Lightning Talk: Direct Aggregate Initialisation
summary
C++20 adds direct aggregate initialization: using parentheses triggers aggregate initialization, enabling things like perfect-forwarding into aggregates and making macros with commas work so you can implement in_place_back. It also diverges from braced list-initialization: parentheses allow narrowing, do not perform brace elision for nested aggregates, and do not extend lifetimes of temporaries so you can get a dangling reference. Parens also retain preexisting value‑initialization meaning, producing unexpected zero‑init in some omitted‑initializer cases.
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