AU/PM: Easier destruction of provider variables
This affords as simple, automated and safe destruction of global
Variable pointer.
* We define a ScopedPtrVarCloser<T> class, which frees and nullifies the
pointer it is pointing to. This is placed in provider_utils.h (for
now), for use by provider implementations.
* Accordingly, it is straightforward to define a closer member in
a concrete provider implementation via the typeof directive (see
random_provider.h).
* It's now safe to remove trivial desctructors in Providers, e.g. the
one of RandomProvider.
BUG=None
TEST=Builds and passes unit tests.
Change-Id: I956a0b28a6ae6d1e22e669fdc4f28e9ac5c67415
Reviewed-on: https://chromium-review.googlesource.com/184353
Tested-by: Gilad Arnold <garnold@chromium.org>
Reviewed-by: Alex Deymo <deymo@chromium.org>
Commit-Queue: Gilad Arnold <garnold@chromium.org>
diff --git a/policy_manager/variable.h b/policy_manager/variable.h
index 79953ed..22039c0 100644
--- a/policy_manager/variable.h
+++ b/policy_manager/variable.h
@@ -12,7 +12,8 @@
namespace chromeos_policy_manager {
-// Interface to a Policy Manager variable to be implemented by the providers.
+// Interface to a Policy Manager variable. Implementation internals are hidden
+// as protected members, since policies should not be using them directly.
template<typename T>
class Variable {
public: