Support ROOT 6.30 and C++20 #873
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The destructor and assignment operators are not allowed to include
template specializations in C++20.
They were not needed anyway, because the class itself is templated.
Also, generalize the assignment operators to take `TH1` and check for
the dimension at runtime. This is necessary to avoid other compiler
warnings, such as:
```
interface/FastTemplate.h:123:34: warning: ‘FastTemplate_t<T>& FastTemplate_t<T>::operator=(const TH1&) [with T = double]’ was hidden [-Woverloaded-virtual=]
123 | virtual FastTemplate_t & operator=(const TH1 &other) {
| ^~~~~~~~
interface/FastTemplate.h:284:24: note: by ‘FastHisto2D_t<double>::operator=’
284 | FastHisto2D_t& operator=(const TH2 &other) {
```
That is a very valid warning! `FastHisto2D_t` inherits from
`FastTemplate_t`, and it's not good if their assignment operators take
different types.
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Hi @anigamova and @kcormi, would it be fine to merge this? It's a purely technical change that enables us to try out new ROOT versions in order to see how combine can benefit from the newest RooFit features |
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Hi @guitargeek, thanks for these updates. Unfortunately with the relative paths, we had some issues previously as this was breaking the build in CMSSW, this popped up when we merged #809 and then was reverted to fix the compilation in #846. I think @nsmith- was planning to look into this, I wouldnt think it should be so difficult to fix, but I haven't done so since an original check when the build was breaking. |
This will not work anymore in ROOT 6.30. The `double` value needs to be retrieved from the proxy first.
guitargeek
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Ah ok, no problem! I have dropped the commit with the relative paths from this PR. After all, this was not relevant to support ROOT 6.30 with C++20, but only for my local build with CMake. |
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Okay, great, thanks! I think its fine then, and builds fine in CMSSW as well. |
The necessary changes to make combine compatible with ROOT 6.30 (and even
master) compiled with the C++20 standard.More detail in the commit descriptions.