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The standard does not allow std::optional<T&>, std::optional<T[1]>, std::optional<T()> etc. and although we do give errors, they come from down inside the internals of std::optional. We could improve the static assertions at the top of the class so that users get a more precise diagnostic: optional:721:21: error: static assertion failed 721 | static_assert(is_object_v<_Tp> && !is_array_v<_Tp>); libstdc++-v3/ChangeLog: * include/std/optional (optional): Adjust static assertion to reject arrays and functions as well as references. * testsuite/20_util/optional/requirements_neg.cc: New test. |
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| c++tools | ||
| config | ||
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| libgfortran | ||
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| libtool.m4 | ||
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