Sets a timeout value for the specified operation.
为指定的操作设置超时值。
Type-safe means that the macro verifies that the specified operation can be performed on the given type before attempting to cast.
类型安全意味着宏在进行类型转换之前，会验证指定操作可以在指定类型上安全地执行。
The purpose of this method is to store the currently displayed number into the accumulator, to store the specified operation as well, and to reset the display for input of the next operand.
此方法的目的就是：将目前所显示的数值存储到此累加器、存储特定的操作以及为了下一个操作数的输入而重置显示。
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