Kona 2025

November 2025 plenary · adopted into C++26
26papers adopted
20features touched
← Sofia 2025Croydon 2026 →

Core & Library issue resolutions

3 papers
P3905R0C++ Standard Library Ready Issues to be moved in Kona, Nov. 2025C++26P3906R0C++ Standard Library Immediate Issues to be moved in Kona, Nov. 2025C++26P3921R0Core Language Working Group “ready” Issues for the November, 2025 meetingC++26

Iterators & algorithms (misc)

2 papers
P3016R6Resolve inconsistencies in begin/end for valarray and braced initializer listsC++26P3612R1Harmonize proxy-reference operations (LWG 3638 and 4187)C++26

NB-comment omnibus & housekeeping

2 papers
P3914R0Assorted NB comment resolutions for Kona 2025C++26P3923R0Additional NB comment resolutions for Kona 2025C++26

std::execution (senders/receivers)

2 papers
P3388R3When Do You Know connect Doesn’t Throw?C++26P3887R1Make when_all a Ronseal AlgorithmC++26

std::optional

2 papers
P3836R2Make optional trivially copyableC++26P3913R1Optimize for std::optional in range adaptorsC++26

async_scope

1 paper
P3815R1Add scope_association concept to P3149C++26

Atomics & memory model

1 paper
P3860R1Proposed Resolution for NB Comment GB13-309 atomic_ref is not convertible to atomic_refC++26

constant_wrapper & nontype

1 paper
P3774R1Rename std::nontype, and make it broadly usefulC++26

Contracts

1 paper
P3819R0Remove evaluation_exception() from contract-violation handling for C++26C++26

Erroneous behaviour & observable checkpoints

1 paper
P3684R1Fix erroneous behaviour termination semantics for C++26C++26

Expansion statements

1 paper
P1789R3Library Support for Expansion StatementsC++26

flat_map / flat_set

1 paper
P3567R2flat_meow fixesC++26

Formatting improvements (C++26/29)

1 paper
P3391R2constexpr std::formatC++26

Linear algebra (BLAS)

1 paper
P3371R5Fix C++26 by making the rank-1, rank-2, rank-k, and rank-2k updates consistent with the BLASC++26

mdspan

1 paper
P3663R3Future-proof submdspan_mappingC++26

Modules fixes

1 paper
P3868R1Allow #line before module declarationsC++26

Standard library hardening

1 paper
P3878R1Standard library hardening should not use the 'observe' semanticC++26

std::simd

1 paper
P3922R1Missing deduction guide from simd::mask to simd::vecC++26

Trivial relocatability

1 paper
P3920R0Wording for NB comment resolution on trivial relocationC++26

type_order

1 paper
P3778R0Fix for type_order template definitionC++26