is_null_ptr.h

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//
//
/*
    Copyright (C) 2000- 2013, Hammersmith Imanet Ltd
    Copyright (C) 2016, University College London
    This file is part of STIR.
 
    SPDX-License-Identifier: Apache-2.0
 
    See STIR/LICENSE.txt for details
*/
 
#ifndef __stir_is_null_ptr_H__
#define __stir_is_null_ptr_H__
 
#include "stir/shared_ptr.h"
#include <memory>
#include "stir/unique_ptr.h"
START_NAMESPACE_STIR
template <typename T>
inline bool
is_null_ptr(T const* const ptr)
{
#ifdef BOOST_NO_CXX11_NULLPTR
  return ptr == 0;
#else
  return ptr == nullptr;
#endif
}
 
template <typename T>
inline bool
is_null_ptr(shared_ptr<T> const& sptr)
{
  return is_null_ptr(sptr.get());
}
 
template <typename T>
inline bool
is_null_ptr(unique_ptr<T> const& aptr)
{
  return is_null_ptr(aptr.get());
}
 
#ifndef BOOST_NO_CXX11_NULLPTR
inline bool
is_null_ptr(const std::nullptr_t)
{
  return true;
}
#endif

 
END_NAMESPACE_STIR
 
#endif