pointer.h

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#pragma once
#include <utility>
 
namespace sf
{
 
template<typename T>
inline void delete_null(T& p)
{
  if (p)
  {
    delete p;
    p = nullptr;
  }
}
 
template<typename T>
inline void delete_anull(T& p)
{
  if (p)
  {
    delete[] p;
    p = nullptr;
  }
}
 
template<typename T>
inline void free_null(T& p)
{
  if (p)
  {
    free(p);
    p = nullptr;
  }
}
 
template<typename T>
[[deprecated]] inline void swap_it(T& t1, T& t2)
{
  std::swap(t1, t2);
}
 
template<typename T>
class scope_delete
{
  public:
    explicit scope_delete(T* p)
    {
      P = p;
    }
 
    ~scope_delete()
    {
      delete_null(P);
    }
 
    inline void disable_delete()
    {
      P = nullptr;
    }
 
  private:
    T* P;
};
 
template<typename T>
class scope_free
{
  public:
    explicit scope_free(T* p)
    {
      P = p;
    }
 
    ~scope_free()
    {
      free_null(P);
    }
 
    inline void disable_free()
    {
      P = nullptr;
    }
 
  private:
    T* P;
};
 
template<typename T>
inline T& null_ref()
{
  return (*(static_cast<T*>(nullptr)));
}
 
template<typename T>
inline bool not_ref_null(T& r)
{
  return &r == nullptr;
}
 
}// namespace sf