JTC 1/SC 22/WG 23 C++ Vulnerability Discussions    WG 23 N1563
		June 1 2026
		

Participants
    Stephen Michell - convenor, SCC
    Peter Sommerlad - Switzerland
    Erhard Ploedereder - liaison
    Richard Corden - Spain
 
 Regrets
    Matt Butler - USA
    Loic Joly - AFNOR
    Paul Preney - Canada

    
Actions:


Issues addressed:

       #127 Need to address synthesized and rewritten candidates in 6.21?
       	    Resolvwe and closed

       #138 6.51 preprocessor - extend with #else1 example

       #164 Unanticipated exceptions from library routines
       	    Obsolete

       #220 Add Neibold as option to prevent overload resolution with ADL
       	    Material added to 6.21 Namespace issues
	    
       #221 Merge existing material in 6.50 into 6.36
       	    work reviewed and closed

      #227 Clause 6.51 requires reconsideration
      	   Work from 11 June reviewed and accepted.
	   Closed.

Clauses addressed:

4.3 Symbol lookup and overload resolution
    Ongoing

6.21 Namespace issues
     Documented interaction of function objects and argument-dependent lookup
     
6.51 Preprocessor directives
     Reviewed, work accepted.


All work is done on GitHub in the folder for ISO-IEC-JTC1-SC22-WG23-CPP. Please contact
stephen.michell@maurya.on.ca for access.



FROM THE CHAT 2026-06-01:

2026-06-01 11:40:27 From Peter Sommerlad to Everyone:
	int main(){
	int a;
	#if defined(A)
	a = A;
	#elif defined(B)
	a = B;
	#elif1 // mis-spelled preprocessor directive
	a = 0;
	#endif
	return a; // potentially uninitialized
	}
	
2026-06-01 11:58:01 From Richard Corden to Everyone:
	The entities of a C++ program are values, objects, references, structured bindings
	(since C++17), result bindings(since C++26), functions, enumerators, types,
	class members, templates, template specializations, packs(since C++11), and namespaces.
	Preprocessor macros are not C++ entities.
	
2026-06-01 11:58:48 From Richard Corden to Everyone:
	https://en.cppreference.com/cpp/language/basic_concepts
	
2026-06-01 12:03:09 From Richard Corden to Everyone:
	https://en.cppreference.com/cpp/language/scope
	
2026-06-01 12:04:56 From Richard Corden to Everyone:
	https://eel.is/c++draft/basic.scope.scope
	
2026-06-01 12:50:29 From Richard Corden to Everyone: