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Peter Dimov
2017-06-14 01:08:29 +03:00
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@ -22,9 +22,9 @@ The class `boost::variant2::variant<T...>` is an almost conforming implementatio
To avoid going into a valueless-by-exception state, this implementation falls back to using double storage unless
* all the contained types are nothrow move constructible, or
* the list of alternatives contains the type `valueless`.
* the first alternative is the type `valueless`.
If the second bullet doesn't hold, but the first does, the variant uses single storage, but `emplace` constructs a temporary and moves it into place if the construction of the object can throw. In case this is undesirable, one can force `emplace` into always constructing in-place by adding `valueless` to the list of alternatives.
If the second bullet doesn't hold, but the first does, the variant uses single storage, but `emplace` constructs a temporary and moves it into place if the construction of the object can throw. In case this is undesirable, one can force `emplace` into always constructing in-place by adding `valueless` as a first alternative.
## expected.hpp