C ++向量是否总是连续的? [英] Are C++ Vectors always contiguous?

问题描述

可能重复:
std :: vector元素是否保证是连续的?

我遇到过一种技术，人们可以使用C ++中的向量来接收或发送MPI操作数据，因为据说它可以将元素连续存储在内存中.

I have come across a technique in which people use a vector in C++ to receive or send data for MPI operations as it is said to store elements contiguously in memory.

但是，我仍然怀疑这种方法是否适用于任何大小的向量，尤其是当向量增长到一定大小时，这种假设可能会破裂.

However, I remain skeptical of whether this approach would remain robust for a vector of any size, especially when the vector grows to a certain size, where this assumption could break down.

下面是我正在谈论的一个例子:

Below is an example of what I am talking about :

MPI_Recv( &partials[0] , partials.size() , mpi_partial , 0, 
         DALG_ELIMINATE_REQ_MSG ,MPI_COMM_WORLD , &status );

推荐答案

是的，无论大小如何，C ++向量始终是连续的.

Yes, C++ vectors are always contiguous, regardless of size.

但是并不意味着它们在您缩小或扩展它们时不会在内存中四处移动.

But that doesn't mean that they don't move around in memory as you shrink or expand them...

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