Or a reference type variable might not hold a reference to any object, in which case it is said to be a null reference or a reference to Nothing.
或者，引用类型变量可能不存放对任何对象的引用，这种情况称为空引用。
This paper tentatively analyzes the realization mechanism of a reference type variable in C, and compares reference and pointer so as to deepen the comprehension of reference.
为准确理解C语言引用的本质，对C语言引用型变理的实现机制进行了初步探讨。
The rule project can reference the CEIEventBOM module and define a variable with type ilog.connector.ibm.runtime.EventContainer to emit CEI events to Process Server.
规则项目可以引用 CEIEventBOM模块并定义一个ilog.connector.ibm.runtime.EventContainer类型的变量，从而把CEI事件发送给 Process Server。
GCC permits the identification of a type through the reference to a variable.
GCC允许通过变量的引用识别类型。
Hence a variable of a class type can reference an instance of any descendant type.
因此，类类型的变量可以引用其所有子孙类型的实例。
This means that if a variable is declared to be the type of an interface, its value can reference any object that is instantiated from any class that implements the interface.
这意味着，如果一个变量被声明为接口类型，其值可参考，即实例化任何实现接口的类的任何对象。
How to reference a variable without knowing the specific type?
如何引用变量而不知道具体的类型？
At run time, which version of the method will be invoked is based on the type of actual object stored in that reference variable and not on the type of the reference variable.
在运行时，该版本的方法将被调用是基于存储在引用变量并没有对参考变量的类型对象的实际类型。
At run time, which version of the method will be invoked is based on the type of actual object stored in that reference variable and not on the type of the reference variable.
在运行时，该版本的方法将被调用是基于存储在引用变量并没有对参考变量的类型对象的实际类型。
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