C ++:固定但运行时定义的长度数组的向量 [英] C++: Vector of fixed but runtime defined length arrays

问题描述

我知道我可以使用

std :: vector&std :: array< int，20>>myVec;

作为可在单个维度上生长的矩阵的容器.但是，必须在编译时定义 std:array<> 的大小.有什么简单的方法可以对运行时定义的数组执行相同的操作?

as a container for a matrix growable in single dimension. However std:array<> size has to be defined in compile time. Is there any simple way how to do the same for runtime defined arrays?

我需要用它来处理数GB的数据，所以我很怀疑矢量向量会带来不必要的开销.

I need this for processing several GB of data so I'm affraid that vector of vectors would bring in unnecessary overhead.

推荐答案

我需要用它来处理数GB的数据，所以我很害怕向量的向量会带来不必要的开销.

I need this for processing several GB of data so I'm affraid that vector of vectors would bring in unnecessary overhead.

然后围绕一个一维 vector 编写一个包装器类，该类可以进行二维索引，并以一个固定维作为构造函数参数.

Then write a wrapper class around a one dimensional vector which allows two-dimensional indexing, and give the one fixed dimension as a constructor-argument.

这是最有效的方法，因为只有一个间接级别.

That is the most efficient way, since there is only one level of indirection.

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