码
1.Kernel#eval
2.0.0p247 :463 > class String2.0.0p247 :464?> def self.inherited(subclass)2.0.0p247 :465?> puts "钩子函数"2.0.0p247 :466?> end2.0.0p247 :467?> end => nil 2.0.0p247 :468 > class MyString < String;end钩子函数 => nil 2.0.0p247 :469 >