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cryptopp/smartptr.h

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+#ifndef CRYPTOPP_SMARTPTR_H
+#define CRYPTOPP_SMARTPTR_H
+
+#include "config.h"
+#include <algorithm>
+
+NAMESPACE_BEGIN(CryptoPP)
+
+template <class T> class simple_ptr
+{
+public:
+	simple_ptr() : m_p(NULL) {}
+	~simple_ptr() {delete m_p;}
+	T *m_p;
+};
+
+template <class T> class member_ptr
+{
+public:
+	explicit member_ptr(T *p = NULL) : m_p(p) {}
+
+	~member_ptr();
+
+	const T& operator*() const { return *m_p; }
+	T& operator*() { return *m_p; }
+
+	const T* operator->() const { return m_p; }
+	T* operator->() { return m_p; }
+
+	const T* get() const { return m_p; }
+	T* get() { return m_p; }
+
+	T* release()
+	{
+		T *old_p = m_p;
+		m_p = 0;
+		return old_p;
+	} 
+
+	void reset(T *p = 0);
+
+protected:
+	member_ptr(const member_ptr<T>& rhs);		// copy not allowed
+	void operator=(const member_ptr<T>& rhs);	// assignment not allowed
+
+	T *m_p;
+};
+
+template <class T> member_ptr<T>::~member_ptr() {delete m_p;}
+template <class T> void member_ptr<T>::reset(T *p) {delete m_p; m_p = p;}
+
+// ********************************************************
+
+template<class T> class value_ptr : public member_ptr<T>
+{
+public:
+	value_ptr(const T &obj) : member_ptr<T>(new T(obj)) {}
+	value_ptr(T *p = NULL) : member_ptr<T>(p) {}
+	value_ptr(const value_ptr<T>& rhs)
+		: member_ptr<T>(rhs.m_p ? new T(*rhs.m_p) : NULL) {}
+
+	value_ptr<T>& operator=(const value_ptr<T>& rhs);
+	bool operator==(const value_ptr<T>& rhs)
+	{
+		return (!this->m_p && !rhs.m_p) || (this->m_p && rhs.m_p && *this->m_p == *rhs.m_p);
+	}
+};
+
+template <class T> value_ptr<T>& value_ptr<T>::operator=(const value_ptr<T>& rhs)
+{
+	T *old_p = this->m_p;
+	this->m_p = rhs.m_p ? new T(*rhs.m_p) : NULL;
+	delete old_p;
+	return *this;
+}
+
+// ********************************************************
+
+template<class T> class clonable_ptr : public member_ptr<T>
+{
+public:
+	clonable_ptr(const T &obj) : member_ptr<T>(obj.Clone()) {}
+	clonable_ptr(T *p = NULL) : member_ptr<T>(p) {}
+	clonable_ptr(const clonable_ptr<T>& rhs)
+		: member_ptr<T>(rhs.m_p ? rhs.m_p->Clone() : NULL) {}
+
+	clonable_ptr<T>& operator=(const clonable_ptr<T>& rhs);
+};
+
+template <class T> clonable_ptr<T>& clonable_ptr<T>::operator=(const clonable_ptr<T>& rhs)
+{
+	T *old_p = this->m_p;
+	this->m_p = rhs.m_p ? rhs.m_p->Clone() : NULL;
+	delete old_p;
+	return *this;
+}
+
+// ********************************************************
+
+template<class T> class counted_ptr
+{
+public:
+	explicit counted_ptr(T *p = 0);
+	counted_ptr(const T &r) : m_p(0) {attach(r);}
+	counted_ptr(const counted_ptr<T>& rhs);
+
+	~counted_ptr();
+
+	const T& operator*() const { return *m_p; }
+	T& operator*() { return *m_p; }
+
+	const T* operator->() const { return m_p; }
+	T* operator->() { return get(); }
+
+	const T* get() const { return m_p; }
+	T* get();
+
+	void attach(const T &p);
+
+	counted_ptr<T> & operator=(const counted_ptr<T>& rhs);
+
+private:
+	T *m_p;
+};
+
+template <class T> counted_ptr<T>::counted_ptr(T *p)
+	: m_p(p) 
+{
+	if (m_p)
+		m_p->m_referenceCount = 1;
+}
+
+template <class T> counted_ptr<T>::counted_ptr(const counted_ptr<T>& rhs)
+	: m_p(rhs.m_p)
+{
+	if (m_p)
+		m_p->m_referenceCount++;
+}
+
+template <class T> counted_ptr<T>::~counted_ptr()
+{
+	if (m_p && --m_p->m_referenceCount == 0)
+		delete m_p;
+}
+
+template <class T> void counted_ptr<T>::attach(const T &r)
+{
+	if (m_p && --m_p->m_referenceCount == 0)
+		delete m_p;
+	if (r.m_referenceCount == 0)
+	{
+		m_p = r.clone();
+		m_p->m_referenceCount = 1;
+	}
+	else
+	{
+		m_p = const_cast<T *>(&r);
+		m_p->m_referenceCount++;
+	}
+}
+
+template <class T> T* counted_ptr<T>::get()
+{
+	if (m_p && m_p->m_referenceCount > 1)
+	{
+		T *temp = m_p->clone();
+		m_p->m_referenceCount--;
+		m_p = temp;
+		m_p->m_referenceCount = 1;
+	}
+	return m_p;
+}
+
+template <class T> counted_ptr<T> & counted_ptr<T>::operator=(const counted_ptr<T>& rhs)
+{
+	if (m_p != rhs.m_p)
+	{
+		if (m_p && --m_p->m_referenceCount == 0)
+			delete m_p;
+		m_p = rhs.m_p;
+		if (m_p)
+			m_p->m_referenceCount++;
+	}
+	return *this;
+}
+
+// ********************************************************
+
+template <class T> class vector_member_ptrs
+{
+public:
+	vector_member_ptrs(size_t size=0)
+		: m_size(size), m_ptr(new member_ptr<T>[size]) {}
+	~vector_member_ptrs()
+		{delete [] this->m_ptr;}
+
+	member_ptr<T>& operator[](size_t index)
+		{assert(index<this->m_size); return this->m_ptr[index];}
+	const member_ptr<T>& operator[](size_t index) const
+		{assert(index<this->m_size); return this->m_ptr[index];}
+
+	size_t size() const {return this->m_size;}
+	void resize(size_t newSize)
+	{
+		member_ptr<T> *newPtr = new member_ptr<T>[newSize];
+		for (size_t i=0; i<this->m_size && i<newSize; i++)
+			newPtr[i].reset(this->m_ptr[i].release());
+		delete [] this->m_ptr;
+		this->m_size = newSize;
+		this->m_ptr = newPtr;
+	}
+
+private:
+	vector_member_ptrs(const vector_member_ptrs<T> &c);	// copy not allowed
+	void operator=(const vector_member_ptrs<T> &x);		// assignment not allowed
+
+	size_t m_size;
+	member_ptr<T> *m_ptr;
+};
+
+NAMESPACE_END
+
+#endif