On Wednesday, 30 August 2017 at 16:45:19 UTC, data pulverizer wrote:
One thing that confused me was examples like this ...

Matrix _plus(DiagonalMatrix a, DiagonalMatrix b)
  // just add the elements on diagonals
  // return a DiagonalMatrix

Which is marked as returning a DiagonalMatrix rather than a Matrix by polymorphism however the function is marked Matrix return type.

Indeed returning a DiagonalMatrix would work, and is marginally more useful (in case you want to call the specialization directly). I'll update the example. Thanks.

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