Add support for unique_ptr and shared_ptr to memusage

sipa · furszy · commit bdd5221cf67e · 2020-10-13T11:11:06.000-03:00
diff --git a/src/memusage.h b/src/memusage.h
@@ -80,6 +80,15 @@ struct stl_tree_node
     X x;
 };
 
+struct stl_shared_counter
+{
+    /* Various platforms use different sized counters here.
+     * Conservatively assume that they won't be larger than size_t. */
+    void* class_type;
+    size_t use_count;
+    size_t weak_count;
+};
+
 template<typename X>
 static inline size_t DynamicUsage(const std::vector<X>& v)
 {
@@ -158,6 +167,21 @@ static inline size_t RecursiveDynamicUsage(const std::pair<X, Y>& v)
     return RecursiveDynamicUsage(v.first) + RecursiveDynamicUsage(v.second);
 }
 
+template<typename X>
+static inline size_t DynamicUsage(const std::unique_ptr<X>& p)
+{
+    return p ? MallocUsage(sizeof(X)) : 0;
+}
+
+template<typename X>
+static inline size_t DynamicUsage(const std::shared_ptr<X>& p)
+{
+    // A shared_ptr can either use a single continuous memory block for both
+    // the counter and the storage (when using std::make_shared), or separate.
+    // We can't observe the difference, however, so assume the worst.
+    return p ? MallocUsage(sizeof(X)) + MallocUsage(sizeof(stl_shared_counter)) : 0;
+}
+
 // Boost data structures
 
 template<typename X>
