Re: [boost] [optional] get() misses optional r-value overload in contrast to operator* and value()

Andrzej Krzemienski wrote:

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const auto& x = func0().value(); ... I am convinced that you are hitting an UB. Temporary returned by func0() is destroyed in the first line.

Interesting question. value() && returns T&&. The auto const& reference can't bind directly to T&&, because that's not an lvalue. So a temporary value of type T is created, and the auto const& binds to that, extending its life. That's of course assuming I read http://eel.is/c++draft/dcl.init.ref correctly.