问题描述
如何将某些元素从第一个向量移动到第二个向量，而这些元素将从第一个向量中删除?
如果我使用 std::move，则不会从第一个向量中删除元素.
这是我写的代码:
How can I move some elements from first vector to second, and the elements will remove from the first?
if I am using std::move, the elements not removed from first vector.
this is the code I wrote:
move(xSpaces1.begin() + 7, xSpaces1.end(), back_inserter(xSpaces2));
推荐答案
std::move 可让您移动对象，而不是复制它们，从而实现潜在更快的执行速度.当您移动一系列值时，节省可能更大.但是，当您从容器中移动范围时，该容器仍然保留曾经被这些值占据的地方.
The std::move lets you move the objects, as opposed to copying them, allowing for a potentially faster execution speed. The savings may be even greater when you move a range of values. However, when you do move a range from a container, the container still holds the places that were once occupied by these values.
如果您想删除这些占位符，您需要手动调整容器大小以删除它们(您不必这样做，以防您更愿意将这些容器点重用于其他元素).一种方法是调用 vector::erase 在您移出容器的同一范围内.
You need to resize the container manually to remove these placeholders if you want to get rid of them (you don't have to, in case you would prefer reusing these container spots for other elements). One way to do it is to call vector::erase on the same range that you moved out of the container.
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