In the overloaded context they lose the guarantee that the left operand is evaluated before the second and that there is a sequence point inbetween.
因为在重载的上下文中，他们失去了左操作数的赋值在第二个之前的保证，而且之间也会有顺序点。
If the second operand is a Point, the method should return a new Point whose x coordinate is the sum of the x coordinates of the operands, and likewise for they coordinates.
如果第二个运算数是一个Point，该方法就应该返回一个新的Point，新点的横纵坐标分别为两个点坐标相加。
The side effect of updating the stored value of the operand shall occur between the previous and the next sequence point.
而这种“自增”的副作用会在上一个“序列点”跟下一个“序列点”之间完成。
The side effect of updating the stored value of the operand shall occur between the previous and the next sequence point.
而这种“自增”的副作用会在上一个“序列点”跟下一个“序列点”之间完成。
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