Archive for November 4th, 2011


JG Questions

1. What is the Pimpl Idiom, and why is it useful?

Guru Questions

2. What is the best way to express the basic Pimpl Idiom in C++11?

3. What parts of the class should go into the impl object? Some potential options include:

  • put all private data (but not functions) into impl;
  • put all private members into impl;
  • put all private and protected members into impl;
  • put all private nonvirtual members into impl;
  • put everything into impl, and write the public class itself as only the public interface, each implemented as a simple forwarding function (a handle/body variant).

What are the advantages/drawbacks of each? How would you choose among them?

4. Does the impl require a back pointer to the public object? If yes, what is the best way to provide it? If not, why not?

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