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      std::nullptr_t

      De cppreference.com

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      <tbody> </tbody>
      Definido no cabeçalho <cstddef>
      typedef decltype(nullptr) nullptr_t;
      		 (desde C++11)
      std::nullptr_t é o tipo de ponteiro nulo literal, nullptr.
      Original:
      std::nullptr_t is the type of the null pointer literal, nullptr.
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      Exemplo

      Se dois ou mais sobrecargas aceitar tipos diferentes de ponteiro, uma sobrecarga para std::nullptr_t é necessário aceitar um argumento de ponteiro nulo .
      Original:
      If two or more overloads accept different pointer types, an overload for std::nullptr_t is necessary to accept a null pointer argument.
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      #include <cstddef>
#include <iostream>

void f(int* pi)
{
   std::cout << "Pointer to integer overload\n";
}

void f(double* pd)
{
   std::cout << "Pointer to double overload\n";
}

void f(std::nullptr_t nullp)
{
   std::cout << "null pointer overload\n";
}

int main()
{
    int* pi; double* pd;

    f(pi);
    f(pd);
    f(nullptr);  // would be ambiguous without void f(nullptr_t)
    // f(NULL);  // ambiguous overload: all three functions are candidates
}

      Saída: 

      Pointer to integer overload
Pointer to double overload
null pointer overload

      Veja também

      nullptr
      o ponteiro literal que especifica um valor nulo (C++11) ponteiro
      Original:
      the pointer literal which specifies a null pointer value (C++11)
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      [edit]
      definida pela implementação ponteiro nulo constante
      Original:
      implementation-defined null pointer constant
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      (macro constante) [edit]