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Re:DCompute: GPGPU with Native D for OpenCL and CUDA by WalterBright on Monday July 17, 2017 @04:07PM (#14791897)
I'm not familiar with that aspect of C++17.
Re:DCompute: GPGPU with Native D for OpenCL and CUDA by nicwilson on Monday July 17, 2017 @08:11PM (#14793371)
Its the tag based dispatching for the `par` in

std::sort(par,a.begin(),a.end());

to call a parallel implementation of sort on `a`.