从std :: vector中删除前N个元素 [英] Remove first N elements from a std::vector

问题描述

我似乎没有想到一个可靠的方法（也压缩内存）从std :: vector中删除前N个元素。

I can't seem to think of a reliable way (that also compacts memory) to remove the first N elements from a std::vector. How would one go about doing that?

推荐答案

由于你提到要压缩内存，所以最好复制一切到一个新的向量并使用交换惯例。

Since you mention that you want to compact memory, it would be best to copy everything to a new vector and use the swap idiom.

std::vector<decltype(myvector)::value_type>(myvector.begin()+N, myvector.end()).swap(myvector);

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