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attempt to fix #101

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This commit is contained in:
Benoit Jacob 2010-03-11 12:41:46 -05:00
parent 2a82b162d7
commit 3e08c22028
1 changed files with 12 additions and 3 deletions
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15
Eigen/src/Core/util/ForwardDeclarations.h
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@ -41,10 +41,19 @@ template<typename ExpressionType> class NestByValue;
template<typename ExpressionType> class ForceAlignedAccess;
template<typename ExpressionType> class SwapWrapper;
template<typename MatrixType> class Minor;
// MSVC will not compile when the expression ei_traits<MatrixType>::Flags&DirectAccessBit
// is put into brackets like (ei_traits<MatrixType>::Flags&DirectAccessBit)!
// MSVC has a big bug: when the expression ei_traits<MatrixType>::Flags&DirectAccessBit ? HasDirectAccess : NoDirectAccess
// is used as default template parameter value here, it gets mis-evaluated as just ei_traits<MatrixType>::Flags
// Moreover, adding brackets tends to give compilation errors with MSVC.
// Solution: defer that to a helper struct.
template<typename MatrixType>
struct ei_block_direct_access_status
{
enum { ret = ei_traits<MatrixType>::Flags&DirectAccessBit ? HasDirectAccess : NoDirectAccess };
};
template<typename MatrixType, int BlockRows=Dynamic, int BlockCols=Dynamic,
int _DirectAccessStatus = ei_traits<MatrixType>::Flags&DirectAccessBit ? HasDirectAccess : NoDirectAccess> class Block;
int _DirectAccessStatus = ei_block_direct_access_status<MatrixType>::ret> class Block;
template<typename MatrixType, int Size=Dynamic> class VectorBlock;
template<typename MatrixType> class Transpose;
template<typename MatrixType> class Conjugate;