如何为类方法创建别名?方法是使用class << self。
看下面的例子,需要覆盖TestClass.add方法
class TestClass
def self.add(aa)
puts “add #{aa}”
end
end
#开始打补丁
class TestClass
class << self
alias_method :add1, :add
end
#覆盖TestClass.add方法
def TestClass.add(aa)
puts “cc”
TestClass.add1(aa)
end
end
TestClass.add “bb”
分享到:
相关推荐
Bug with processing a field with alias for query with the JOIN statement is fixed Bug with date and time fractional seconds precision when DescribeParams = True is fixed MySQL data provider Azure ...
Bug with processing a field with alias for query with the JOIN statement is fixed Bug with date and time fractional seconds precision when DescribeParams = True is fixed MySQL data provider Azure ...
Bug with processing a field with alias for query with the JOIN statement is fixed Bug with date and time fractional seconds precision when DescribeParams = True is fixed MySQL data provider Azure ...
The main reason for making a virtual function inline is to place its definition in the class, either for convenience or to document its behavior, e.g., for accessors and mutators. The -inl.h Files...
这个想法是最终允许元编程与Python装饰器一起使用,而不必过多使用alias_method等。 换句话说,保留super /继承/方法重写。 尽管它是非常非常具有实验性的,并且有一些警告,但是它大部分都可以工作。 与创建的方法...
Bug with processing a field with alias for query with the JOIN statement is fixed Bug with date and time fractional seconds precision when DescribeParams = True is fixed MySQL data provider Azure ...
alias_method :output, :method1 end monkey = Monkey.new monkey.output ``` 2. **include**:将一个模块包含到类中,以添加模块中的所有方法。例如,创建一个`Helper`模块,包含到`Monkey`类中: ```...
其中,`alias`是类的别名,`fully\\qualified\\class_name`是完整的类名(包括命名空间)。 - **示例**: ```php Container::set('demo2', '\app\common\Demo'); ``` 上述代码将`\app\common\Demo`这个类...
As SAFEARRAYBOUND End Type Private Declare Function VarPtrArray Lib "msvbvm50.dll" Alias "VarPtr" (Ptr() As Any) As Long Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory...
可能是指`alias`或`using`指令,用于简化命名空间的引用。 #### 20. 如何释放非托管资源? - 使用`Dispose`模式或者`using`语句来确保资源得到正确释放。 ```csharp using (var stream = File.OpenRead("file....
19. **别名指示符(using alias directive)** - 使用using关键字为命名空间或类型创建别名,简化代码。 ```csharp using Sys = System; Sys.Console.WriteLine("Hello, World!"); // 等价于 System.Console....
class Accounts def reading_charge end def self.return_date end end ``` 上述代码中,`return_date` 方法可以通过类名直接访问,无需实例化类。 #### Ruby alias 语句 `alias` 语句用于为现有方法创建别名...
<bean id="bean3" class="cn.javass.spring.chapter2.HelloApiStaticFactory" factory-method="newInstance"> !"/> ``` 3. **使用实例工厂方式实例化** ```xml <bean id="factory" class=...
1. **alias_method** 和 **alias_method_chain**:这是过去常见的方法,通过别名来实现方法调用前后的额外操作。然而,这种方式需要手动管理别名,而且在Ruby 2.3之后,`alias_method_chain`不再推荐使用。 2. 使用...
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <servlet-name>spring <url-pattern>/ <listener-class>org.springframework.web.context.ContextLoaderListener...
MyClass.classMethod() // 输出 "This is a class method." MyClass.staticMethod() // 输出 "This is a static method." ``` 以上介绍了 Swift 中的一些基本而重要的新元素和技术点。接下来将继续探索更多高级功能...
<bean id="examplebean" class="example.example" factory-method="createInstance" /> ``` 而对于非静态工厂方法,我们需要指定`factory-bean`属性,指明工厂bean的id,如: ```xml <bean id="factory" class=...
hibernate.proxool.pool_alias pool1 ## Only need one of the following #hibernate.proxool.existing_pool true #hibernate.proxool.xml proxool.xml #hibernate.proxool.properties proxool.properties ####...
In this chapter, you'll use DTrace to hook objc_msgSend's entry probe and pull out the class name along with the Objective-C selector for that class. By the end of this chapter, you'll have LLDB ...