Context: add GenContext templated on the callback argument

Signed-off-by: Samuel Just <sam.just@inktank.com>

diff --git a/src/include/Context.h b/src/include/Context.h
index 9ec4414a047c0b4aa8bac7f2b15b74062aa1607e..663313ceec172fa9b507446e5b67ee04c7025153 100644 (file)
--- a/src/include/Context.h
+++ b/src/include/Context.h
@@ -27,6 +27,26 @@
 
 #define mydout(cct, v) lgeneric_subdout(cct, context, v)
 
+/*
+ * GenContext - abstract callback class
+ */
+template <typename T>
+class GenContext {
+  GenContext(const GenContext& other);
+  const GenContext& operator=(const GenContext& other);
+
+ protected:
+  virtual void finish(T t) = 0;
+
+ public:
+  GenContext() {}
+  virtual ~GenContext() {}       // we want a virtual destructor!!!
+  virtual void complete(T t) {
+    finish(t);
+    delete this;
+  }
+};
+
 /*
  * Context - abstract callback class
  */