“nullptr“ should be used to denote the null pointer

Before C++11, the only way to refer to a null pointer was by using the integer literal
 0, which created ambiguity with regard to whether a pointer or an integer was intended. Even with the
 NULL
 macro, the underlying value is still
 0.
C++11 introduced the keyword
 nullptr, which is unambiguous and should be used systematically.
Noncompliant Code Example

1. void f(char *c);
2. void g(int i);
3. void h()
4. {
5.     f(0); // Noncompliant
6.     f(NULL); // Noncompliant
7.     g(0); // Compliant, a real integer
8.     g(NULL); // Noncompliant, NULL should not be used for a real integer
9. }

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2.  

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Compliant Solution

1. void f(char *c);
2. void g(int i);
3. void h()
4. {
5.     f(nullptr); // Compliant
6.     g(0);  // Compliant, a real integer
7. }

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See

• C++ Core Guidelines ES.47
   - Use nullptr rather than 0 or NULL
  

For example

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