C++初始值设定项列表重载消除歧义

class MyClass {
public:
    int x;
    int y;

    MyClass(int a) : x(a), y(0) {}
    MyClass(int a, int b) : x(a), y(b) {}
};

#include <iostream>

class MyClass {
public:
    int x;
    int y;

    MyClass(int a) : x(a), y(0) {}
    MyClass(int a, int b) : x(a), y(b) {}
};

int main() {
    // 显式调用构造函数
    MyClass obj1 = MyClass(1);

    // 使用默认参数
    MyClass obj2(1, 2);

    std::cout << "obj1: x = " << obj1.x << ", y = " << obj1.y << std::endl;
    std::cout << "obj2: x = " << obj2.x << ", y = " << obj2.y << std::endl;

    return 0;
}