c++ singleton 每次都创建新实例吗？

Question

C++ singleton code looks like this:

MyClass& MyClass::getInstance(){
    static MyClass instance;
    return instance;
}

Looking specifically at static MyClass instance;

Is a new instance created each time getInstance is called?

Answer 1

Because the MyClass member variable is declared as static and you are returning a reference to it, not a copy. Static member variables are not created per-object like normal member variables; rather, there is one instance of the variable accessible from all objects of the class.

See here.