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Niels Lohmann
86ea63185e
With GCC 10 and older in C++11/14 mode, a free to_json() for a type holding an optional<Dummy> (Dummy constructible from json) fails with "invalid use of incomplete type detector<...to_json_function...>". ADL for Dummy finds the unrelated to_json and closes an instantiation cycle through optional's converting constructor. The same error reproduces without the library, so it can't be fixed here. Add a FAQ entry explaining the cause and the hidden-friend workaround, recommend hidden friends in the arbitrary types docs, and add a regression test that keeps the workaround compiling on GCC 7-10. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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