/usr/include/dune/common/nullptr.hh is in libdune-common-dev 2.4.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_NULLPTR_HH
#define DUNE_NULLPTR_HH
/** \file
* \brief Fallback implementation of the nullptr object in C++0x
*/
#if ! HAVE_NULLPTR
/**
\brief Fallback implementation of nullptr
see C++ proposal
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2431.pdf
*/
const // this is a const object...
class dune_nullptr_t { // of type nullptr_t
public:
template<class T> // convertible to any type
operator T*() const // of null non-member
{ return 0; } // pointer...
template<class C, class T> // or any type of null
operator T C::*() const // member pointer...
{ return 0; }
private:
void operator&() const; // whose address can't be taken
} nullptr = {}; // and whose name is nullptr
namespace Dune {
typedef dune_nullptr_t nullptr_t;
}
template<class T>
bool operator == (T* t, dune_nullptr_t)
{
return (t == static_cast<T*>(nullptr));
}
template<class T>
bool operator == (dune_nullptr_t, T* t)
{
return (t == static_cast<T*>(nullptr));
}
#else
#include <cstddef>
namespace Dune {
using std::nullptr_t;
}
#endif // HAVE_NULLPTR
#endif // DUNE_NULLPTR_HH
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