From: Bonita.Montero@gmail.com
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.
Am 22.11.2025 um 18:35 schrieb bart:
> On 22/11/2025 17:13, Bonita Montero wrote:
>> You can compile the code with -mavx512bw.
>> This is "inline.h":
>
> But I now get, from:
>
> Â g++ =std=c++23 -mavx512bw -O2 c.cpp
>
> the errors shown below. I tried -fconcepts too.
>
> So, what also do I need? (So far you're not selling C++ very well!)
>
> ---------------------------------
>
> c.cpp:33:54: warning: use of C++23 'make_signed_t' integer
> constant
> Â Â 33 |Â Â Â Â Â Â Â Â Â Â Â Â if( (*it & 0xC0) == 0x80 || width > min(
4Z, rem )
> ) [[unlikely]]
> Â Â Â Â Â |Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
                           ^~
> c.cpp:24:5: error: 'requires' does not name a type
> Â Â 24 |Â Â Â Â requires std::same_as ||
> std::same_as
> Â Â Â Â Â |Â Â Â Â ^~~~~~~~
> c.cpp:24:5: note: 'requires' only available with '-std=c++20' or
> '-fconcepts'
> c.cpp: In function 'size_t utf8widthC(const char*)':
> c.cpp:52:10: error: 'char8_t' was not declared in this scope; did you
> mean 'wchar_t'?
> Â Â 52 |Â Â Â Â for( char8_t c; (c = *str); ++length )
> Â Â Â Â Â |Â Â Â Â Â Â Â Â Â ^~~~~~~
> Â Â Â Â Â |Â Â Â Â Â Â Â Â Â wchar_t
> c.cpp:52:22: error: 'c' was not declared in this scope
> Â Â 52 |Â Â Â Â for( char8_t c; (c = *str); ++length )
> Â Â Â Â Â |Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ^
> c.cpp: In function 'size_t utf8Width512(const char*)':
> c.cpp:99:21: error: 'countr_one' was not declared in this scope
> Â Â 99 |Â Â Â Â unsigned ones = countr_one( nzMask );
> Â Â Â Â Â |Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ^~~~~~~~~~
> c.cpp: In function 'size_t utf8Width256(const char*)':
> c.cpp:150:21: error: 'countr_one' was not declared in this scope
> Â 150 |Â Â Â Â unsigned ones = countr_one( nzMask );
> Â Â Â Â Â |Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ^~~~~~~~~~
> c.cpp: In function 'int main()':
> c.cpp:192:5: error: 'span' was not declared in this scope
> Â 192 |Â Â Â Â span ranges( rawRanges );
> Â Â Â Â Â |Â Â Â Â ^~~~
> c.cpp:192:5: note: 'std::span' is only available from C++20 onwards
> c.cpp:193:5: error: 'char8_t' was not declared in this scope; did you
> mean 'wchar_t'?
> Â 193 |Â Â Â Â char8_t rawTypeHeads[4] { 0, 0xC0, 0xE0, 0xF0 };
> Â Â Â Â Â |Â Â Â Â ^~~~~~~
> Â Â Â Â Â |Â Â Â Â wchar_t
> c.cpp:194:9: error: expected ';' before 'typeHeads'
> Â 194 |Â Â Â Â span typeHeads( rawTypeHeads );
> Â Â Â Â Â |Â Â Â Â Â Â Â Â ^~~~~~~~~~
> Â Â Â Â Â |Â Â Â Â Â Â Â Â ;
> c.cpp:196:5: error: 'u8string' was not declared in this scope
> Â 196 |Â Â Â Â u8string u8Str( BUF_MIN + 3, (char8_t)0 );
> Â Â Â Â Â |Â Â Â Â ^~~~~~~~
> c.cpp:196:5: note: 'std::u8string' is only available from C++20 onwards
> c.cpp:197:20: error: 'u8string' does not name a type
> Â 197 |Â Â Â Â using u8s_it = u8string::iterator;
> Â Â Â Â Â |Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ^~~~~~~~
> c.cpp:198:5: error: 'u8s_it' was not declared in this scope
> Â 198 |Â Â Â Â u8s_it
> Â Â Â Â Â |Â Â Â Â ^~~~~~
> c.cpp:201:30: error: 'itChar' was not declared in this scope
> Â 201 |Â Â Â Â for( size_t width, type; itChar < itCharEnd; itChar +=
> width )
> Â Â Â Â Â |Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ^~~~~~
> c.cpp:201:39: error: 'itCharEnd' was not declared in this scope
> Â 201 |Â Â Â Â for( size_t width, type; itChar < itCharEnd; itChar +=
> width )
> Â Â Â Â Â |Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
            ^~~~~~~~~
> c.cpp:205:23: error: 'ranges' was not declared in this scope; did you
> mean 'rawRanges'?
> Â 205 |Â Â Â Â Â Â Â Â char32_t c = (ranges[type])( mt );
> Â Â Â Â Â |Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ^~~~~~
> Â Â Â Â Â |Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â rawRanges
> c.cpp:206:20: error: expected ';' before 'itTail'
> Â 206 |Â Â Â Â Â Â Â Â for( u8s_it itTail = itChar + width; --itTail >
> itChar; c >>= 6 )
> Â Â Â Â Â |Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ^~~~~~~
> Â Â Â Â Â |Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ;
> c.cpp:206:48: error: 'itTail' was not declared in this scope
> Â 206 |Â Â Â Â Â Â Â Â for( u8s_it itTail = itChar + width; --itTail >
> itChar; c >>= 6 )
> Â Â Â Â Â |Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
                     ^~~~~~
> c.cpp:208:19: error: 'typeHeads' was not declared in this scope
> Â 208 |Â Â Â Â Â Â Â Â *itChar = typeHeads[type] | (char8_t)c;
> Â Â Â Â Â |Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ^~~~~~~~~
> c.cpp:210:5: error: 'u8Str' was not declared in this scope
> Â 210 |Â Â Â Â u8Str.resize( itChar - u8Str.begin() );
> Â Â Â Â Â |Â Â Â Â ^~~~~
> c.cpp:210:19: error: 'itChar' was not declared in this scope
> Â 210 |Â Â Â Â u8Str.resize( itChar - u8Str.begin() );
> Â Â Â Â Â |Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ^~~~~~
> c.cpp:228:25: error: 'u8string' is not a type
> Â 228 |Â Â Â Â bench( "my: ", [&]( u8string const &str ) { total +=
> utf8Width256( (char *)str.c_str() ); } );
> Â Â Â Â Â |Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ^~~~~~~~
> c.cpp: In lambda function:
> c.cpp:228:84: error: request for member 'c_str' in 'str', which is of
> non-class type 'const int'
> Â 228 |Â Â Â Â bench( "my: ", [&]( u8string const &str ) { total +=
> utf8Width256( (char *)str.c_str() ); } );
> Â Â Â Â Â | Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ^~~~~
> c.cpp: In function 'int main()':
> c.cpp:229:27: error: 'u8string' is not a type
> Â 229 |Â Â Â Â bench( "nerd: ", [&]( u8string const &str ) { total +=
> utf8widthC( (char *)str.c_str() ); } );
> Â Â Â Â Â |Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ^~~~~~~~
> c.cpp: In lambda function:
> c.cpp:229:84: error: request for member 'c_str' in 'str', which is of
> non-class type 'const int'
> Â 229 |Â Â Â Â bench( "nerd: ", [&]( u8string const &str ) { total +=
> utf8widthC( (char *)str.c_str() ); } );
> Â Â Â Â Â | Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ^~~~~
>
>
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