callback: forward rvalue args - #950
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Preserve value category in callback::builder::run so services taking T&& receive rvalues instead of lvalues. Add a regression test for callback::service<MoveOnlyPayload&&>. Signed-off-by: Benedek Kupper <kupper.benedek@gmail.com>
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The reason it didn't do this before is that it's inside a fold expression. If there are multiple calllbacks you end up with a use-after-move. |
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This is a valid concern and one that I pondered too, but without a better alternative in mind I went with it anyway (just adding a comment at the callback type definition). For correctness though it should either allow rvalue forwarding, or explicitly forbid it by a |
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Preserve value category in callback::builder::run so services taking T&& receive rvalues instead of lvalues.
Add a regression test for callback::service<MoveOnlyPayload&&>.