Re: [eigen] Alignment of a derived class

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On 18.07.2012 23:29, Gael Guennebaud wrote:
On Wed, Jul 18, 2012 at 4:18 AM, Martin Sälzle <martin.saelzle@xxxxxxxx> wrote:
struct Base
   Eigen::Vector4f vec4f_base;

struct Derived1 : public Base
   Eigen::Vector4f vec4f_derived_1;
The final question is what would happen for Derived1 if Base does note have EIGEN_MAKE_ALIGNED_OPERATOR_NEW?

On a 64bits system nothing special. On a 32bits system with SSE
enabled, an abort or segfault if you create a Derived1 on the heap
using "new Derived1".

Actually, if Derived1 still has an EIGEN_MAKE_ALIGNED_OPERATOR_NEW, it should be ok to use `new Derived1`, shouldn't it?

Of course it is better to just add EIGEN_MAKE_ALIGNED_OPERATOR_NEW to the base class -- and it won't harm if you add it to the derived classes as well.


Dipl.-Inf. Christoph Hertzberg
Cartesium 0.049
Universität Bremen
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