std::nullptr_t, C++ (vc++)

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//Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x86

#include <iostream>

void foo( const int* ) { std::cout << "const int*\n" ; }
void foo( const void* ) { std::cout << "const void*\n" ; }
void foo( std::nullptr_t ) { std::cout << "std::nullptr_t\n" ; }

int main()
{
    int i = 0 ;
    foo( std::addressof(i) ) ; // const int*
    int* pi = nullptr ; // type of pi is int*
    foo(pi) ; // const int*

double d = 0 ;
    foo( std::addressof(d) ) ; // const void*
    double* pd = nullptr ; // type of pd is double*
    foo(pd) ; // const void*

foo(nullptr) ; // std::nullptr_t (type of nullptr is std::nullptr_t )

const auto np1 = nullptr ; // type of np1 is std::nullptr_t
    foo(np1) ; // std::nullptr_t

std::nullptr_t np2 = 0 ; // type of np2 is std::nullptr_t
    foo(np2) ; // std::nullptr_t

// foo(0) ; // *** error: ambiguous: 1. foo( (const int*)0 ) ;
    //                                   2. foo( (const void*)0 ) ;
    //                                   3. foo( std::nullptr_t(0) ) ;
}

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Compilation time: 1,65 sec, absolute running time: 0,22 sec, absolute service time: 1,88 sec