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changeset 1746:826e0cb77d8e by-id

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Add isa
author Chris Cannam
date Tue, 02 Jul 2019 15:28:46 +0100
parents 074b860a7828
children 498b426191e5
files base/ById.h
diffstat 1 files changed, 12 insertions(+), 1 deletions(-) [+]
line wrap: on
line diff
--- a/base/ById.h	Tue Jul 02 14:08:25 2019 +0100
+++ b/base/ById.h	Tue Jul 02 15:28:46 2019 +0100
@@ -121,9 +121,15 @@
 public:
     static void add(int, std::shared_ptr<WithId>);
     static void release(int);
-    static std::shared_ptr<WithId> get(int);
+    static std::shared_ptr<WithId> get(int); 
 
     template <typename Derived>
+    static bool isa(int id) {
+        std::shared_ptr<WithId> p = get(id);
+        return bool(std::dynamic_pointer_cast<Derived>(p));
+    }
+   
+    template <typename Derived>
     static std::shared_ptr<Derived> getAs(int id) {
         std::shared_ptr<WithId> p = get(id);
         return std::dynamic_pointer_cast<Derived>(p);
@@ -154,6 +160,11 @@
     }
 
     template <typename Derived>
+    static bool isa(Id id) {
+        return AnyById::isa<Derived>(id.untyped);
+    }
+
+    template <typename Derived>
     static std::shared_ptr<Derived> getAs(Id id) {
         return AnyById::getAs<Derived>(id.untyped);
     }