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vtk-m/docs/changelog/deprecate-virtual-methods.md
Kenneth Moreland cd08fd4995 Add changelog for removing virtual methods 
The changelog is not quite accurate because it is claiming that all
virtual methods are removed when that is not quite the case.
Hopefully soon the changelog text will be accurate.
2020-09-04 22:52:45 -06:00

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Virtual methods in execution environment deprecated

The use of classes with any virtual methods in the execution environment is deprecated. Although we had code to correctly build virtual methods on some devices such as CUDA, this feature was not universally supported on all programming models we wish to support. Plus, the implementation of virtual methods is not hugely convenient on CUDA because the virtual methods could not be embedded in a library. To get around virtual methods declared in different libraries, all builds had to be static, and a special linking step to pull in possible virtual method implementations was required.

For these reasons, VTK-m is no longer relying on virtual methods. (Other approaches like multiplexers are used instead.) The code will be officially removed in version 2.0. It is still supported in a deprecated sense (you should get a warning). However, if you want to build without virtual methods, you can set the VTKm_NO_DEPRECATED_VIRTUAL CMake flag, and they will not be compiled.