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Cannot understand if this is circular dependency or Clang


Well, this doesn't completely tell you what's wrong, but hopefully will point you in the right direction. The problem is that quaternionbase_assign_impl doesn't support 3X1 matrices, it seems. (Unless there is other code that is getting into the translation unit somehow.) There is a forward declaration of it:

template<typename Other,
         int OtherRows=Other::RowsAtCompileTime,
         int
OtherCols=Other::ColsAtCompileTime>
struct quaternionbase_assign_impl;

Then there are two specializations:

template<typename Other>
struct quaternionbase_assign_impl<Other,3,3>
{ ... };

and

template<typename Other>
struct quaternionbase_assign_impl<Other,4,1>
{ ... };

There is no "generic" definition of the template. Thus, when the compiler tries to instantiate

Eigen::internal::quaternionbase_assign_impl<Eigen::Matrix<double,
3, 1, 0, 3, 1>, 3, 1>

there is no match. Note that the 3X1 comes from the forward declaration, where the default template arguments are given. If you post the full error message, we might be able to track down the beginning of the chain of instantiations that ultimately is trying to cause a 3X1 quaternionbase_assign_impl to be instantiated.


Categories : C++

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