Internal implementation of Typeid() operator

Maybe - by default constructor ? :)

typeid is a keyword exactly like sizeof in native C/C++. It is not a function or a class. Therefore, there is no copy-constructor, nor = operator behind this.

CPallini's answer should be enough: you can't know how it works internally and even don't need to.

i am asking how typeid is internally creating object for the type_info class?

From MSDN: You cannot instantiate objects of the type_info class directly, because the class has only a private copy constructor. The only way to construct a (temporary) type_info object is to use the typeid operator. Since the assignment operator is also private, you cannot copy or assign objects of class type_info.

But they don't give details on how they instanciate the object (why would they actualy?). Anyway, there are several ways to achieve this. For example you can make your constructor internal. This makes instanciation possible only from the assembly where the type is defined.

Since you get a reference in return, the object must exist statically. So it's most likely this is technically a singleton object, although it may not be implemented as such. (but the private assignment and constructor indicate that it is).

There are typically two ways to create a singleton instance:

1. either you provide a static function in the class that does it for you - as a class function it can access the private constructor.

2. or you create a static variable outside of the class. But with the constructor private, this requires either a friend declaration or some nastier tricks, e. g. by using malloc to allocate it and memcpy to 'assign' the member variables. I wouldn't be surprised if that is what MS did. But we'll never know ;)