From db2603419800ec43d99cd20ef0f96b5bbdd7b67e Mon Sep 17 00:00:00 2001
From: Alex Rousskov <rousskov@measurement-factory.com>
Date: Sat, 11 Sep 2010 17:56:07 -0600
Subject: [PATCH] Added HttpMsg::Pointer typedef and convenience
 HttpMsg::Pointer operators.

---
 src/HttpMsg.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/HttpMsg.h b/src/HttpMsg.h
index 5d528e7cba..25e8928117 100644
--- a/src/HttpMsg.h
+++ b/src/HttpMsg.h
@@ -41,10 +41,16 @@
 
 // common parts of HttpRequest and HttpReply
 
+template <class Msg>
+class HttpMsgPointerT;
+
+
 class HttpMsg
 {
 
 public:
+    typedef HttpMsgPointerT<HttpMsg> Pointer;
+
     HttpMsg(http_hdr_owner_type owner);
     virtual ~HttpMsg();
 
@@ -198,6 +204,17 @@ public:
     HttpMsgPointerT(const HttpMsgPointerT &p): msg(p.msg) { lock(); }
     HttpMsgPointerT &operator =(const HttpMsgPointerT &p)
     { if (msg != p.msg) { unlock(); msg = p.msg; lock(); } return *this; }
+    HttpMsgPointerT &operator =(Msg *newM)
+    { if (msg != newM) { unlock(); msg = newM; lock(); } return *this; }
+
+    /// support converting a child msg pointer into a parent msg pointer
+    template <typename Other>
+    HttpMsgPointerT(const HttpMsgPointerT<Other> &o): msg(o.raw()) { lock(); }
+
+    /// support assigning a child msg pointer to a parent msg pointer
+    template <typename Other>
+    HttpMsgPointerT &operator =(const HttpMsgPointerT<Other> &o)
+    { if (msg != o.raw()) { unlock(); msg = o.raw(); lock(); } return *this; }
 
     Msg &operator *() { return *msg; }
     const Msg &operator *() const { return *msg; }
@@ -207,6 +224,9 @@ public:
     operator const Msg *() const { return msg; }
     // add more as needed
 
+    /// public access for HttpMsgPointerT copying and assignment; avoid
+    Msg *raw() const { return msg; }
+
 protected:
     void lock() { if (msg) HTTPMSGLOCK(msg); } ///< prevent msg destruction
     void unlock() { HTTPMSGUNLOCK(msg); } ///< allows/causes msg destruction
-- 
2.47.2