如何删除重复字段中的任意对象？ （protobuf） [英] How to delete arbitrary objects in repeated field? (protobuf)

问题描述

我在proto的重复字段中有一些条目。现在我想删除其中一些。我该如何做到这一点？有一个函数来删除最后一个元素，但我想删除任意元素。我不能只交换它们，因为顺序很重要。

I have some entries in the repeated field in my proto. Now I want delete some of them. How can I accomplish this? There is a function to delete the last element, but I want to delete arbitrary elements. I cant just swap them because the order is important.

我可以交换下一个直到结束，但是没有更好的解决方案？

I could swap with next until end, but isn't there a nicer solution?

推荐答案

根据 API文档，没有办法从重复字段中任意删除元素，只是删除最后一个元素的方法。

According to the API docs, there isn't a way to arbitrarily remove an element from within a repeated field, just a way to remove the last one.

...

我们不提供删除最后
以外的任何元素的方法，因为它会导致无效的使用，例如作为O（n ^ 2）过滤循环
，应该已经是O（n）。如果你想删除一个元素其他
比最后一个，最好的方法是重新排列元素所以
，你想要删除的是在结束，然后调用RemoveLast（）

...

...
We don't provide a way to remove any element other than the last because it invites inefficient use, such as O(n^2) filtering loops that should have been O(n). If you want to remove an element other than the last, the best way to do it is to re-arrange the elements so that the one you want removed is at the end, then call RemoveLast()
...

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