Ruby中7种定义类方法的方式

class SomeClass

#method 1

def SomeClass.ClassMethod1

end

def self.ClassMethod2

end

#method 2

class << self

def ClassMethod3

end

end

end

SomeClass.instance_eval do

#method 3

def ClassMethod4

end

#method 4

define_method(:symbol, )

end

#method 5

SomeClass.class_eval do

def self.ClassMethod5

end

#method 6

class << self

def ClassMethod6

end

end

end

#method 7 - dynamically define a class method at run time

def add_class_method(c, m, &b)

eigenclass = class << c; self; end

eigenclass.class_eval {

define_method(m, &b)

}

end

Ruby真的是太灵活了，要驾驭Ruby的灵活真不容易。