How to choose type at runtime?

Question

C++ / C#

I looked at type traits and RTTI , but as far as I understand, RTTI only determines the type, and type traits work only at compile-time.

For example, I get a value at runtime, and I need to define a variable of the required type depending on this. How?

Answer 1

1. Pass information about the type in some form along with the value
2. Determine the type by the content, if possible.