this used work for me, after upgrade I get this error. how to fix it ?

import std.traits;
        enum LogLevel : ubyte {
                INFO = 0,
                WARN,
                ERROR,
                FATAL,
        }


extern (C) string VFORMAT(LogLevel level, string file, size_t line, char[] tmp, bool line_break, string tag, string fmt, ...) @nogc nothrow {
        return null;
}

template asPure(string P, alias Fn) if (isFunctionPointer!(typeof(&Fn))) {
        enum N = __traits(identifier, Fn);
        enum string asPure = "private alias " ~ N ~ "_PURE = " ~ typeof(&Fn).stringof ~ " pure;\n" ~ "__gshared immutable " ~ N ~ "_PURE " ~ P ~"= cast(" ~ N ~ "_PURE) &" ~ N ~ " ;" ;
}
enum xx = asPure!("VFORMATP", VFORMAT);
mixin(xx);

void main(){

}

 reinterpreting cast from `nothrow @nogc extern (C) string(LogLevel level, string file, ulong line, char[] tmp, bool line_break, string tag, string fmt, ...)*` to `pure nothrow @nogc extern (C) string(LogLevel, string, ulong, char[], bool, string, string, ...)*` is not supported in CTFE

On Monday, 14 June 2021 at 13:31:51 UTC, baby_tiger wrote:

It seems to not work at runtime either. Maybe they've made this behaviour illegal now? Hopefully someone answers.

import std.traits;
import core.stdc.stdarg;
        enum LogLevel : ubyte {
                INFO = 0,
                WARN,
                ERROR,
                FATAL,
        }


extern (C) string VFORMAT(LogLevel level, string file, size_t line, char[] tmp, bool line_break, string tag, string fmt, ...) @nogc nothrow {
        return null;
}

extern (C) string function(LogLevel level, string file, size_t line, char[] tmp, bool line_break, string tag, string fmt, ...) @nogc nothrow pure fp;
void main(){
    fp = &VFORMAT; //fails
}

this used work for me, after upgrade I get this error. how to fix it ?

import std.traits;
        enum LogLevel : ubyte {
                INFO = 0,
                WARN,
                ERROR,
                FATAL,
        }


extern (C) string VFORMAT(LogLevel level, string file, size_t line, char[] tmp, bool line_break, string tag, string fmt, ...) @nogc nothrow {
        return null;
}

template asPure(string P, alias Fn) if (isFunctionPointer!(typeof(&Fn))) {
        enum N = __traits(identifier, Fn);
        enum string asPure = "private alias " ~ N ~ "_PURE = " ~ typeof(&Fn).stringof ~ " pure;\n" ~ "__gshared immutable " ~ N ~ "_PURE " ~ P ~"= cast(" ~ N ~ "_PURE) &" ~ N ~ " ;" ;
}
enum xx = asPure!("VFORMATP", VFORMAT);
mixin(xx);

void main(){

}

 reinterpreting cast from `nothrow @nogc extern (C) string(LogLevel level, string file, ulong line, char[] tmp, bool line_break, string tag, string fmt, ...)*` to `pure nothrow @nogc extern (C) string(LogLevel, string, ulong, char[], bool, string, string, ...)*` is not supported in CTFE

On Monday, 2 August 2021 at 11:28:46 UTC, Tejas wrote:

Try this:

void main(){
    fp = cast(typeof(fp))&VFORMAT; //fails
}