#pragma once
#ifndef TCG_PTR_WRAPPER
#define TCG_PTR_WRAPPER
// STD includes
#include <iterator>
namespace tcg
{
/*!
\brief The ptr_wrapper class implements the basic functions necessary
to wrap a generic pointer object. The use case for this class
is to allow pointer inheritance.
*/
template <typename T>
class ptr
{
public:
typedef T *ptr_type;
typedef typename std::iterator_traits<ptr_type>::iterator_category iterator_category;
typedef typename std::iterator_traits<ptr_type>::value_type value_type;
typedef typename std::iterator_traits<ptr_type>::difference_type difference_type;
typedef typename std::iterator_traits<ptr_type>::pointer pointer;
typedef typename std::iterator_traits<ptr_type>::reference reference;
public:
explicit ptr(ptr_type p = ptr_type()) : m_ptr(p) {}
operator bool() const { return m_ptr; } // There should be no need to use
// the Safe Bool idiom
bool operator==(const ptr &other) const { return (m_ptr == other.m_ptr); }
bool operator!=(const ptr &other) const { return (m_ptr != other.m_ptr); }
bool operator<(const ptr &other) const { return (m_ptr < other.m_ptr); }
bool operator>(const ptr &other) const { return (m_ptr > other.m_ptr); }
bool operator<=(const ptr &other) const { return (m_ptr <= other.m_ptr); }
bool operator>=(const ptr &other) const { return (m_ptr >= other.m_ptr); }
ptr &operator++()
{
++m_ptr;
return *this;
}
ptr operator++(int) { return ptr(m_ptr++, *this); }
ptr &operator--()
{
--m_ptr;
return *this;
}
ptr operator--(int) { return ptr(m_ptr--, *this); }
ptr operator+(difference_type d) const { return ptr(m_ptr + d, *this); }
ptr &operator+=(difference_type d)
{
m_ptr += d;
return *this;
}
ptr operator-(difference_type d) const { return ptr(m_ptr - d, *this); }
ptr &operator-=(difference_type d)
{
m_ptr -= d;
return *this;
}
difference_type operator-(const ptr &other) const { return m_ptr - other.m_ptr; }
pointer operator->() const { return m_ptr; }
reference operator*() const { return *m_ptr; }
reference operator[](difference_type d) const { return m_ptr[d]; }
protected:
ptr_type m_ptr;
};
//=======================================================
template <typename T>
ptr<T> make_ptr(T *p) { return ptr<T>(p); }
} // namespace tcg
#endif // TCG_PTR_WRAPPER