C++29

Brno 2026 – · N5054 (current working draft)
39papers adopted
25features touched
1plenary
← C++26Show only C++29 on the map

Language

11 features
Small language features (C++29)5 papersPointer provenance & lifetime-end zap3 papersLexer & Unicode cleanup (C++26/29)also C++262 papersTemplates & concepts (core)also C++23, C++262 papersUB reduction & UB/IFNDR annexesalso C++262 papers#embed & preprocessor (C++26/29)also C++261 paperConstant evaluation (C++26)also C++261 paperContractsalso C++261 paperInitialization & value categoriesalso C++23, C++261 paperLambda improvementsalso C++231 paperPack indexingalso C++261 paper

Library

13 features · 1 housekeeping
Bit operationsalso C++232 papersConcurrency utilitiesalso C++23, C++262 papersFormatting improvements (C++26/29)also C++262 papersstd::simdalso C++262 papersAtomics & memory modelalso C++23, C++261 paperC compatibilityalso C++23, C++261 paperconstant_wrapper & nontypealso C++261 paperflat_map / flat_setalso C++23, C++261 paperiostreams & file streamsalso C++23, C++261 paperLibrary constexpr-ification (C++26)also C++261 papermdspanalso C++23, C++261 paperRanges (C++26)also C++261 paperstd::expectedalso C++23, C++261 paperCore & Library issue resolutionsalso 6 others2 papers

Papers per plenary

All 39 papers so far were adopted at Brno 2026.

BrnoJun 202639

Idioms in C++29

what changed in practice · from the Atlas
Parameter passingCore semanticsOwnership & lifetimesCore semanticsValue vs. reference semanticsCore semanticsMove semanticsCore semanticsInitializationCore semanticsConst & constexpr correctnessCore semanticsClass designDesignError handlingDesignPolymorphism choiceDesignAPI boundaries & vocabulary typesDesignCustomization pointsGeneric & compile-timeConstraint styleGeneric & compile-timeNamed idiomsGeneric & compile-timeAlgorithms & ranges over raw loopsCode-levelCasting disciplineCode-levelConcurrency idiomsCode-levelPhysical designCode-levelCoroutine machineryCompile-time & language mechanicsAsync compositionCompile-time & language mechanicsUB & object lifetimeCompile-time & language mechanicsDeclaration styleCompile-time & language mechanicsLambda idiomsCompile-time & language mechanicsName lookup hygieneCompile-time & language mechanicsAllocator awarenessMemory & performancePerformance idiomsMemory & performanceCode-size controlMemory & performanceGlobal state & init orderMemory & performanceString handlingText, numbers, timeInteger hygieneText, numbers, timechrono disciplineText, numbers, timeComparators & hashingText, numbers, timeC interop & ABIBoundaries & practiceFreestanding & embedded subsetBoundaries & practiceFeature detection & migrationBoundaries & practiceTooling-encoded idiomBoundaries & practice