Specialize Base.axes for [Composite/Adjoint/Transpose]Maps

[dkarrasch]

No description provided.

[codecov]

Codecov Report

Merging #164 (1cadef7) into master (e575b5f) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #164   +/-   ##
=======================================
  Coverage   99.43%   99.43%           
=======================================
  Files          14       14           
  Lines        1061     1064    +3     
=======================================
+ Hits         1055     1058    +3     
  Misses          6        6           

Impacted Files	Coverage Δ
src/LinearMaps.jl	97.75% <100.00%> (+0.02%)	⬆️
src/composition.jl	100.00% <100.00%> (ø)
src/transpose.jl	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e575b5f...1cadef7. Read the comment docs.

[dkarrasch]

@krcools Do you see any potential issue with this?

[krcools]

Thank you for including this also for CompositeMaps. I don't see any issue, apart from maybe we can also get this to work for TransposeMaps and AdjointMaps in a single release.

[dkarrasch]

That's difficult to test though, because transpose and adjoint of WrappedMaps of AbstractMatrices are passed to the matrix, so we get a WrappedMap{Transpose{BlockMatrix}}, roughly speaking. Or, in other words, transpose and adjoint work out of the box for BlockMatrix-based LinearMaps.

EDIT: We can test that by re-wrapping into a WrappedMap.