Compiler support for C++29

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Diagnostics library

Memory management library

Metaprogramming library (C++11)

General utilities library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Strings library

Text processing library

Numerics library

Date and time library

Input/output library

Filesystem library (C++17)

Concurrency support library (C++11)

Execution control library (C++26)

Technical specifications

Symbols index

External libraries

 

Compiler support

C++11

C++14

C++17

C++20

C++23

C++26

C++29

 

* - hover over a cell marked with the star * to see additional pop-up notes.
DRnn - the number nn after "DR" denotes target C++ revision the Defect Report is applied to, e.g., DR20 → C++20.

C++29 core language features

C++29 feature	Paper(s)	GCC	Clang	MSVC	Apple Clang	EDG eccp	Intel C++	Nvidia HPC C++ (ex PGI)*	Nvidia nvcc	Cray
#embed offset parameter  (FTM)*	P3540R3
Contracts for virtual functions  (FTM)*	P3097R3
Pack indexing for templates  (FTM)*	P3670R4
Designated initializers for base classes  (FTM)*	P2287R6
Deallocation functions with throwing exception specification are ill-formed	P3424R2
Conditional noexcept specifiers in compound requirements  (FTM)*	P3822R2
Defaulting postfix increment and decrement operator functions	P3668R4
Adding restrictions to defaulted assignment operator functions	P2953R5
DR26: consteval-only values  (FTM)*	P4101R1
DR23: Allowing figment and abbreviation in named universal character escapes	P3733R1
DR20: Removing mutual exclusivity for coroutine promise return functions  (FTM)*	P3950R1
DR: Adjusting identifier following new Unicode recommendations	P3658R1
DR: Explicit lambda capture is declared and initialized in lexical order	P3847R1		3.1
DR: Allowing C language linkage for templates	P2243R0
DR: Clarifying the behavior of floating-point overflow	P3899R3
DR: Non-deterministic pointer provenance	P2434R5
DR: Resolving pointer lifetime-end zap for atomic and volatile accesses	P2414R12
DR: Defining load and store operations for invalid pointers	P3347R6
C++29 feature	Paper(s)	GCC	Clang	MSVC	Apple Clang	EDG eccp	Intel C++	Nvidia HPC C++ (ex PGI)*	Nvidia nvcc	Cray

C++29 library features

C++29 feature	Paper(s)	GCC libstdc++	Clang libc++	MSVC STL	Apple Clang*
Better lookup function for map containers  (FTM)*	P3091R6
Pointer tagging  (FTM)*	P3125R6
Thread attributes  (FTM)*	P2019R9
Hazard pointer batches  (FTM)*	P3428R4
Bit permutations  (FTM)*  (FTM)*	P3104R6 P3772R2
std::shl and std::shr  (FTM)*  (FTM)*	P3793R2
std::mdspan copy and fill operations  (FTM)*	P3242R4
std::simd::iota  (FTM)*	P3319R6
std::expected::has_error()  (FTM)*	P3798R1
view_interface::at()  (FTM)*	P3052R2
std::formatter<std::error_code>	P3395R6
Fixing the default floating-point representation in std::to_chars  (FTM)*	P3505R4
Requiring std::intptr_t and std::uintptr_t	P3248R5
Deprecating signed character types in I/O streams	P3154R3
DR26: Reverting string literal support in std::constant_wrapper  (FTM)*	P4206R0	17
C++29 feature	Paper(s)	GCC libstdc++	Clang libc++	MSVC STL	Apple Clang*