Tuesday, 5 March 2019

C++ Factory Create Shared Pointer - Private Constructors

Back in 2016, I posted this little ditty about hiding the constructors but still enabling the use of "make_shared", this worked through a friendship between your class and the ref counter, but was sadly windows only.


At the time I promised the follow up for the same code for GNU, well I forgot, so here's the secret sauce, make your class as per that post, but friend it thus:

friend class __gnu_cxx::new_allocator<Foo>;

This only came up as I showed a colleague today and realized, I never got around to posting the other item!

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