author | KUDr |
Sat, 13 Jan 2007 16:23:24 +0000 | |
changeset 5645 | ee435eb9a180 |
parent 5633 | e1905dacc378 |
child 6390 | 802629b3c7f1 |
permissions | -rw-r--r-- |
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/* $Id$ */ |
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#ifndef AUTOCOPYPTR_HPP |
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#define AUTOCOPYPTR_HPP |
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#if 0 // reenable when needed |
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/** CAutoCopyPtrT - kind of CoW (Copy on Write) pointer. |
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* It is non-invasive smart pointer (reference counter is held outside |
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* of Tdata). |
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* When copied, its new copy shares the same underlaying structure Tdata. |
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* When dereferenced, its behavior depends on 2 factors: |
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* - whether the data is shared (used by more than one pointer) |
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* - type of access (read/write) |
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* When shared pointer is dereferenced for write, new clone of Tdata |
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* is made first. |
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* Can't be used for polymorphic data types (interfaces). |
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*/ |
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template <class Tdata_> |
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class CAutoCopyPtrT { |
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protected: |
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typedef Tdata_ Tdata; |
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struct CItem { |
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int m_ref_cnt; ///< reference counter |
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Tdata m_data; ///< custom data itself |
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FORCEINLINE CItem() : m_ref_cnt(1) {}; |
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FORCEINLINE CItem(const Tdata& data) : m_ref_cnt(1), m_data(data) {}; |
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FORCEINLINE CItem(const CItem& src) : m_ref_cnt(1), m_data(src.m_data) {}; |
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}; |
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mutable CItem* m_pI; ///< points to the ref-counted data |
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public: |
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FORCEINLINE CAutoCopyPtrT() : m_pI(NULL) {}; |
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FORCEINLINE CAutoCopyPtrT(const Tdata& data) : m_pI(new CItem(data)) {}; |
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FORCEINLINE CAutoCopyPtrT(const CAutoCopyPtrT& src) : m_pI(src.m_pI) {if (m_pI != NULL) m_pI->m_ref_cnt++;} |
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FORCEINLINE ~CAutoCopyPtrT() {if (m_pI == NULL || (--m_pI->m_ref_cnt) > 0) return; delete m_pI; m_pI = NULL;} |
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/** data accessor (read only) */ |
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FORCEINLINE const Tdata& GetDataRO() const {if (m_pI == NULL) m_pI = new CItem(); return m_pI->m_data;} |
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/** data accessor (read / write) */ |
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FORCEINLINE Tdata& GetDataRW() {CloneIfShared(); if (m_pI == NULL) m_pI = new CItem(); return m_pI->m_data;} |
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/** clone data if it is shared */ |
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FORCEINLINE void CloneIfShared() |
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{ |
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if (m_pI != NULL && m_pI->m_ref_cnt > 1) { |
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// we share data item with somebody, clone it to become an exclusive owner |
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CItem* pNewI = new CItem(*m_pI); |
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m_pI->m_ref_cnt--; |
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m_pI = pNewI; |
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} |
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} |
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/** assign pointer from the other one (maintaining ref counts) */ |
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FORCEINLINE void Assign(const CAutoCopyPtrT& src) |
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{ |
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if (m_pI == src.m_pI) return; |
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if (m_pI != NULL && (--m_pI->m_ref_cnt) <= 0) delete m_pI; |
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m_pI = src.m_pI; |
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if (m_pI != NULL) m_pI->m_ref_cnt++; |
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} |
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/** dereference operator (read only) */ |
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FORCEINLINE const Tdata* operator -> () const {return &GetDataRO();} |
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/** dereference operator (read / write) */ |
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FORCEINLINE Tdata* operator -> () {return &GetDataRW();} |
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/** assignment operator */ |
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FORCEINLINE CAutoCopyPtrT& operator = (const CAutoCopyPtrT& src) {Assign(src); return *this;} |
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/** forwarding 'lower then' operator to the underlaying items */ |
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FORCEINLINE bool operator < (const CAutoCopyPtrT& other) const |
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{ |
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assert(m_pI != NULL); |
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assert(other.m_pI != NULL); |
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return (m_pI->m_data) < (other.m_pI->m_data); |
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} |
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}; |
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#endif /* 0 */ |
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#endif /* AUTOCOPYPTR_HPP */ |