CppNullptr.md

(C++) nullptr

nullptr is a C++11 keyword to indicate an unitialized pointer.

#include <cassert>

int main()
{
  //Create a new p
  int * p = new int(3);
  assert(*p == 3);

  //Get rid of the current p
  delete p;
  p = nullptr;

  //Create a new p
  p = new int(4);
  assert(*p == 4);
}

Advice

• Prefer nullptr to NULL and 0 [2,3]

References

• [1] GCC page about C++0x support
• [2] Scott Meyers. C++ And Beyond 2012 session: 'Initial thoughts on Effective C++11'. 2012. 'Prefer nullptr to NULL and 0'
• [3] Jason Turner, cppbestpractices: Use nullptr