Brno 2026

June 2026 plenary · adopted into C++29
39papers adopted
25features touched
← Croydon 2026

Small language features (C++29)

5 papers
P2953R5Adding restrictions to defaulted assignment operator functionsC++29P3424R2Deallocation Functions with Throwing Exception Specification Are Ill-formedC++29P3668R4Defaulting Postfix Increment and Decrement OperationsC++29P3785R1Library Wording Changes for Defaulted Postfix Increment and Decrement OperationsC++29P3950R1return_value & return_void Are Not Mutually ExclusiveC++29

Pointer provenance & lifetime-end zap

3 papers
P2414R12Pointer lifetime-end zap proposed solutionsC++29P2434R5Nondeterministic pointer provenanceC++29P3347R6Invalid Pointer OperationsC++29

Bit operations

2 papers
P3104R6Bit permutationsC++29P3793R2Better shiftingC++29

Concurrency utilities

2 papers
P2019R9Thread attributesC++29P3428R4Hazard Pointer BatchesC++29

Core & Library issue resolutions

2 papers
P4258R0C++ Standard Library Ready Issues to be moved in Brno, Jun. 2026C++29P4271R0Core Language Working Group "ready" Issues for the June, 2026 meetingC++29

Formatting improvements (C++26/29)

2 papers
P3395R6Fix encoding issues and add a formatter for std::error_codeC++29P3505R4Fix the default floating-point representation in std::formatC++29

Lexer & Unicode cleanup (C++26/29)

2 papers
P3658R1Adjust _identifier_ following new Unicode recommendationsC++29P3733R1More named universal character escapesC++29

std::simd

2 papers
P3319R6Add an iota object for SIMD (and more)C++29P3772R2std::simd overloads for bit permutationsC++29

Templates & concepts (core)

2 papers
P2243R0Language linkage for templatesC++29P3822R2Conditional noexcept specifiers in compound requirementsC++29

UB reduction & UB/IFNDR annexes

2 papers
P3596R3Undefined Behavior and IFNDR AnnexesC++29P3899R3Clarify the behavior of floating-point overflowC++29

#embed & preprocessor (C++26/29)

1 paper
P3540R3#embed offset parameterC++29

Atomics & memory model

1 paper
P3692R4How to Avoid OOTA Without Really TryingC++29

C compatibility

1 paper
P3248R5Require [u]intptr_tC++29

Constant evaluation (C++26)

1 paper
P4101R1Consteval-only Values for C++26C++29

constant_wrapper & nontype

1 paper
P4206R0Revert string support in std::constant_wrapperC++29

Contracts

1 paper
P3097R3Contracts for C++: Virtual functionsC++29

flat_map / flat_set

1 paper
P3091R6Better Lookups for map, unordered_map, and flat_mapC++29

Initialization & value categories

1 paper
P2287R6Designated-initializers for Base ClassesC++29

iostreams & file streams

1 paper
P3154R3Deprecating signed character types in iostreamsC++29

Lambda improvements

1 paper
P3847R1Lexical order for lambdasC++29

Library constexpr-ification (C++26)

1 paper
P3125R6constexpr pointer taggingC++29

mdspan

1 paper
P3242R4Copy and fill for mdspanC++29

Pack indexing

1 paper
P3670R4Pack Indexing for Template NamesC++29

Ranges (C++26)

1 paper
P3052R2view_interface::at()C++29

std::expected

1 paper
P3798R1The unexpected in std::expectedC++29