10. Have assignment operators return a reference to *this

令operator = 返回一个reference to *this

int x, y, z;
x = y = z = 15;

这是“连锁赋值”。

对于自定义类，如果要满足连锁赋值，赋值操作符必须返回一个引用指向操作符的左侧实参。其他复合赋值操作符也一样。

class Widget
{public:...Widget& operator = (const Widget& rhs) // 赋值操作符{...return *this;}Widget& operator += (const Widget& rhs) // 复合赋值操作符{...return *this;}...
}

赋值操作符返回引用并无强制性，不返回引用编译器一样能够编译通过。
只是像STL中的string、vector、complex都遵循“赋值操作符、复合赋值操作符都返回引用”这一个规则，建议自定义类也遵循。

请注意：

令赋值(assignment)操作符返回一个 reference to *this。

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