缩小向量

2021-12-21 00:00:00 vector c++ stl

我的地形引擎有问题(使用 DirectX).

I've got a problem with my terrain engine (using DirectX).

我使用向量来保存细节块的顶点.当块的细节增加时,向量也会增加.

I'm using a vector to hold the vertices of a detail block. When the block increases in detail, so the vector does.

但是,当块减少其细节时,向量的大小不会缩小.

BUT, when the block decreases its detail, the vector doesn't shrink in size.

那么,我的问题是:有没有办法缩小向量的大小?我确实尝试过:

So, my question: is there a way to shrink the size of a vector? I did try this:

vertexvector.reserve(16);

推荐答案

通常的技巧是用空向量交换:

The usual trick is to swap with an empty vector:

vector<vertex>(vertexvector.begin(), vertexvector.end()).swap(vertexvector);

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