是否有valarray的连续内存对齐？ [英] Does valarray have contiguous memory alignment?

问题描述

确实的valarray 要有连续的内存对齐？

Does valarray have contiguous memory alignment?

我要valarray中传递（从IPPS）的函数，它只需指针，通过传递＆放大器; myValarray [0] 。但因此，我应该是肯定的，那的valarray的内存对齐是连续的。

I want to pass a valarray to a function (from IPPS), which only takes pointers, by passing &myValarray[0]. But therefore I should be sure, that valarray's memory alignment is contiguous.

谢谢！

推荐答案

假设你问一个valarray的管理的内存是否被保证的连续的，那么答案是肯定的，至少如果对象不是常量（C ++ 03，§26.3.2.3/ 3或C ++ 11，§26.6.2.4/ 2）：

Assuming you're asking whether the memory managed by a valarray is guaranteed to be contiguous, then the answer is yes, at least if the object isn't const (C++03, §26.3.2.3/3 or C++11, §26.6.2.4/2):

这位前pression＆放大器;一个[I + J] ==＆放大器;一个由[i] + j的评估所有为size_t作为真正的我，并为size_tĴ这样
  条件是i + j是小于非恒定阵列的长度的

The expression &a[i+j] == &a[i] + j evaluates as true for all size_t i and size_t j such that i+j is less than the length of the non-constant array a.

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