动态设置类变量所使用到的方法为:class_variable_set和class_variable_get。实例: class Person (1..3).each do |num| class_variable_set("@@name_#{num}".to_sym, num * 3) end def initialize (1..3).each do |num| instance_variable_set("@name_#{num}".to_sym, self.class.class_variab...
p obj.instance_variable_set("@foo",1)# => 1 p obj.instance_variable_set(:@foo,2)# => 2 p obj.instance_variable_get(:@foo)# => 2
Much like instance methods, you can also use instance variables. Instance variables are variables that are scoped to the entire class. This means that once an instance variable is defined, it can be used anywhere in that object. An instance variable looks just like a regular variable, with on...
/usr/bin/ruby -w#定义类classBox#构造器方法definitialize(w,h)@width,@height=w,hend#访问器方法defgetWidth@widthenddefgetHeight@heightend#设置器方法defsetWidth=(value)@width=valueenddefsetHeight=(value)@height=valueendend#创建对象box=Box.new(10,20)#使用设置器方法box.setWidth=30box.setHeight...
class_eval do define_method "#{attribute}=" do |value| instance_variable_set("@#{attribute}", value) end define_method attribute do instance_variable_get "@#{attribute}" end end end add_checked_attribute(Person, :age) add_checked_attribute(Person, :sex) me = Person.new me.age = 18...
This is a new C-API set to exchange a raw memory area, such as a numeric array and a bitmap image, between extension libraries. The extension libraries can share also the metadata of the memory area that consists of the shape, the element format, and so on. Using these kinds of metad...
It is currently autoloaded via the Set constant or a call to Enumerable#to_set. String String#byteindex and String#byterindex have been added. [Feature #13110] Update Unicode to Version 15.0.0 and Emoji Version 15.0. [Feature #18639] ...
benchmark Implement Set as a core class Apr 26, 2025 bin Resync prism delete bin/dot Nov 15, 2023 bootstraptest YJIT: Fix potential infinite loop when OOM (GH-13186) Apr 28, 2025 ccan Initialize loop variable of ccan_list_for_each Dec 24, 2023 ...
Having the Anaconda set of Python tools on the system isknown to cause issueswith building Ruby, often resulting in compilation errors mentioning thenmutility: error: nm: invalid argument -- Usage: nm [-agnopruUmxjlfAPL[s segname sectname] [-] [-t format] [[-arch <arch_flag>] ......
Here we use Ruby’sinstance_variable_getmethod to read an instance variable with an arbitrary name, andinstance_variable_setto assign a new value to it. Unfortunately the variable name must be prefixed with an “@” sign in both cases—hence the string interpolation. ...