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# smartptr.h

    00001 #ifndef CRYPTOPP_SMARTPTR_H
    00002 #define CRYPTOPP_SMARTPTR_H
    00003
    00004 #include "config.h"
    00005 #include <algorithm>
    00006
    00007 NAMESPACE_BEGIN(CryptoPP)
    00008
    00009 template <class T> class simple_ptr
    00010 {
    00011 public:
    00012         simple_ptr() : m_p(NULL) {}
    00013         ~simple_ptr() {delete m_p;}
    00014         T *m_p;
    00015 };
    00016
    00017 template <class T> class member_ptr
    00018 {
    00019 public:
    00020         explicit member_ptr(T *p = NULL) : m_p(p) {}
    00021
    00022         ~member_ptr();
    00023
    00024         const T& operator*() const { return *m_p; }
    00025         T& operator*() { return *m_p; }
    00026
    00027         const T* operator->() const { return m_p; }
    00028         T* operator->() { return m_p; }
    00029
    00030         const T* get() const { return m_p; }
    00031         T* get() { return m_p; }
    00032
    00033         T* release()
    00034         {
    00035                 T *old_p = m_p;
    00036                 m_p = 0;
    00037                 return old_p;
    00038         }
    00039
    00040         void reset(T *p = 0);
    00041
    00042 protected:
    00043         member_ptr(const member_ptr<T>& rhs);           // copy not allowed
    00044         void operator=(const member_ptr<T>& rhs);       // assignment not allowed
    00045
    00046         T *m_p;
    00047 };
    00048
    00049 template <class T> member_ptr<T>::~member_ptr() {delete m_p;}
    00050 template <class T> void member_ptr<T>::reset(T *p) {delete m_p; m_p = p;}
    00051
    00052 // ********************************************************
    00053
    00054 template<class T> class value_ptr : public member_ptr<T>
    00055 {
    00056 public:
    00057         value_ptr(const T &obj) : member_ptr<T>(new T(obj)) {}
    00058         value_ptr(T *p = NULL) : member_ptr<T>(p) {}
    00059         value_ptr(const value_ptr<T>& rhs)
    00060                 : member_ptr<T>(rhs.m_p ? new T(*rhs.m_p) : NULL) {}
    00061
    00062         value_ptr<T>& operator=(const value_ptr<T>& rhs);
    00063         bool operator==(const value_ptr<T>& rhs)
    00064         {
    00065                 return (!this->m_p && !rhs.m_p) || (this->m_p && rhs.m_p && *this->m_p == *rhs.m_p);
    00066         }
    00067 };
    00068
    00069 template <class T> value_ptr<T>& value_ptr<T>::operator=(const value_ptr<T>& rhs)
    00070 {
    00071         T *old_p = this->m_p;
    00072         this->m_p = rhs.m_p ? new T(*rhs.m_p) : NULL;
    00073         delete old_p;
    00074         return *this;
    00075 }
    00076
    00077 // ********************************************************
    00078
    00079 template<class T> class clonable_ptr : public member_ptr<T>
    00080 {
    00081 public:
    00082         clonable_ptr(const T &obj) : member_ptr<T>(obj.Clone()) {}
    00083         clonable_ptr(T *p = NULL) : member_ptr<T>(p) {}
    00084         clonable_ptr(const clonable_ptr<T>& rhs)
    00085                 : member_ptr<T>(rhs.m_p ? rhs.m_p->Clone() : NULL) {}
    00086
    00087         clonable_ptr<T>& operator=(const clonable_ptr<T>& rhs);
    00088 };
    00089
    00090 template <class T> clonable_ptr<T>& clonable_ptr<T>::operator=(const clonable_ptr<T>& rhs)
    00091 {
    00092         T *old_p = this->m_p;
    00093         this->m_p = rhs.m_p ? rhs.m_p->Clone() : NULL;
    00094         delete old_p;
    00095         return *this;
    00096 }
    00097
    00098 // ********************************************************
    00099
    00100 template<class T> class counted_ptr
    00101 {
    00102 public:
    00103         explicit counted_ptr(T *p = 0);
    00104         counted_ptr(const T &r) : m_p(0) {attach(r);}
    00105         counted_ptr(const counted_ptr<T>& rhs);
    00106
    00107         ~counted_ptr();
    00108
    00109         const T& operator*() const { return *m_p; }
    00110         T& operator*() { return *m_p; }
    00111
    00112         const T* operator->() const { return m_p; }
    00113         T* operator->() { return get(); }
    00114
    00115         const T* get() const { return m_p; }
    00116         T* get();
    00117
    00118         void attach(const T &p);
    00119
    00120         counted_ptr<T> & operator=(const counted_ptr<T>& rhs);
    00121
    00122 private:
    00123         T *m_p;
    00124 };
    00125
    00126 template <class T> counted_ptr<T>::counted_ptr(T *p)
    00127         : m_p(p)
    00128 {
    00129         if (m_p)
    00130                 m_p->m_referenceCount = 1;
    00131 }
    00132
    00133 template <class T> counted_ptr<T>::counted_ptr(const counted_ptr<T>& rhs)
    00134         : m_p(rhs.m_p)
    00135 {
    00136         if (m_p)
    00137                 m_p->m_referenceCount++;
    00138 }
    00139
    00140 template <class T> counted_ptr<T>::~counted_ptr()
    00141 {
    00142         if (m_p && --m_p->m_referenceCount == 0)
    00143                 delete m_p;
    00144 }
    00145
    00146 template <class T> void counted_ptr<T>::attach(const T &r)
    00147 {
    00148         if (m_p && --m_p->m_referenceCount == 0)
    00149                 delete m_p;
    00150         if (r.m_referenceCount == 0)
    00151         {
    00152                 m_p = r.clone();
    00153                 m_p->m_referenceCount = 1;
    00154         }
    00155         else
    00156         {
    00157                 m_p = const_cast<T *>(&r);
    00158                 m_p->m_referenceCount++;
    00159         }
    00160 }
    00161
    00162 template <class T> T* counted_ptr<T>::get()
    00163 {
    00164         if (m_p && m_p->m_referenceCount > 1)
    00165         {
    00166                 T *temp = m_p->clone();
    00167                 m_p->m_referenceCount--;
    00168                 m_p = temp;
    00169                 m_p->m_referenceCount = 1;
    00170         }
    00171         return m_p;
    00172 }
    00173
    00174 template <class T> counted_ptr<T> & counted_ptr<T>::operator=(const counted_ptr<T>& rhs)
    00175 {
    00176         if (m_p != rhs.m_p)
    00177         {
    00178                 if (m_p && --m_p->m_referenceCount == 0)
    00179                         delete m_p;
    00180                 m_p = rhs.m_p;
    00181                 if (m_p)
    00182                         m_p->m_referenceCount++;
    00183         }
    00184         return *this;
    00185 }
    00186
    00187 // ********************************************************
    00188
    00189 template <class T> class vector_member_ptrs
    00190 {
    00191 public:
    00192         vector_member_ptrs(unsigned int size=0)
    00193                 : m_size(size), m_ptr(new member_ptr<T>[size]) {}
    00194         ~vector_member_ptrs()
    00195                 {delete [] this->m_ptr;}
    00196
    00197         member_ptr<T>& operator[](unsigned int index)
    00198                 {assert(index<this->m_size); return this->m_ptr[index];}
    00199         const member_ptr<T>& operator[](unsigned int index) const
    00200                 {assert(index<this->m_size); return this->m_ptr[index];}
    00201
    00202         unsigned int size() const {return this->m_size;}
    00203         void resize(unsigned int newSize)
    00204         {
    00205                 member_ptr<T> *newPtr = new member_ptr<T>[newSize];
    00206                 for (unsigned int i=0; i<this->m_size && i<newSize; i++)
    00207                         newPtr[i].reset(this->m_ptr[i].release());
    00208                 delete [] this->m_ptr;
    00209                 this->m_size = newSize;
    00210                 this->m_ptr = newPtr;
    00211         }
    00212
    00213 private:
    00214         vector_member_ptrs(const vector_member_ptrs<T> &c);     // copy not allowed
    00215         void operator=(const vector_member_ptrs<T> &x);         // assignment not allowed
    00216
    00217         unsigned int m_size;
    00218         member_ptr<T> *m_ptr;
    00219 };
    00220
    00221 NAMESPACE_END
    00222
    00223 #endif