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hehe, the complicated nesting scheme in Flagged in the previous commit

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was a sign that we were doing something wrong. In fact, having
NestByValue as a special case of Flagged was wrong, and the previous
commit, while not buggy, was inefficient because then when the resulting
NestByValue xpr was nested -- hence copied -- the original xpr which was
already nested by value was copied again; hence instead of 1 copy we got
3 copies.
The solution was to ressuscitate the old Temporary.h (renamed
NestByValue.h) as it was the right approach.
This commit is contained in:
Benoit Jacob
2008-05-28 05:14:16 +00:00
parent aebecae510
commit f54760c889
10 changed files with 108 additions and 24 deletions
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Eigen/src/Core/util/Constants.h
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@@ -45,7 +45,6 @@ const unsigned int SelfAdjointBit = 0x100; ///< means the matrix is selfadjoint
const unsigned int UpperTriangularBit = 0x200; ///< means the strictly triangular lower part is 0
const unsigned int LowerTriangularBit = 0x400; ///< means the strictly triangular upper part is 0
const unsigned int DirectAccessBit = 0x800; ///< means the underlying matrix data can be direclty accessed
const unsigned int NestByValueBit = 0x1000; ///< means the expression should be copied by value when nested
// list of flags that are inherited by default
const unsigned int HereditaryBits = RowMajorBit