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2.01.nullptr.cpp
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35 lines (30 loc) · 896 Bytes
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//
// 2.1.nullptr.cpp
// chapter 2 language usability
// modern cpp tutorial
//
// created by changkun at changkun.de
// https://github.com/changkun/modern-cpp-tutorial
//
#include <iostream>
#include <type_traits>
void foo(char *);
void foo(int);
int main() {
if (std::is_same<decltype(NULL), decltype(0)>::value)
std::cout << "NULL == 0" << std::endl;
if (std::is_same<decltype(NULL), decltype((void*)0)>::value)
std::cout << "NULL == (void *)0" << std::endl;
if (std::is_same<decltype(NULL), std::nullptr_t>::value)
std::cout << "NULL == nullptr" << std::endl;
foo(0); // will call foo(int)
// foo(NULL); // doesn't compile
foo(nullptr); // will call foo(char*)
return 0;
}
void foo(char *) {
std::cout << "foo(char*) is called" << std::endl;
}
void foo(int i) {
std::cout << "foo(int) is called" << std::endl;
}