Re: [eigen] compiler error C2516 for EIGEN_WORKAROUND_MSVC_STL_SUPPORT in details.h

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Hi Stefan,

thanks for the test-program. I pushed a fix which hopefully works. ;)

The issue was that for std::vector<T> we tried at some point to derive
from T which works only if T is a class whereas you used a "float". I
agree that this should compile and work but initially the std::vector
workaround was intended for Eigen-types only.

A last comment on the fix which is primarily aimed at Benoit and Gael.
Currently I am assuming that if  "!internal::is_arithmetic<T>::value"
is exactly than true when "std::is_calss<T>::value" is true. I am not
sure whether this is actually correct but I am also a bit at a loss of
how to implement "is_class". The STL code here is so cryptic for that
traits helper and contains so many defines that I quit looking after
some time. Maybe you guys have an opinion whether we can live for the
moment with my hack or whether we should do something else.

- Hauke

On Wed, Dec 1, 2010 at 2:32 AM, Stefan Holzer <holzers@xxxxxxxxxxxxxxxx> wrote:
> Hi,
> I'm trying to port some code ( from Linux to
> Windows (Win7 x64 with Visual Studio 2010, compiling for 32-bit). This works
> fine except for a compiler error I get in Eigen/src/StlSupport/details.h in
> line 71:
> error C2516: 'T' is not a legal base class
> which occurs for the vector:
> std::vector<float, Eigen::aligned_allocator<float> > values;
> According to the comments in this file this piece of code is specially
> written for Visual Studio. Since the code works fine in Linux there might be
> something wrong with this VS-specific code. I also tested it with Visual
> Studio 2008 and it gives the same error.
> I would be happy about any suggestions.
> Thanks,
> Stefan

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