Skip to content

8314644: Change "Rvalue references and move semantics" into an accepted feature #15386

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
wants to merge 4 commits into from
Closed

8314644: Change "Rvalue references and move semantics" into an accepted feature #15386

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
4 commits
Select commit Hold shift + click to select a range
39ee691
Move over Rvalue references and move semantics to permitted features
jdksjolen Aug 22, 2023
a85b1d1
Also update html
jdksjolen Aug 22, 2023
0d117e8
Expand on the feature
jdksjolen Oct 24, 2023
2cba5f2
Add a (admittedly clunky) single asterisk
jdksjolen Oct 24, 2023
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
3 changes: 2 additions & 1 deletion doc/hotspot-style.html
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1093,6 +1093,8 @@ <h3 id="attributes">Attributes</h3>
<h3 id="additional-permitted-features">Additional Permitted
Features</h3>
<ul>
<li><p>Rvalue references and move semantics (<a
href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1690.html">n1690</a>)</p></li>
<li><p><code>alignof</code> (<a
href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2341.pdf">n2341</a>)</p></li>
<li><p><code>constexpr</code> (<a
Expand Down Expand Up @@ -1203,7 +1205,6 @@ <h3 id="undecided-features">Undecided Features</h3>
href="https://isocpp.org/files/papers/N3651.pdf">n3651</a>)</p></li>
<li><p>Member initializers and aggregates (<a
href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3653.html">n3653</a>)</p></li>
<li><p>Rvalue references and move semantics</p></li>
</ul>
</body>
</html>
13 changes: 11 additions & 2 deletions doc/hotspot-style.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1086,6 +1086,17 @@ The following attributes are expressly forbidden:

### Additional Permitted Features

* Rvalue references and move semantics
([n1690](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1690.html))
* Use `std::move` when moving an object.
Rvalue references and move semantics is an advanced C++ concept and should be
treated as such. In HotSpot we prefer copy construction when possible.
However, we do recognize that there are cases where move semantics permit significant
ergonomic and performance advantages to the developer.
For example, if you have a data structure T which is non-copyable but needs to
be stored in a resizable container, then defining a move constructor may be preferable
to changing the contained element type from T to T\*.

* `alignof`
([n2341](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2341.pdf))

Expand Down Expand Up @@ -1210,8 +1221,6 @@ features that have not yet been discussed.
* Member initializers and aggregates
([n3653](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3653.html))

* Rvalue references and move semantics

[ADL]: https://en.cppreference.com/w/cpp/language/adl
"Argument Dependent Lookup"

Expand Down