scoped_pointer.h

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// g2o - General Graph Optimization
// Copyright (C) 2011 R. Kuemmerle
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
//   notice, this list of conditions and the following disclaimer in the
//   documentation and/or other materials provided with the distribution.
//
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#ifndef G2O_SCOPED_POINTER_H
#define G2O_SCOPED_POINTER_H

#include <cassert>

namespace g2o {

  namespace {
    struct ScopedPointerDeleter
    {
      template<typename T>
      void operator()(T* t) { delete t;}
    };
  }

  template <typename T, typename Del = ScopedPointerDeleter>
  class ScopedPointer 
  {
    public:
      ScopedPointer(T* t = 0) : _pointer(t) {}

      ~ScopedPointer()
      {
        Del deleter;
        deleter(_pointer);
      }

      T& operator*() const { return *_pointer;}
      T* operator->() const { return _pointer;}
      T* get() const { return _pointer;}

      void reset(T* p)
      {
        assert((p == 0 || p != _pointer) && "ScopedPointer should not reset with itself");
        ScopedPointer aux(p);
        swap(aux);
      }

      void swap(ScopedPointer& b)
      {
        T* aux = b._pointer;
        b._pointer = _pointer;
        _pointer = aux;
      }

    protected:
      T* _pointer;

      // do not allow to copy the object
    private:
      ScopedPointer(const ScopedPointer&);
      const ScopedPointer& operator=(const ScopedPointer&);
  };

  template <typename T>
  class ScopedArray
  {
    public:
      ScopedArray(T* t = 0) : _pointer(t) {}

      ~ScopedArray()
      {
        delete[] _pointer;
      }

      T & operator[](std::ptrdiff_t i) const
      {
        assert(_pointer != 0 && i >= 0);
        return _pointer[i];
      }

      T* get() const { return _pointer;}

      void reset(T* p)
      {
        assert((p == 0 || p != _pointer) && "ScopedPointer should not reset with itself");
        ScopedArray aux(p);
        swap(aux);
      }

      void swap(ScopedArray & b)
      {
        T* aux = b._pointer;
        b._pointer = _pointer;
        _pointer = aux;
      }

    protected:
      T* _pointer;

      // do not allow to copy the object
    private:
      ScopedArray(const ScopedArray&);
      const ScopedArray& operator=(const ScopedArray&);
  };

} // end namespace

#endif