[DF] Decouple type of RVariation storage from type returned by Vary expression
To this end, we now propagate compile-time information on how many columns are varied (one or more than one simultaneously) down from Vary to RVariation.
We can take advantage of this information to simplify a number of
helper functions, e.g. substituting SFINAE with simple function
overloading, and to specify a storage type for results of Vary expressions potentially different from the type returned by the expression itself, which will be necessary to implement bulk evaluation of systematic variations.
Starting build on ROOT-debian10-i386/soversion, ROOT-performance-centos8-multicore/cxx17, ROOT-ubuntu18.04/nortcxxmod, ROOT-ubuntu2004/python3, mac1015/cxx17, mac11/cxx14, windows10/cxx14
How to customize builds
Starting build on ROOT-debian10-i386/soversion, ROOT-performance-centos8-multicore/cxx17, ROOT-ubuntu18.04/nortcxxmod, ROOT-ubuntu2004/python3, mac1015/cxx17, mac11/cxx14, windows10/cxx14
How to customize builds
rebased to fix issues with xrootd, but the only new commits are the last 3, which address some of the review comments
Starting build on ROOT-debian10-i386/soversion, ROOT-performance-centos8-multicore/cxx17, ROOT-ubuntu18.04/nortcxxmod, ROOT-ubuntu2004/python3, mac1015/cxx17, mac11/cxx14, windows10/cxx14
How to customize builds
Build failed on ROOT-ubuntu2004/python3. Running on root-ubuntu-2004-3.cern.ch:/home/sftnight/build/workspace/root-pullrequests-build See console output.
Failing tests:
Build failed on mac1015/cxx17. Running on macitois21.dyndns.cern.ch:/Users/sftnight/build/workspace/root-pullrequests-build See console output.
Failing tests:
Starting build on ROOT-debian10-i386/soversion, ROOT-performance-centos8-multicore/cxx17, ROOT-ubuntu18.04/nortcxxmod, ROOT-ubuntu2004/python3, mac1015/cxx17, mac11/cxx14, windows10/cxx14
How to customize builds
Build failed on mac1015/cxx17. Running on macitois21.dyndns.cern.ch:/Users/sftnight/build/workspace/root-pullrequests-build See console output.