Although this may at first seem like only an efficiency concern ( and you normally don ' t want to concern yourself with efficiency tuning while you ' re designing and assembling your program ) , there ' s more at stake : as you ' ll see in the remainder of the chapter , a copy - constructor is required to pass an object by value , and this isn ' t always available 尽管初看起来，仅仅是一个与效率相关的难题（并且你在设计和装配程序时，一般不会想到通过调整效率来关心一下自己的程序） ，这更像是在赌博：本章余下的内容中你将会看到，通过传值方式需要给对象传递一个拷贝构造函数，但并不老是行得通。
When we had talk d a while , the captain told me , he had brought me some little refreshment , such as the ship afforded , and such as the wretches that had been so long his master had not plunder d him of : upon this he call d aloud to the boat , and bid his men bring the things ashore that were for the governour ; and indeed it was a present , as if i had been one not that was to be carry d away along with them , but as if i had been to dwell upon the island still , and they were to go without me 这些东西，只是暴徒们劫后残剩下来的，所以只能拿出这么一点了。说着，他向小船高声喊了一声，吩咐他手下人把献给总督的东西搬上岸来。这实际上是一份丰厚的礼物，初看起来，好像要让我在岛上继续呆下去，不准备把我载走了。
