#2701: Use `std::shared_ptr` in Piraha

Reporter: Erik Schnetter Status: new Milestone: Version: Type: enhancement Priority: major Component: Cactus

Replace the self-implemented `smart_ptr` with `std::shared_ptr` . This does not change any behaviour, but simplifies the code.

See [https://bitbucket.org/cactuscode/cactus/pull-requests/149%5D(https://bitbuck...) .

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-- Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2701/use-std-shared_ptr...