GCC moved it to <optional> with the release of GCC7.
Note that we're now at GCC8, clang 4 added it - I believe we're now at clang 6.
Therefore, it's by far no longer something that's experimental IMHO. (standardised in C++17 after all)
Therefore, it's by far no longer something that's experimental IMHO. (standardised in C++17 after all)
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