Dynamically allocating StaticVector instances?

[Антон М]

Sorry if I am missing something obvious, just started to use blaze. For me the following code segfaults in the StaticVector copy constructor:

    std::vector<blaze::StaticVector<float, 32>> vec;
    for (auto i = 0u; i < 100; i++) vec.emplace_back();

Is this expected?

[Klaus Iglberger]

Hi Антон!

Thanks for creating this issue. The problem is the default allocator of std::vector, which does not provide the right alignment for its data. In order to adhere to the alignment restrictions of StaticVector, please use a blaze::AlignedAllocator:

using VT = blaze::StaticVector<float, 32>;
std::vector<VT,blaze::AlignedAllocator<VT>> vec;
for (auto i = 0u; i < 100u; ++i) vec.emplace_back();

That will fix the problem.

Best regards,

Klaus!

[Klaus Iglberger]

Hi Антон!

The alignment requirements of a StaticVector data member are "inherited" by the containing struct. Therefore the solution will also work in this scenario. Unfortunately both the wiki and the tutorial are a little silent on this kind of issue. We should extend both to help users to avoid this kind of problem.

Best regards,

Klaus!