1 // Copyright 2016 PDFium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com 6 7 #ifndef CORE_FPDFAPI_PAGE_CPDF_COUNTEDOBJECT_H_ 8 #define CORE_FPDFAPI_PAGE_CPDF_COUNTEDOBJECT_H_ 9 10 #include <memory> 11 12 #include "core/fpdfapi/page/cpdf_colorspace.h" 13 #include "core/fpdfapi/page/cpdf_pattern.h" 14 #include "core/fxcrt/fx_system.h" 15 16 template <class T> 17 class CPDF_CountedObject { 18 public: 19 explicit CPDF_CountedObject(std::unique_ptr<T> ptr) 20 : m_nCount(1), m_pObj(ptr.release()) {} 21 void reset(std::unique_ptr<T> ptr) { // CAUTION: tosses prior ref counts. 22 m_nCount = 1; 23 m_pObj = ptr.release(); 24 } 25 void clear() { // Now you're all weak ptrs ... 26 // Guard against accidental re-entry. 27 T* pObj = m_pObj; 28 m_pObj = nullptr; 29 delete pObj; 30 } 31 T* get() const { return m_pObj; } 32 T* AddRef() { 33 ASSERT(m_pObj); 34 ++m_nCount; 35 return m_pObj; 36 } 37 void RemoveRef() { 38 if (m_nCount) 39 --m_nCount; 40 } 41 size_t use_count() const { return m_nCount; } 42 43 protected: 44 size_t m_nCount; 45 T* m_pObj; 46 }; 47 using CPDF_CountedColorSpace = CPDF_CountedObject<CPDF_ColorSpace>; 48 using CPDF_CountedPattern = CPDF_CountedObject<CPDF_Pattern>; 49 50 #endif // CORE_FPDFAPI_PAGE_CPDF_COUNTEDOBJECT_H_ 51
