在C ++中用括号初始化数组对象

这里有一个带有两个私有字段x和y的类；

class Point
{
private:
    int x, y;
public:
    Point(int = 1,int = 1);
    void move(int, int);
    void print()
    {
        cout << "X = " << x << ", Y = " << y << endl;
    }
};

当按如下所示初始化Point对象的数组时，输出正常；否则，输出为0。

Point array1[] = { (10), (20), { 30, 40 } };

输出;

First array
X = 10, Y = 1
X = 20, Y = 1
X = 30, Y = 40

但是，如果我们按如下所示初始化Point数组，则输出很奇怪；

Point array2[] = { (10), (20), (30, 40) }; 

输出;

Second array
X = 10, Y = 1
X = 20, Y = 1
X = 40, Y = 1

为什么（30,40）不能用于Point对象的初始化？

这是完整的测试代码；

#include <iostream>
using namespace std;

class Point
{
private:
    int x, y;
public:
    Point(int = 1,int = 1);
    void move(int, int);
    void print()
    {
        cout << "X = " << x << ", Y = " << y << endl;
    }
};

Point::Point(int x, int y)
{
    cout << "..::Two Parameter Constructor is invoked::..\n";
    this->x = x;
    this->y = y;
}

void Point::move(int x, int y)
{
    this->x = x;
    this->y = y;
}

int main()
{
    // Point array1[] = { Point(10), Point(20), Point(30, 40) };
    // Use parenthesis for object array initialization;
    Point array1[] = { (10), (20), { 30, 40 } };    // curly bracket used for two parameter
    Point array2[] = { (10), (20), (30, 40) };      // paranthesis used for all objects

    cout << "First array" << endl;
    for (int i = 0; i < 3; i++)
        array1[i].print();

    cout << "Second array" << endl;
    for (int i = 0; i < 3; i++)
        array2[i].print();

    return 0;
}

并完整输出测试代码；

..::Two Parameter Constructor is invoked::..
..::Two Parameter Constructor is invoked::..
..::Two Parameter Constructor is invoked::..
..::Two Parameter Constructor is invoked::..
..::Two Parameter Constructor is invoked::..
..::Two Parameter Constructor is invoked::..
First array
X = 10, Y = 1
X = 20, Y = 1
X = 30, Y = 40
Second array
X = 10, Y = 1
X = 20, Y = 1
X = 40, Y = 1