Re: Results of survey re. a new array size operator

On 29/01/2025 17:00, Ben Bacarisse wrote:

Alexis <flexibeast@gmail.com> writes:
 

JeanHeyd Meneide, a Project Editor for WG14, has just posted the results
of a survey re. the preferred form of a new array size operator:
>
-- https://thephd.dev/the-big-array-size-survey-for-c-results

 Curious.  The top objection to the usual macro solution is given as:
    * double-evaluation of e.g. getting the size of the 1-d part of a 2-d
     array int meow[3][4]; /* ... */ SIZE_KEYWORD(meow[first_idx()]);
 Does the author not know that there is no evaluation of the operands of
sizeof in this example?
 

6.5.3.4p2 :
"""
If the type of the operand is a variable length array type, the operand is evaluated; otherwise, the operand is not evaluated and the result is an integer constant.
"""
I don't know if that is the source of the double-evaluation concern here, but it is certainly a situation in which sizeof /does/ evaluate its operand.

His "About" pages says "Project Editor for ISO/IEC JTC1 SC22 WG14 -
Programming Languages, C".