deReg deleted the object it is deRegistering, but the main purpose of
this method is to undo the regiser process, which essentially means to
just give up ownership without deletion!

Use thread-local copies of the ToolHandleArray

If a property contains `[[deprecated]]` in its doc string, print a
deprecation warning on setting the property value.

If a property contains '[[deprecated]]' in its doc string, print a
deprecation warning on setting the property value.

ToolHandle is not thread-safe.
In order to be able to run thread initialization in parallel,
we need to make thread-local copies of the ToolHandleArray.

Needed to allow running part of the G4 initialization in parallel
for the ATLAS simulation.  Makes a significant difference  on many-core
machines like KNL.

Coverity claims:

 error #2443: defaulted default constructor cannot be constexpr
          because the corresponding implicitly declared default constructor
          would not be constexpr
    constexpr StatusCode() = default;

Independent of that there is little use of declaring the default
constructor as constexpr as it is calling the non-constexpr
default_category().

The lambda in deReg( TObject* ) tried to access vhid->at(0) after a
check for vhid->size() == 0. This resulted in a certain crash.

I've reorganized the function to delete the vector of THistIDs when
vhid->size() is 1 (not 0).
There is also a new test case that registers and deregisters a single
histogram.

Apply formatting

Add legacy methods for regGraph and regTree

Migrating the Athena in these cases would be possible, but not very
clean. This is why I decided to favor a consistent interface (with
similar methods for Hists, Trees and Graphs), opposed to only providing
unique_ptr methods. It would be good if future THistSvc clients would
pick up the new methods and old methods would be migrated over time.

The previous changes in the interface were to drastic. They would have
required too many changes for a service that is likely to be rewritten
for ROOT7 within the next 2 years anyway. (2018, 2019)

So here we offer a deprecated version without proper ownership
management that still works the same in the new implementation.

Fix wrong naming in ITHistSvcMT

Update ITHistSvc for better legacy support

There is now a deprecated regHist method with the old interface.
Since we don't want to spam too much during the Athena build, the new
regHist method, that transfers ownership, can also return a raw pointer
directly. This supports a very common use case in Athena, where the
registered histogram is used afterwards.
The migration is likely to be scriptable in this case.

Adapt new interface in THistSvc.h

Fix small typo in THistSvc.h

Update InterfaceID version in ITHistSvc

Fix wrong default parameter in interface

Fit implementation to new interface

Fix THistSvc tests and ref files

Remove TODOs that are not relevant yet

Apply formatting from CI artifacts

Update IHistSvc to be more consistent

Add THistSvc tests and fix reference

The write tests now also contains tests for the new regHist and
regShared/getShared methods.

Update dbg reference as well

Apply formatting patch

Remove deprecation attribute from ITHistSvc

This would introduce an additional warning for every Gaudi build, while
the intention is to discourage the use of its implementation in
THistSvc.h.
The interface method is still marked as deprecated through a doxygen
comment.

Add accidentally deleated return type to regHist

Comment out deprecation attribute in THistSvc.h

Initialize pointer in THistSvc tests

Add GAUDI_API back to ITHistSvc

Initialize all pointers in THistSvc

Apply clang formatting patch from CI

Hide deprecation warning behind ATLAS includeguard

Let the thistwrite ignore specific file sizes

Revert sortgroup regex

The previous change did not cover all of the necessary cases and was
wrong.

Apply formatting artifacts

Change test regex also for reading

Charles Leggett authored 7 years ago and Marco Clemencic committed 7 years ago

cherry-pick of !599

gaudi_add_compile_test can be used to add tests that check for the
existence of (expected) compilation failures. Use this to implement a
unit test to check for StatusCode comilation failures.

Closes #14

See merge request !546

add support for categories (domains) to `StatusCode by using typed
enums and ideas from `std::error_code`.

See merge request !581

See merge request !579

See merge request !578

See merge request !572

See merge request !509