SERVER-32645 Create a shim helper framework.

The `MONGO_DECLARE_SHIM`, `MONGO_DEFINE_SHIM`, and `MONGO_REGISTER_SHIM`
macros can be used to create specialized types which are customization
and auto-registration points for late-binding functions.  In some
sense they work like weak-symbols; however, they also are useful for
tracking dependencies upon shimmed-out implementations.

1 files changed, 6 insertions, 6 deletions

diff --git a/src/mongo/db/catalog/collection_info_cache.h b/src/mongo/db/catalog/collection_info_cache.h
index 9bc07e80c61..6fb0fa5278e 100644
--- a/src/mongo/db/catalog/collection_info_cache.h
+++ b/src/mongo/db/catalog/collection_info_cache.h
@@ -28,6 +28,7 @@
 
 #pragma once
 
+#include "mongo/base/shim.h"
 #include "mongo/db/collection_index_usage_tracker.h"
 #include "mongo/db/query/plan_cache.h"
 #include "mongo/db/query/query_settings.h"
@@ -69,16 +70,15 @@ public:
                                    const std::set<std::string>& indexesUsed) = 0;
     };
 
-private:
-    static std::unique_ptr<Impl> makeImpl(Collection* collection, const NamespaceString& ns);
 
 public:
-    using factory_function_type = decltype(makeImpl);
-
-    static void registerFactory(stdx::function<factory_function_type> factory);
+    static MONGO_DECLARE_SHIM((Collection * collection,
+                               const NamespaceString& ns,
+                               PrivateTo<CollectionInfoCache>)
+                                  ->std::unique_ptr<Impl>) makeImpl;
 
     explicit inline CollectionInfoCache(Collection* const collection, const NamespaceString& ns)
-        : _pimpl(makeImpl(collection, ns)) {}
+        : _pimpl(makeImpl(collection, ns, PrivateCall<CollectionInfoCache>{})) {}
 
     inline ~CollectionInfoCache() = default;