c++11 nullptr

c++11 nullptr

#define _CRT_SECURE_NO_WARNINGS

#include <iostream>
#include <string>
#include <vector>
#include <map>

void func(int a)
{
    std::cout << __LINE__ << " a= " << a << std::endl;
}

void func(int *p)
{
    std::cout << __LINE__ << " p= " << p << std::endl;
}

void mytest()
{
    int *p1 = nullptr;
    int *p2 = NULL;
    if (p1 == p2)
    {
        std::cout << "equal" << std::endl;
    }

    // int a = nullptr; // err, 编译失败，nullptr不能转型为int

    func(0); // 调用func(int)
    func(NULL); // 调用func(int)
    func(nullptr); // 调用func(int *p)

    return;
}

int main()
{
    mytest();

    system("pause");
    return 0;
}