From: Bonita.Montero@gmail.com   
      
   For me the following code works:   
      
            size_t n = 0;   
            n = utf8Width( string_view( "Hello, 世界!" ) );   
            printf( "%zu\n", n );   
            return 0;   
      
   But this is the templated code for the Non-AVX-version.   
   Try utf8Width256 for the AVX version and utf8Width56   
   for the AVX-512 version. Do you have any IDE like CLion ?   
      
   Am 22.11.2025 um 20:28 schrieb bart:   
   > On 22/11/2025 17:44, Bonita Montero wrote:   
   >> A lot of errors look like that you haven't enable at C++23 properly.   
   >> Can you install a current g++ ? Maybe the newest from the repository   
   >> is sufficient.   
   >>   
   >   
   > I said in a followup that I'd typed =std instead of -std, which didn't   
   > generate any error from the compiler.   
   >   
   > But I managed to compile it. However the long program with a   
   > complicated main() just crashed trying to run it, sometime before it   
   > got to the actual UTF8 bit.   
   >   
   > So I applied those headers and options to the first mm512   
   > single-function version you posted. There I only had to add std:: to   
   > those countr.one's.   
   >   
   > I used this test driver   
   >   
   >   int main() {   
   >       size_t n = 0;   
   >       n = utf8Width("Hello, 世界!" );   
   >       printf("%zu\n", n);   
   >   }   
   >   
   > And it crashes inside that function.   
   >   
   > It's all just too damn complicated, sorry. It might well be fast, but   
   > that's no good if it is troublesome to build and run for anyone else.   
   >   
   > Another factor is this: each build, even at -O0, takes 3 whole seconds   
   > on my machine. That must be a huge pile of junk it is including.   
   >   
   > Building my C version takes some 1/20th of a second (even gcc takes   
   > only 0.3 seconds).   
   >   
      
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