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In C++ I can use typeid operator to retrieve the name of any polymorphic class:
const char* name = typeid( CMyClass ).name();
How long will the string pointed to by the returned const char* pointer available to my program?
As long as the class with rtti exists. So if you deal with single executable – forever.
But for classes in a Dynamic Link Librariy it shifts a little. Potentially you can unload it.