it's defined enough for C to have adopted it since C11 (https://people.mpi-sws.org/~viktor/papers/cpp2015-invited.pdf https://people.mpi-sws.org/~viktor/papers/

it's defined enough for C to have adopted it since C11 (https://people.mpi-sws.org/~viktor/papers/cpp2015-invited.pdf https://people.mpi-sws.org/~viktor/papers/cpp2015-invited.pd...)