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author | tsepez <tsepez@chromium.org> | 2016-03-29 15:04:21 -0700 |
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committer | Commit bot <commit-bot@chromium.org> | 2016-03-29 15:04:21 -0700 |
commit | 602aebc11a615971800d38f8d427a4e4f95c1134 (patch) | |
tree | ec995b42d2811f00064195e5ffe4ebf4feb4af81 /core/fxcrt/include/cfx_retain_ptr.h | |
parent | bd56755ba86f2d87e24a3cee5cb92aa14a81bb27 (diff) | |
download | pdfium-602aebc11a615971800d38f8d427a4e4f95c1134.tar.xz |
Add a Retained Pointer smart class.
It's going to be hard to fix some XFA object leaks without
this. Put this in fxcrt/ as we should be able to make the
FX strings take advantage of this.
BUG=pdfium:55
Review URL: https://codereview.chromium.org/1805683002
Diffstat (limited to 'core/fxcrt/include/cfx_retain_ptr.h')
-rw-r--r-- | core/fxcrt/include/cfx_retain_ptr.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/core/fxcrt/include/cfx_retain_ptr.h b/core/fxcrt/include/cfx_retain_ptr.h new file mode 100644 index 0000000000..25edd585cb --- /dev/null +++ b/core/fxcrt/include/cfx_retain_ptr.h @@ -0,0 +1,57 @@ +// 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. + +#ifndef CORE_FXCRT_INCLUDE_CFX_RETAIN_PTR_H_ +#define CORE_FXCRT_INCLUDE_CFX_RETAIN_PTR_H_ + +#include <memory> + +#include "core/fxcrt/include/fx_memory.h" + +template <class T> +class CFX_RetainPtr { + public: + explicit CFX_RetainPtr(T* pObj) : m_pObj(pObj) { + if (m_pObj) + m_pObj->Retain(); + } + + CFX_RetainPtr() : CFX_RetainPtr(nullptr) {} + CFX_RetainPtr(const CFX_RetainPtr& that) : CFX_RetainPtr(that.Get()) {} + CFX_RetainPtr(CFX_RetainPtr&& that) { Swap(that); } + + template <class U> + CFX_RetainPtr(const CFX_RetainPtr<U>& that) + : CFX_RetainPtr(that.Get()) {} + + void Reset(T* obj = nullptr) { + if (obj) + obj->Retain(); + m_pObj.reset(obj); + } + + T* Get() const { return m_pObj.get(); } + void Swap(CFX_RetainPtr& that) { m_pObj.swap(that.m_pObj); } + + CFX_RetainPtr& operator=(const CFX_RetainPtr& that) { + if (*this != that) + Reset(that.Get()); + return *this; + } + + bool operator==(const CFX_RetainPtr& that) const { + return Get() == that.Get(); + } + + bool operator!=(const CFX_RetainPtr& that) const { return !(*this == that); } + + operator bool() const { return !!m_pObj; } + T& operator*() const { return *m_pObj.get(); } + T* operator->() const { return m_pObj.get(); } + + private: + std::unique_ptr<T, ReleaseDeleter<T>> m_pObj; +}; + +#endif // CORE_FXCRT_INCLUDE_CFX_RETAIN_PTR_H_ |