C ++ typename为变量

Question

Suppose I have a template class MyClass. Is it possible to store the type of the template as an variable of the class? If so how? I'm curious if it's possible to do something like this.

Template <typename T> class MyClass;
Template <typename T> class AnotherClass;

MyClass<int> myClassInstance;
AnotherClass<oneInstance.functionThatReturnsTheStoredTypeFromAnInstanceVariableOfMyClass()> anotherClassInstance;

Thanks in advance.

Answer 1

They can be static variables, you can nest typedefs.

template<typename T> class MyClass {
public:
    typedef T type;
};
AnotherClass<MyClass<double>::type> anotherClassInstance;

However, accessing a member variable like you posted is impossible in C++.