Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I want to create an instance of a class and place it in shared memory so the same instance can be called from multiple processes. However, this class has virtual methods which I think may cause problems as I have read the mapped data can’t contain pointers, which would be the case here with the vtable in the class. Will it work?
As Kerrek SB commented, you cannot map a class containing virtual methods. But you can probably make a simple struct or class without virtuals, map that, and then give a pointer to it to another class which does have virtuals and uses the plain struct as its implementation. Basically, the Pimpl idiom.
If needed, you can even do something like virtual dispatch yourself by storing a “type” integer in the plain struct, and inspecting it to decide which functions to invoke.