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#ifndef SHARED_PTR_H
#define SHARED_PTR_H
/* TODO includes */
#undef SOLVED_1
#define SOLVED_1
/* TODO: remove */
#define SHPDEBUG if (0)
#include <iostream>
namespace Ti
{
/* TODO helpers */
template <typename T>
class shared_ptr
{
private:
T* m_ptr;
unsigned long* m_count;
public:
shared_ptr()
: m_ptr(NULL), m_count(NULL)
{
SHPDEBUG std::cerr << this << ": shared_ptr()" << std::endl;
}
T* get() const
{
SHPDEBUG std::cerr << this << ": get()" << std::endl;
return m_ptr;
}
shared_ptr(const shared_ptr<T>& other)
: m_ptr(other.m_ptr), m_count(other.m_count)
{
SHPDEBUG std::cerr << this << ": shared_ptr(shared_ptr<T>& other)" << std::endl;
add_ref();
}
template <typename O>
shared_ptr(const shared_ptr<O>& other)
: m_ptr(other.m_ptr), m_count(other.m_count)
{
SHPDEBUG std::cerr << this << ": shared_ptr(shared_ptr<O>& other)" << std::endl;
add_ref();
}
/* used to construct shared_ptr with a sub-object of O */
template <typename O>
shared_ptr(const shared_ptr<O>& other, T* ptr)
: m_ptr(ptr), m_count(other.m_count)
{
SHPDEBUG std::cerr << this << ": shared_ptr(shared_ptr<O>& other, O* ptr)" << std::endl;
add_ref();
}
template <typename O>
explicit shared_ptr(O* p)
: m_ptr(p), m_count(new unsigned long(1))
{
SHPDEBUG std::cerr << this << ": shared_ptr(O* p)" << std::endl;
}
shared_ptr& operator=(const shared_ptr<T>& other)
{
SHPDEBUG std::cerr << this << ": operator=(shared_ptr<T>& other)" << std::endl;
#if 1
shared_ptr(other).swap(*this);
return *this;
#else
if (*this == other)
return *this;
release();
m_ptr = other.m_ptr;
m_count = other.m_count;
add_ref();
return *this;
#endif
}
template <typename O>
shared_ptr& operator=(const shared_ptr<O>& other)
{
SHPDEBUG std::cerr << this << ": operator=(shared_ptr<O>& other)" << std::endl;
#if 0
shared_ptr(other).swap(*this);
return *this;
#else
if (*this == other)
return *this;
release();
m_ptr = other.m_ptr;
m_count = other.m_count;
add_ref();
return *this;
#endif
}
~shared_ptr()
{
SHPDEBUG std::cerr << this << ": ~shared_ptr()" << std::endl;
release();
}
T& operator*() const
{
return *m_ptr;
}
T* operator->() const
{
return m_ptr;
}
void swap(shared_ptr<T>& other)
{
/* std::swap(m_ptr, other.m_ptr); */
T* ptr(m_ptr);
m_ptr = other.m_ptr;
other.m_ptr = ptr;
/* std::swap(m_count, other.m_count); */
unsigned long* count(m_count);
m_count = other.m_count;
other.m_count = count;
}
inline void reset()
{
shared_ptr().swap(*this);
}
private:
void add_ref()
{
if (m_count != NULL)
++(*m_count);
}
void release()
{
if (m_ptr != NULL)
{
--(*m_count);
if (*m_count == 0)
{
delete m_ptr;
delete m_count;
}
}
}
template<class O> friend class shared_ptr;
template <typename R, typename... Args>
friend shared_ptr<R> make_shared(Args...);
template<typename U1, typename U2>
friend bool operator==(const shared_ptr<U1>& a, const shared_ptr<U2>& b);
template<typename U1, typename U2>
friend bool operator==(const shared_ptr<U1>& a, const U2* b);
template<typename U1, typename U2>
friend bool operator==(const U1* a, const shared_ptr<U2>& b);
template<typename U1, typename U2>
friend bool operator!=(const shared_ptr<U1>& a, const U2* b);
template<typename U1, typename U2>
friend bool operator!=(const U1* a, const shared_ptr<U2>& b);
template<typename U1, typename U2>
friend bool operator!=(const shared_ptr<U1>& a, const shared_ptr<U2>& b);
template <typename R, typename F>
friend shared_ptr<R> shared_dynamic_cast(const shared_ptr<F>& from);
};
template <typename T, typename ... Args>
shared_ptr<T> make_shared(Args ... args)
{
SHPDEBUG std::cerr << "make_shared(args...)" << std::endl;
return shared_ptr<T>(new T(args ...));
}
template<typename U1, typename U2>
bool operator==(const shared_ptr<U1>& a, const shared_ptr<U2>& b)
{
return a.get() == b.get();
}
template<typename U1, typename U2>
bool operator==(const shared_ptr<U1>& a, const U2* b)
{
return a.get() == b.get();
}
template<typename U1, typename U2>
bool operator==(const U1* a, const shared_ptr<U2>& b)
{
return a.get() == b.get();
}
template<typename U1, typename U2>
bool operator!=(const shared_ptr<U1>& a, const U2* b)
{
return a.get() != b.get();
}
template<typename U1, typename U2>
bool operator!=(const U1* a, const shared_ptr<U2>& b)
{
return a.get() != b.get();
}
template<typename U1, typename U2>
bool operator!=(const shared_ptr<U1>& a, const shared_ptr<U2>& b)
{
return a.get() != b.get();
}
template <typename T, typename F>
shared_ptr<T> shared_dynamic_cast(const shared_ptr<F>& from)
{
SHPDEBUG std::cerr << "shared_dynamic_cast(...)" << std::endl;
T* castptr = dynamic_cast<T *>(from.get());
if (castptr != NULL)
{
return shared_ptr<T>(from, castptr);
}
else
return shared_ptr<T>();
}
} // end namespace ti
namespace std
{
using namespace Ti;
template <typename T>
inline void swap(shared_ptr<T>& t1, shared_ptr<T>& t2)
{
t1.swap(t2);
}
/* TODO */
}
#endif
/* vim: set et sw=2 ts=2: */
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