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  • Steffen Müthing's avatar
    Make Child<> an invalid type if the child cannot be extracted · 167cc792
    Steffen Müthing authored 
    The type alias `Child<Node,...>` used to simply be `void` if the child type
could not be extracted. That is rather unhelpful, as it makes it impossible to
use in SFINAE.

This patch changes the behavior by making it impossible to instantiate the type
alias if there is no valid child.
    167cc792
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