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c++: prefer a perfect forwarding version of variant's emplace

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* data/variant.hh (emplace): In modern C++, use only a perfect
forwarding version.
And use it.
* doc/bison.texi: Document it.
This commit is contained in:
Akim Demaille
2018-10-20 14:25:45 +02:00
parent 42f0b949ec
commit 3ead69b1c1
2 changed files with 24 additions and 7 deletions
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doc/bison.texi
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@@ -10836,12 +10836,17 @@ in midrule actions. It is mandatory to use typed midrule actions
(@pxref{Typed Midrule Actions}).
@deftypemethod {semantic_type} {T&} emplace<T> ()
Initialize, but leave empty. Returns the address where the actual value may
be stored. Requires that the variant was not initialized yet.
Initialize, but leave empty. Return a reference to where the actual value
may be stored. Requires that the variant was not initialized yet.
@end deftypemethod
@deftypemethod {semantic_type} {T&} emplace<T> (const T& @var{t})
Initialize, and copy-construct from @var{t}.
Initialize, and copy-construct from @var{t}. Available in C++98/C++03 only.
@end deftypemethod
@deftypemethod {semantic_type} {T&} emplace<T, U> (U&& @var{u})
Build a variant of type @code{T} from the forwarding reference @var{u}.
Available in C++11 and later only.
@end deftypemethod