I have a static link library project A, which contains files MyClass.h and MyClass.cpp. It defines a class and I want to use static member variables in the constructor. I have defined another project B to test this static link library and found that using the value of static member variables in the constructor and initializing the value of static member variables outside the class. If it is an int type, this value is initialized and accessible, but if it is a std: string or other non primitive type, the value does not exist. Why is this happening. Here are project A MyClass.h:
A MyClass.h:

Using the value of a static member variable in a constructor, initializing the value of the static member variable outside the class. If it is of type int, the value is initialized and accessible, but if it is of type std:: string or other non primitive types, the value does not exist. Why is this.
Here are my header files and CPP files：

Using the value of a static member variable in a constructor, initializing the value of the static member variable outside the class. If it is of type int, the value is initialized and accessible, but if it is of type std:: string or other non primitive types, the value does not exist. Why is this.
Here are my header files and CPP files：

Recently I was looking at the source code of Stream.CopyToAsync, which is available here on github.

For example, I was writing an enum→string function.

Consider you have one class entity which needs a reference to another class data and you would store multiple of this classes entity in a vector in class data, you might end up with some code like this: