On Monday, 14 June 2021 at 13:31:51 UTC, baby_tiger wrote:
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
It seems to not work at runtime either. Maybe they've made this
behaviour illegal now? Hopefully someone answers.
```d
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
}
```
