TPointer.h

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#pragma once
 
namespace sf
{
 
template<typename T>
class TPointerBase
{
    static_assert(!std::is_pointer_v<T>, "Type T must be a non-pointer type.");
 
  public:
    T& operator*()
    {
      return *P;
    }
 
    // ReSharper disable once CppNonExplicitConversionOperator
    operator T*()
    {
      return P;
    }
 
    int operator!() const
    {
      return P == nullptr;
    }
 
    T* Relinquish()
    {
      T* p = P;
      P = 0;
      return p;
    }
 
  protected:
    explicit TPointerBase(T* pointer)
      : P(pointer)
    {}
 
    TPointerBase()
      : P(nullptr)
    {}
 
    T* P;
 
  private:
    // Prohibit use of new
    void* operator new(size_t) noexcept
    {
      return nullptr;
    }
 
    // Delete only sets pointer to null.
    void operator delete(void* p)
    {
      static_cast<TPointerBase<T>*>(p)->P = nullptr;
    }
};
 
template<typename T>
class TPointer : public TPointerBase<T>
{
  private:
    typedef TPointerBase<T> TBase;
 
  public:
    TPointer()
      : TBase()
    {}
 
    explicit TPointer(T* pointer)
      : TBase(pointer)
    {}
 
    ~TPointer()
    {
      delete TBase::P;
    }
 
    TPointer& operator=(T* src)
    {
      delete TBase::P;
      TBase::P = src;
      return *this;
    }
 
    // Could throw exception if P==0
    T* operator->()
    {
      return TBase::P;
    }
};
 
template<typename T>
class TAPointer : public TPointerBase<T>
{
  private:
    typedef TPointerBase<T> TBase;
 
  public:
    TAPointer()
      : TBase()
    {}
 
    explicit TAPointer(T array[])
      : TBase(array)
    {}
 
    ~TAPointer()
    {
      delete[] TBase::P;
    }
 
    TAPointer<T>& operator=(T src[])
    {
      delete[] TBase::P;
      TBase::P = src;
      return *this;
    }
 
    T& operator[](int i)
    {
      // Could throw exception if P==0
      return TBase::P[i];
    }
};
 
}// namespace sf