From 9ae0bd3829a34d4239521d9c7838089395c2336c Mon Sep 17 00:00:00 2001
From: Francisco Jerez <currojerez@riseup.net>
Date: Tue, 18 Feb 2014 13:16:19 +0100
Subject: clover: Some improvements for the intrusive pointer class.

Define some additional convenience operators, clean up the
implementation slightly, and rename it to 'intrusive_ptr' for reasons
that will be obvious in the next commit.

Tested-by: Tom Stellard <thomas.stellard@amd.com>
---
 src/gallium/state_trackers/clover/util/pointer.hpp | 53 ++++++++++++++--------
 1 file changed, 35 insertions(+), 18 deletions(-)

(limited to 'src/gallium/state_trackers/clover/util')

diff --git a/src/gallium/state_trackers/clover/util/pointer.hpp b/src/gallium/state_trackers/clover/util/pointer.hpp
index f0c5b1618a5..b7a633b523c 100644
--- a/src/gallium/state_trackers/clover/util/pointer.hpp
+++ b/src/gallium/state_trackers/clover/util/pointer.hpp
@@ -57,35 +57,43 @@ namespace clover {
    /// clover::ref_counter interface.
    ///
    template<typename T>
-   class ref_ptr {
+   class intrusive_ptr {
    public:
-      ref_ptr(T *q = NULL) : p(NULL) {
-         reset(q);
+      intrusive_ptr(T *q = NULL) : p(q) {
+         if (p)
+            p->retain();
       }
 
-      ref_ptr(const ref_ptr<T> &ref) : p(NULL) {
-         reset(ref.p);
+      intrusive_ptr(const intrusive_ptr &ptr) :
+         intrusive_ptr(ptr.p) {
       }
 
-      ~ref_ptr() {
-         reset(NULL);
+      intrusive_ptr(intrusive_ptr &&ptr) :
+         p(ptr.p) {
+         ptr.p = NULL;
       }
 
-      void
-      reset(T *q = NULL) {
-         if (q)
-            q->retain();
+      ~intrusive_ptr() {
          if (p && p->release())
             delete p;
-         p = q;
       }
 
-      ref_ptr &
-      operator=(const ref_ptr &ref) {
-         reset(ref.p);
+      intrusive_ptr &
+      operator=(intrusive_ptr ptr) {
+         std::swap(ptr.p, p);
          return *this;
       }
 
+      bool
+      operator==(const intrusive_ptr &ref) const {
+         return p == ref.p;
+      }
+
+      bool
+      operator!=(const intrusive_ptr &ref) const {
+         return p != ref.p;
+      }
+
       T &
       operator*() const {
          return *p;
@@ -96,22 +104,31 @@ namespace clover {
          return p;
       }
 
+      T *
+      operator()() const {
+         return p;
+      }
+
       explicit operator bool() const {
          return p;
       }
 
+      explicit operator T *() const {
+         return p;
+      }
+
    private:
       T *p;
    };
 
    ///
    /// Transfer the caller's ownership of a reference-counted object
-   /// to a clover::ref_ptr smart pointer.
+   /// to a clover::intrusive_ptr smart pointer.
    ///
    template<typename T>
-   inline ref_ptr<T>
+   inline intrusive_ptr<T>
    transfer(T *p) {
-      ref_ptr<T> ref { p };
+      intrusive_ptr<T> ref { p };
       p->release();
       return ref;
    }
-- 
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