This one's odd. I don't think felix is expanding (1.0l / 1.0l):
#############################################
#import <flx.flxh>
typeclass Show2[T] {
virtual fun str2: T -> string;
}
gen vsprintf[t]: string * t -> string =
"flx::rtl::strutil::flx_asprintf(const_cast<char*>($1.c_str()),$T2)"
requires flx_strutil;
fun format_real (t:ldouble, precision:int) : string = {
var format = f"%%.%ig" precision;
val s = vsprintf (format, t);
return s;
}
instance Show2[ldouble] {
fun str2 (t:ldouble) : string => format_real (t, 12);
}
open Show2[ldouble];
proc p[T with Show2[T]] (t:T) {
print $ "str: " + (str2 t); endl;
}
p (1.0l / 1.0l);
#############################################
error:
foo2.cpp: In function 'void
flxusr::foo2::_init_(flxusr::foo2::thread_frame_t*)':
foo2.cpp:38: error: no match for 'operator/' in
'flx::rtl::strutil::flx_asprintf(char*, ...)(1.0e+0l) / 1.0e+0l'
compilation terminated due to -Wfatal-errors.
but if you swap everything to double and to (1.0/1.0), it works:
#############################################
#import <flx.flxh>
typeclass Show2[T] {
virtual fun str2: T -> string;
}
gen vsprintf[t]: string * t -> string =
"flx::rtl::strutil::flx_asprintf(const_cast<char*>($1.c_str()),$T2)"
requires flx_strutil;
fun format_real (t:double, precision:int) : string = {
var format = f"%%.%ig" precision;
val s = vsprintf (format, t);
return s;
}
instance Show2[double] {
fun str2 (t:double) : string => format_real (t, 12);
}
open Show2[double];
proc p[T with Show2[T]] (t:T) {
print $ "str: " + (str2 t); endl;
}
p (1.0 / 1.0);
#############################################
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