This article lists some of the major changes to docs for Visual Studio version 16.8.

For information about what's new in Visual Studio, see What's new for C++ in Visual Studio.

For the latest C and C++ conformance status, see C++ conformance improvements in Visual Studio

• _Noreturn keyword and noreturn macro (C11)
• _Static_assert keyword and static_assert macro (C11)

• Parsing C Command-Line Arguments - Document exceptions to the rules for parsing C arguments
• Type Qualifiers - Added restrict
• C Assignment Operators - Lexical grammar update for C17
• C Keywords - Lexical grammar update for C17
• C Lexical grammar - Lexical grammar update for C17
• Summary of Declarations - Lexical grammar update for C17
• Summary of Expressions - Lexical grammar update for C17
• C enumeration declarations - Fixed lexical grammar
• Summary of C statements - Updated for __leave, __try keywords

• Type-generic math

• qsort - Added note about stability
• _cwait - Fixed code example
• Function family overview - Added operator new and delete
• round, roundf, roundl - Clarified rounding code example
• Compatibility - Added C99 conformance notes
• realloc - Added C99 conformance notes
• CRT Library Features - Added C99 conformance notes
• assert Macro, _assert, _wassert - Clarified assert behavior
• vsnprintf_s, _vsnprintf_s, _vsnprintf_s_l, _vsnwprintf_s, _vsnwprintf_s_l - Clarified return values
• setlocale, _wsetlocale - Added C Runtime UTF-8 support info

• Predefined macros - Updated to 16.8 release notes, C11/C17 /std support and SDK install docs
• MSVC new preprocessor overview - Updated preprocessor content

• C33001 - VC Code Analysis - add for new rules in 16.8
• C33004 - VC Code Analysis - add for new rules in 16.8
• C33005 - VC Code Analysis - add for new rules in 16.8
• C33010 - VC Code Analysis - add for new rules in 16.8
• C33011 - VC Code Analysis - add for new rules in 16.8
• C33020 - VC Code Analysis - add for new rules in 16.8
• C33022 - VC Code Analysis - add for new rules in 16.8

• C6262 - Address cpp-docs.zh-tw issue 20
• C26497 USE_CONSTEXPR_FOR_FUNCTION - Added example to C26497
• C26496 USE_CONST_FOR_VARIABLE - Added example to C26496
• C26495 MEMBER_UNINIT - Updated examples and links in C26495
• C26483 STATIC_INDEX_OUT_OF_RANGE - Added example to C26483
• C26462 USE_CONST_POINTER_FOR_VARIABLE - Added description and example to C26462
• C26461 USE_CONST_POINTER_ARGUMENTS: - Added description and example to C26461
• C26460 USE_CONST_REFERENCE_ARGUMENTS - Added description and example to C26460
• C26440 DECLARE_NOEXCEPT - Added example and link to Core Guidelines for C26440
• C26439 SPECIAL_NOEXCEPT - Added example and link to Core Guidelines for C26439
• C26436 NEED_VIRTUAL_DTOR - Added example and Core Guidelines link to C26436
• C26408 NO_MALLOC_FREE - Added example and Core Guidelines link to C26408
• C26401 DONT_DELETE_NON_OWNER - Added example and Core Guidelines link to C26401
• C26494 VAR_USE_BEFORE_INIT - Added example to C26494
• C26493 NO_CSTYLE_CAST - Added example to C26493
• C26492 NO_CONST_CAST - Added example to C26492
• C26490 NO_REINTERPRET_CAST - Added example to C26490
• C26482 NO_DYNAMIC_ARRAY_INDEXING - Added example to C26482
• C26471 NO_REINTERPRET_CAST_FROM_VOID_PTR - Added Example to C26471
• C26466 NO_STATIC_DOWNCAST_POLYMORPHIC - Added Example to C26466
• C26465 NO_CONST_CAST_UNNECESSARY - Added example to C26465
• C26447 DONT_THROW_IN_NOEXCEPT - Adding example to C26447
• C26446 USE_GSL_AT - Added an example for C26446
• C26434 DONT_HIDE_METHODS - Added example for C26434
• C26432 DEFINE_OR_DELETE_SPECIAL_OPS - Added example for C26432
• C26402 DONT_HEAP_ALLOCATE_MOVABLE_RESULT - Added example for C26402
• C26409 NO_NEW_DELETE - Added example for C26409
• C26474 NO_IMPLICIT_CAST - Updated C26474 to clarify base/derived cases

• Configure a Linux CMake project in Visual Studio

• Create a Linux MSBuild C++ project in Visual Studio - Updated instructions to create a Linux project
• ConnectionManager reference - Added commands for modify, clean
• Configure a Linux CMake project in Visual Studio - Updated to reflect latest UI
• Deploy, run, and debug your Linux MSBuild project - Added GDB Path

• Compiler Warning (level 4) C4388 - Added warning C4388, updated 16.7 warnings

• Compiler Warning (level 3) C4018 - Updated 16.7 warnings
• Compiler Warning (level 4) C4389 - Updated 16.7 warnings
• Compiler Warnings by compiler version - Updated 16.7 warnings
• Compiler warnings C4800 through C5999 - Updated 16.7 warnings
• Compiler Error C3381 - Address cpp-docs 2493; update remarks and example

• C++ conformance improvements in Visual Studio - Updated to 16.8 release notes
• Microsoft C/C++ help and community - Updated DevCom and Microsoft Docs Q&A links
• C++ in Visual Studio - Updated DevCom and Microsoft Docs Q&A links
• Microsoft C/C++ language conformance - Updated C++20 library conformance table, update language feature table for 16.7

• __restrict
• if-else statement (C++) - Added description for if/else grammar
• union - Fixed code snippet

• .vcxproj files and wildcards
• /headerUnit (Use header unit IFC)
• /module:exportHeader (Create header units)
• /module:reference (Use named module IFC)
• /translateInclude (Translate include directives into import directives)
• /Zc:preprocessor (Enable preprocessor conformance mode)

• /permissive- (Standards conformance) - Updated to 16.8 release notes
• /clr (Common Language Runtime Compilation) - Added description for /clr
• pgosweep - Added more pgosweep options
• Importing data using __declspec(dllimport) - Updated example

• How to: Use existing C++ code in a Universal Windows Platform app - Reworked for clarity and updated examples

• <bit>
• <bit> functions
• endian enum

• <ios> typedefs - Updated example per GitHub #2514
• basic_string Class - Added _starts_with(), ends_with()
• ios_base Class
• map class
• multimap Class - Added contains()
• multiset Class - Added contains()
• set Class - Added contains()
• unordered_map Class - Added contains()
• unordered_multimap Class - Added contains()
• unordered_multiset Class - Added contains()
• unordered_set Class - Added contains()
• basic_string_view Class - added starts_with(), ends_with()
• <bit> functions - Updated nodiscard syntax

The following people contributed to the C++, C, and Assembler docs during this period. Thank you! See Microsoft Docs contributor guide overview if you'd like to learn how to contribute.

• yecril71pl - Christopher Yeleighton (4)
• definedrisk - Ben (3)
• BeardedFish - Darian B. (1)
• codevenkat (1)
• eltociear - Ikko Ashimine (1)
• fsb4000 - Igor Zhukov (1)
• Jaiganeshkumaran - Jaiganesh Kumaran (1)
• jogo- (1)
• justanotheranonymoususer (1)
• matrohin - Dmitry Matrokhin (1)
• mhemmit (1)
• MSDN-WhiteKnight - MSDN.WhiteKnight (1)
• OdinTemple - Odin Temple (1)
• r00tdr4g0n - r00tdr4g0n (1)
• sebkraemer - Sebastian Krämer (1)
• vtjnash - Jameson Nash (1)
• Youssef1313 - Youssef Victor (1)
• zecozephyr - Jonathan Bailey (1)