c – copy_backward和reverse_copy之间的区别？

我正在阅读C primer并看到这两个似乎具有相同功能的函数.谁能帮忙告诉我两者有什么区别？谢谢.

解决方法

reverse_copy实际上以相反的顺序放置元素.

1 2 3 4 5 - > 5 4 3 2 1

copy_backward只是向后复制元素,但保留它们的相对顺序.

1 2 3 4 5

首先复制5,但放在最后一个位置.所以你的输出仍然是：

1 2 3 4 5

http://en.cppreference.com/w/cpp/algorithm/copy_backward

copies the elements from the range,defined by [first,last),to another range ending at d_last. The elements are copied in reverse order (the last element is copied first),but their relative order is preserved.

http://en.cppreference.com/w/cpp/algorithm/reverse_copy

copies the elements from the range [first,last) to another range beginning at d_first in such a way that the elements in the new range are in reverse order.