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authortsepez <tsepez@chromium.org>2016-09-22 13:42:34 -0700
committerCommit bot <commit-bot@chromium.org>2016-09-22 13:42:34 -0700
commitfe0179ded8202939ea4f2b92a879b8dede7821ea (patch)
tree0d8dc52910041d8da0f2039018403dedf3c7332e /core/fxcrt/include
parenta939bfe3e102bfb28b4e8a5d951333d16badf80b (diff)
downloadpdfium-fe0179ded8202939ea4f2b92a879b8dede7821ea.tar.xz
Rename CPDF_CountedObject to CFX_WeakPtr::Handlechromium/2869
This better describes its purpose, and reduces confusion with the CFX_CountRef class, which is unrelated. The WeakPtr class itself that manipulates handles is NYI. Review-Url: https://codereview.chromium.org/2366673003
Diffstat (limited to 'core/fxcrt/include')
-rw-r--r--core/fxcrt/include/cfx_weak_ptr.h48
1 files changed, 48 insertions, 0 deletions
diff --git a/core/fxcrt/include/cfx_weak_ptr.h b/core/fxcrt/include/cfx_weak_ptr.h
new file mode 100644
index 0000000000..ea71cd01fd
--- /dev/null
+++ b/core/fxcrt/include/cfx_weak_ptr.h
@@ -0,0 +1,48 @@
+// Copyright 2016 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef CORE_FXCRT_INCLUDE_CFX_WEAK_PTR_H_
+#define CORE_FXCRT_INCLUDE_CFX_WEAK_PTR_H_
+
+#include "core/fxcrt/include/fx_system.h"
+
+template <class T>
+class CFX_WeakPtr {
+ public:
+ class Handle {
+ public:
+ explicit Handle(T* ptr) : m_nCount(1), m_pObj(ptr) {}
+ void reset(T* ptr) { // CAUTION: tosses prior ref counts.
+ m_nCount = 1;
+ m_pObj = ptr;
+ }
+ void clear() { // Now you're all weak ptrs ...
+ // Guard against accidental re-entry.
+ T* pObj = m_pObj;
+ m_pObj = nullptr;
+ delete pObj;
+ }
+ T* get() const { return m_pObj; }
+ T* AddRef() {
+ ASSERT(m_pObj);
+ ++m_nCount;
+ return m_pObj;
+ }
+ void RemoveRef() {
+ if (m_nCount)
+ --m_nCount;
+ }
+ size_t use_count() const { return m_nCount; }
+
+ protected:
+ size_t m_nCount;
+ T* m_pObj;
+ };
+
+ // TODO(tsepez): implement weak pointer operations themselves.
+};
+
+#endif // CORE_FXCRT_INCLUDE_CFX_WEAK_PTR_H_