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author | dsinclair <dsinclair@chromium.org> | 2016-09-29 13:59:29 -0700 |
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committer | Commit bot <commit-bot@chromium.org> | 2016-09-29 13:59:29 -0700 |
commit | a52ab741019342fbca0468e43a01deb44fa5f1bd (patch) | |
tree | 9b1deef3b8deb23d65bf56348b220fe59dcd3169 /core/fxcrt/include/cfx_count_ref.h | |
parent | 8a4e286e686c3027f382afb07d3ddcec4610fdd9 (diff) | |
download | pdfium-a52ab741019342fbca0468e43a01deb44fa5f1bd.tar.xz |
Move core/fxcrt/include to core/fxcrt
BUG=pdfium:611
Review-Url: https://codereview.chromium.org/2382723003
Diffstat (limited to 'core/fxcrt/include/cfx_count_ref.h')
-rw-r--r-- | core/fxcrt/include/cfx_count_ref.h | 81 |
1 files changed, 0 insertions, 81 deletions
diff --git a/core/fxcrt/include/cfx_count_ref.h b/core/fxcrt/include/cfx_count_ref.h deleted file mode 100644 index a879967b28..0000000000 --- a/core/fxcrt/include/cfx_count_ref.h +++ /dev/null @@ -1,81 +0,0 @@ -// 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_COUNT_REF_H_ -#define CORE_FXCRT_INCLUDE_CFX_COUNT_REF_H_ - -#include "core/fxcrt/include/cfx_retain_ptr.h" -#include "core/fxcrt/include/fx_system.h" - -// A shared object with Copy on Write semantics that makes it appear as -// if each one were independent. -template <class ObjClass> -class CFX_CountRef { - public: - CFX_CountRef() {} - CFX_CountRef(const CFX_CountRef& other) : m_pObject(other.m_pObject) {} - ~CFX_CountRef() {} - - template <typename... Args> - ObjClass* Emplace(Args... params) { - m_pObject.Reset(new CountedObj(params...)); - return m_pObject.Get(); - } - - CFX_CountRef& operator=(const CFX_CountRef& that) { - if (*this != that) - m_pObject = that.m_pObject; - return *this; - } - - void SetNull() { m_pObject.Reset(); } - const ObjClass* GetObject() const { return m_pObject.Get(); } - - template <typename... Args> - ObjClass* GetPrivateCopy(Args... params) { - if (!m_pObject) - return Emplace(params...); - if (!m_pObject->HasOneRef()) - m_pObject.Reset(new CountedObj(*m_pObject)); - return m_pObject.Get(); - } - - bool operator==(const CFX_CountRef& that) const { - return m_pObject == that.m_pObject; - } - bool operator!=(const CFX_CountRef& that) const { return !(*this == that); } - explicit operator bool() const { return !!m_pObject; } - - private: - class CountedObj : public ObjClass { - public: - template <typename... Args> - CountedObj(Args... params) : ObjClass(params...), m_RefCount(0) {} - - CountedObj(const CountedObj& src) : ObjClass(src), m_RefCount(0) {} - ~CountedObj() { m_RefCount = 0; } - - bool HasOneRef() const { return m_RefCount == 1; } - void Retain() { m_RefCount++; } - void Release() { - ASSERT(m_RefCount); - if (--m_RefCount == 0) - delete this; - } - - private: - // To ensure ref counts do not overflow, consider the worst possible case: - // the entire address space contains nothing but pointers to this object. - // Since the count increments with each new pointer, the largest value is - // the number of pointers that can fit into the address space. The size of - // the address space itself is a good upper bound on it. - intptr_t m_RefCount; - }; - - CFX_RetainPtr<CountedObj> m_pObject; -}; - -#endif // CORE_FXCRT_INCLUDE_CFX_COUNT_REF_H_ |