代码如下
#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 = 0; double* pd = 0;
f(pi);
f(pd);
f(nullptr); // would be ambiguous without void f(nullptr_t)
// f(NULL); // ambiguous overload: all three functions are candidates
}
//Environment: Visual C++ 6.0 with modified STLPort
//Success
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