Does valarray have contiguous memory alignment?

Question

Does valarray have contiguous memory alignment?

I want to pass a valarray to a function (from IPPS), which only takes pointers, by passing &

Answer 1

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):

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.