C++26

Varna 2023 – Croydon 2026 · N5050 (DIS basis, __cplusplus 202603L)
276papers adopted
61features touched
9plenaries
← C++23C++29 →Show only C++26 on the map

Language

19 features
Reflection10 papersTemplates & concepts (core)also C++23, C++297 papersConstant evaluation (C++26)also C++295 papersCore wording overhaulsalso C++234 papersErroneous behaviour & observable checkpoints4 papersLexer & Unicode cleanup (C++26/29)also C++294 papersSmall language features (C++26)4 papersStructured bindings4 papers#embed & preprocessor (C++26/29)also C++293 papersInitialization & value categoriesalso C++23, C++293 papersModules fixesalso C++233 papersObject lifetime & unionsalso C++233 papersContractsalso C++292 papersExpansion statements2 papersTrivial relocatability2 papersAttributesalso C++231 paperCTAD improvementsalso C++231 paperPack indexingalso C++291 paperUB reduction & UB/IFNDR annexesalso C++291 paper

Library

40 features · 2 housekeeping
std::execution (senders/receivers)16 papersstd::simdalso C++2915 papersFormatting improvements (C++26/29)also C++2912 papersLibrary constexpr-ification (C++26)also C++2911 papersRanges (C++26)also C++2911 papersDeprecations & removalsalso C++2310 papersAtomics & memory modelalso C++23, C++299 papersmdspanalso C++23, C++299 papersFreestanding libraryalso C++237 papersIterators & algorithms (misc)7 papersStrings & string_viewalso C++235 papersconstant_wrapper & nontypealso C++294 papersCoroutine task type4 papersLinear algebra (BLAS)4 papersRandom numbers4 papersstd::optionalalso C++234 paperstuple, pair & variantalso C++234 papersType-erased callablesalso C++234 papersUtilities & type traitsalso C++234 papersC compatibilityalso C++23, C++293 papersConcurrency utilitiesalso C++23, C++293 papersExceptions & exception_ptralso C++233 papersParallel scheduler3 papersStandard library hardening3 papersstd::span3 paperstype_order3 papersAssociative container lookupsalso C++232 papersasync_scope2 paperschrono & ratioalso C++232 papersDebugging support2 papersinplace_vector2 papersiostreams & file streamsalso C++23, C++292 papersParallel range algorithms2 papersSaturation arithmetic2 paperstext_encoding2 papersflat_map / flat_setalso C++23, C++291 paperindirect & polymorphic1 paperSmart pointers & allocatorsalso C++231 paperstd::expectedalso C++23, C++291 paperstd::hive1 paperCore & Library issue resolutionsalso 6 others20 papersNB-comment omnibus & housekeepingalso 5 others4 papers

Papers per plenary

Croydon 2026 was the busiest plenary: 48 papers adopted into C++26.

VarnaJun 202340KonaNov 202323TokyoMar 202426St. LouisJun 202417WrocławNov 202426HagenbergFeb 202525SofiaJun 202545KonaNov 202526CroydonMar 202648

Idioms in C++26

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