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Would the following code facilitate lazy initialization?
Or would the singletonInstance be created as soon as somebody includes the header (or even at program startup time)?
class SingletonClass
{
private:
SingletonClass();
~SingletonClass();
public:
static const SingletonClass& Instance()
{
static SingletonClass singletonInstance;
return singletonInstance;
}
};
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Singleton Class in Java using Lazy LoadingThe instance could be initialized only when the Singleton Class is used for the first time. Doing so creates the instance of the Singleton class in the JVM Java Virtual Machine during the execution of the method, which gives access to the instance, for the first time.
What is lazy and early loading of Singleton and how will you implement it in java? Both these refer to when the Singleton object gets created in the application. In lazy loading it is created only when the method creating the instance is first called. In early loading the instance is created once the class is loaded.
Lazy initialization is technique were we restrict the object creation until its created by application code. This saves the memory from redundant objects which some time may be very big/heavy. In other way eager initialization creates the object in advance and just after starting the application or module.
In situations like on-demand object creation where we create an object of the class only when it is accessed, lazy initialization works very well. It helps application load faster because it does not depend upon instance creation at the time of application startup.
This is known as the Meyers singleton and they are lazy instantiated.
There are some considerations:
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The SingletonClass constructor will not be called earlier than somenone calls the Instance() method.
Thus yes, it facilitates lazy initialization.
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