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2016-02-04 Eliminate the "store" global variableEelco Dolstra1-2/+2
Also, move a few free-standing functions into StoreAPI and Derivation. Also, introduce a non-nullable smart pointer, ref<T>, which is just a wrapper around std::shared_ptr ensuring that the pointer is never null. (For reference-counted values, this is better than passing a "T&", because the latter doesn't maintain the refcount. Usually, the caller will have a shared_ptr keeping the value alive, but that's not always the case, e.g., when passing a reference to a std::thread via std::bind.)
2015-05-21 nix-collect-garbage: Don't call nix-envEelco Dolstra1-0/+82
Also, make sure --delete-older-than doesn't delete the current generation.
2015-05-21 Move profiles.{cc,hh} to libstoreEelco Dolstra1-0/+155