Implementations of C++20 concepts and requires#120
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…aits to RandomIteratorTraits.h
…CN1/2.inl constraint bugs
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We implemented C++20
conceptsin Hydra and introducedrequiresstatements, in order to replace many verbose constraints on template arguments to take benefit of SFINAE rule, by usingenable_if<>.Tested compilation:
Host backends (CPP / OMP / TBB): full build of the examples + test suite, all unit tests pass (Catch2). GCC 15.2.1, --std=c++20.
CUDA backend: compiles cleanly under nvcc CUDA 12.6.2 (nvcc V12.6.77, host compiler GCC 11.4.0), --std=c++20, -arch=sm_70. The full example set + test suite were compile-verified.