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C++26

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C++标准的下一代版本。

C++26 的当前国际标准制定日程： P1000R6 （2024-05-14）。

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目录

新语言特性

新库特性

新增模块

新增头文件

C 兼容性头文件：

已弃用功能

已移除功能

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已弃用功能

本节内容尚不完整

缺陷报告

编译器支持

主要文章： C++26 编译器支持

C++26 核心语言特性

C++26 特性

提案文档

GCC
Clang
MSVC
Apple Clang
EDG eccp
Intel C++
Nvidia HPC C++ (ex PGI)*
Nvidia nvcc
Cray
DR98：从词法分析中移除未定义行为 P2621R3 是 3.3 16.0.0*
DR98：使不可编码字符串字面量成为病式 P1854R4 14 14 16.0.0*
未求值字符串 P2361R6 14 17 (部分)*
18 		16.0.0*
向 基础字符集 添加 @ 、 $ 和 ` P2558R2 15 是 16.0.0*
constexpr 从 void * 转换  ( FTM ) * P2738R1 14 17
DR20：关于标准属性的可忽略性 P2552R3 15 是
DR11：大括号初始化器的静态存储 P2752R3 14
用户生成的 static_assert 消息  ( FTM ) * P2741R3 14 17
无名称占位符变量 ( FTM ) * P2169R4 14 18
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C++26 标准库特性

C++26 feature

Paper(s)

GCC libstdc++
Clang libc++
MSVC STL
Apple Clang*
Testing for success or failure of <charconv> functions  ( FTM ) * P2497R0 14 18 16.0.0*
std::text_encoding : text encodings identification  ( FTM ) * P1885R12
P2862R1 		14
Arithmetic overloads of std::to_string and std::to_wstring use std::format ( FTM ) * P2587R3 14
Type checking format args  ( FTM ) * P2757R3 15
Formatting pointers  ( FTM ) * P2510R3 14 * 17 * 19.40* *
Hashing support for std::chrono value classes  ( FTM ) * P2592R3
<rcu> : Read-Copy Update ( FTM ) * P2545R4
<hazard_pointer> : Hazard pointers ( FTM ) * P2530R3
ADL-proof std::projected P2538R1 14 * 18 * 19.38* * 16.0.0*
constexpr stable sorting  ( FTM ) * P2562R1 15 21
Member std::basic_format_arg::visit() ( FTM ) * P2637R3 15 19
Member std::variant::visit() ( FTM ) * P2637R3 15 18
std::is_within_lifetime ( FTM ) * P2641R4
Extending associative containers with the remaining heterogeneous overloads  ( FTM ) * P2363R5
Enabling the use of std::weak_ptr as keys in unordered associative containers  ( FTM ) * P1901R2
Native handles in file streams  ( FTM ) * P1759R6 14 18 16.0.0*
Interfacing string streams with std::string_view ( FTM ) * P2495R3 19
Interfacing std::bitset with std::string_view ( FTM ) * P2697R1 18 16.0.0*
More constexpr for <cmath> and <complex> ( FTM ) * ( FTM ) * P1383R2 4.6 (partial)*
Adding the new 2022 SI prefixes on ratios: std::quecto , std::ronto , std::ronna , and std::quetta ( FTM ) * P2734R0 14 17 *
std::function_ref : type-erased callable reference  ( FTM ) * P0792R14
std::copyable_function ( FTM ) * P2548R6 16
std::bind_front , std::bind_back , and std::not_fn to NTTP callables  ( FTM ) * ( FTM ) * ( FTM ) * P2714R1
std::submdspan() ( FTM ) * P2630R4
P3355R1
Freestanding language: Optional ::operator new P2013R5 N/A
Freestanding std::char_traits , std::errc and facilities in: <charconv> , <cstdlib> , <cstring> , <cwchar> ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * P2338R4 N/A
More freestanding facilities  ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * P2198R7 N/A
Saturation arithmetic ( FTM ) * P0543R3 14 18 16.0.0*
<debugging> : Debugging support ( FTM ) * P2546R5
P2810R4
<linalg> : A free function linear algebra interface based on the BLAS  ( FTM ) * P1673R13
P3050R2
P3222R0
Making assert() macro user friendly P2264R7
Runtime format strings  ( FTM ) * P2918R2 14 18 16.0.0*
std::span over an initializer list  ( FTM ) * P2447R6 15 18 16.0.0*
std::span::at() ( FTM ) * P2821R5 14 18 16.0.0*
Added tuple protocol to std::complex ( FTM ) * P2819R2 15 19
A new specification for std::generate_canonical P0952R2 19.42*
Removing deprecated typedef std::allocator::is_always_equal P2868R3 15 18 16.0.0*
Removing function overload of std::basic_string::reserve() that takes no argument P2870R3 18 16.0.0*
Removing deprecated Unicode conversion facets ( <codecvt> ) P2871R3 18 16.0.0*
Freestanding: removing std::strtok ( FTM ) * P2937R0 14 19.40*
Freestanding library: partial classes  ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * P2407R5 14 19.42*
Freestanding library: std::inout , std::expected , std::span ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * P2833R2 14 19.42*
DR23: std::basic_const_iterator should follow its underlying type’s convertibility  ( FTM ) * P2836R1
P2950R0 		14 19.40*
DR20: std::make_format_args now accepts only lvalue references instead of forwarding references P2905R2 14 18 19.40* 16.0.0*
DR20: Fix formatting of code units as integers  ( FTM ) * P2909R4 13.3 18 19.40* 16.0.0*
views::concat ( FTM ) * P2542R8 15
Concatenation of strings and string views ( FTM ) * P2591R5 15 19
Enabling list-initialization for algorithms ( FTM ) * P2248R8
P3217R0 		15
std::ranges::generate_random ( FTM ) * P1068R11
Comparisons for std::reference_wrapper , and constraints for comparisons of std::pair , std::tuple , std::optional , and std::variant ( FTM ) * ( FTM ) * P2944R3 14 19 (partial) *
Padded mdspan layouts  ( FTM ) * P2642R6
New CTAD for std::span and std::mdspan with integral constants P3029R1 19
Atomic maximum and minimum  ( FTM ) * P0493R5
std::formatter<std::filesystem::path> ( FTM ) * P2845R8
Printing Blank Lines with std::println() ( FTM ) * P3142R0 14 * 19 * 19.41* *
Undeprecate std::polymorphic_allocator::destroy P2875R4 15 19.41*
Removing deprecated strstreams P2867R2 19
Removing deprecated std::shared_ptr Atomic Access APIs P2869R4
Removing std::wstring_convert P2872R3 19
DR23: Permit an efficient implementation of std::print ( FTM ) * P3107R5
P3235R3 		19.43*
Execution control library ( FTM ) * P2300R10
P3396R0
std::inplace_vector : dynamically-resizable vector with fixed capacity  ( FTM ) * P0843R14
std::philox_engine : counter-based random number engine  ( FTM ) * P2075R6
std::optional range support  ( FTM ) * P3168R2
std::is_virtual_base_of : type trait for detecting virtual base classes  ( FTM ) * P2985R0 15 20
std::dims for std::mdspan ( FTM ) * P2389R2 19
DR11: Formal specification of the type of std::ignore P2968R2 15 19 19.42*
DR20: Removing the common reference requirement from the indirectly invocable concepts  ( FTM ) * P2997R1 15 19 19.42*
Deprecating std::is_trivial and std::is_trivial_v P3247R2 15 21
DR20: Algorithm function objects P3136R1 Yes 14 19.39* 14.0.3*
std::ranges::cache_latest_view ( FTM ) * P3138R5 15
Constraining std::expected equality operators ( FTM ) * P3379R0 15
std::aligned_accessor : an std::mdspan accessor expressing pointer over-alignment  ( FTM ) * P2897R7 21
std::is_sufficiently_aligned : checks a pointer’s alignment precondition  ( FTM ) * P2897R7 21
std::atomic_ref::address() ( FTM ) * P2835R7
DR11/20: cv-qualified types in std::atomic and std::atomic_ref P3323R1 19.44*
constexpr std::atomic and std::atomic_ref ( FTM ) * P3309R3
constexpr for specialized memory algorithms ( FTM ) * P3508R0
P3369R0 		15
<stdbit.h> and <stdckdint.h> P3370R1 15
<simd> : data-parallel types ( FTM ) * ( FTM ) * P1928R15
P3430R3
P3441R2
P3287R3
P2663R7
P2933R4
A utility for creating execution environments P3325R5
constexpr for exception types, e.g. std::bad_alloc , std::bad_cast etc.  ( FTM ) * P3068R6
P3378R2
Trivial relocatability traits and operations  ( FTM ) * P2786R13
Defang and deprecate std::memory_order::consume P3475R1
Put std::monostate in <utility> P0472R3 15 21 19.50*
std::indirect ( FTM ) * P3019R14
std::polymorphic ( FTM ) * P3019R14
More constexpr for containers and container adaptors:

std::deque , std::flat_map , std::flat_multimap , std::flat_set , std::flat_multiset , std::forward_list , std::list , std::map , std::multimap , std::queue , std::priority_queue , std::set , std::multiset , std::stack , std::unordered_map , std::unordered_multimap , std::unordered_set , and std::unordered_multiset
( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) *

P3372R3
constexpr std::inplace_vector for non-trivial types  ( FTM ) * P3074R7
std::ranges::to_input_view ( FTM ) * P3137R3 15
std::ranges::approximately_sized_range and std::ranges::reserve_hint ( FTM ) * P2846R6
<hive> : A bucket-based container that re-uses memory locations from erased elements  ( FTM ) * P0447R28
<contracts> : Contract-violation handling support  ( FTM ) * P2900R14
Standard library hardening  ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * P3471R4 15 (partial)* 19.44* (partial)*
Freestanding library: <algorithm> , <numeric> , <random> , ( <execution> , <memory> )
( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * ( FTM ) * 		P2976R1
DR20: Converting contiguous iterators to pointers P3349R0 15


C++26 feature

Paper(s)
GCC libstdc++
Clang libc++
MSVC STL
Apple Clang*

* - 将鼠标悬停在标有星号 * 的单元格上可查看附加弹窗注释。
DR nn - "DR" 后的数字 nn 表示缺陷报告所适用的目标 C++ 修订版本，例如 DR20 → C++20。

外部链接

1. C++26 - 维基百科