WG21 PAPERS

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Filter and export papers from the C++ Committee’s monthly mailings by time frame and audience using the options below, or refine your export further with the Select button. Links point directly to the official WG21 papers on open-std.org.

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Select	Paper	Title	Authors	Audience
	P3377R0	constexpr `reinterpret_cast` partial replacements	H. Dusíková, G. Ažman	EWG LEWG
Mailing Date 2026-05 Pre-Brno Author(s) Hana Dusíková, Gašper Ažman Target Audience EWG LEWG Tracking issue View on GitHub Abstract \| functionality \| runtime only (current status) \| runtime & constexpr compatible replacement \| status \| \| --- \| --- \| --- \| --- \| \| pointer ↔︎ integer \| `intptr_t * iptr = reinterpret_cast<intptr_t>(ptr); auto * optr = reinterpret_cast<pointer>(iptr);` \| — \| not proposed \| \| pointer tagging \| `auto tptr = reinterpret_cast<pointer>( reinterpret_cast<intptr_t>(ptr) \\| 0b1u); auto tag = static_cast<b
	P3818R2	constexpr exception library which is unsurprising in potentially constant initialization	H. Dusíková	EWG LEWG
Mailing Date 2026-05 Pre-Brno Author(s) Hana Dusíková Target Audience EWG LEWG Tracking issue View on GitHub Abstract To make `constexpr` exception support complete, and allow all functionality withing constant evaluation. This paper was seen in previous revision by LEWG. It didn't get consensus and most of the group prefered the conservative approach of removing `constexpr` from `std::uncaught_exception()` and `std::current_exception()`. The group asked me to revisit this again for C++29.
	P4147R0	constexpr => runtime bridge	H. Dusíková	EWG
Mailing Date 2026-05 Pre-Brno Author(s) Hana Dusíková Target Audience EWG Tracking issue View on GitHub Abstract This paper introduces a customization point which is called when a constant-evaluated value is moving outside of its constant-evaluation (like initialization of `constexpr` variable, or `consteval` function emitting a value to an expression / function evaluated at runtime).
	P4167R0	reflection annotations to control ADL	H. Dusíková	EWG
Mailing Date 2026-05 Pre-Brno Author(s) Hana Dusíková Target Audience EWG Tracking issue View on GitHub Abstract This papers provides a customization for ADL via a annotation to add an entity to be associated with a type. It adds a new `<meta>` type to represent the annotation, and it modifies [`[basic.lookup.argdep]`](https://eel.is/c++draft/basic.lookup.argdep)

Showing 4 of 4 papers · source: open-std.org

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