I made the following custom long double class from C++'s long double. Then, the
behavior of "echo 10" is 10, which is normal. But when I call "echo 10.uint" is
"10.0000000". It seems that the converter will be called only for uint. Why
such things occurs? I also noticed that when I import the following, it will be
error becaus $ function is duplicated.
I intend to call converter only when I call directly such as "LongDouble(10)"
and don't intend to call converter for "echo". Can I do such things?
type LongDouble* {.importcpp: "long double", nodecl .} = object
discard
proc initLongDouble*(a:SomeNumber):LongDouble {.importcpp: "(long
double)(#)", nodecl.}
converter toLongDouble*(a:SomeInteger):LongDouble = initLongDouble(a.cint)
converter toLongDouble*(a:SomeFloat):LongDouble = initLongDouble(a.cdouble)
converter toLongDouble*(a:LongDouble):LongDouble = a
proc toCDouble*(a:LongDouble):cdouble {.importcpp: "(double)(#)", nodecl.}
converter toFloat*(a:LongDouble):float = toCDouble(a).float
converter toFloat64*(a:LongDouble):float64 = toCDouble(a).float64
converter toFloat32*(a:LongDouble):float32 = toCDouble(a).float32
proc init*(T:typedesc[LongDouble], a:SomeNumber):LongDouble = LongDouble(a)
proc getString*(a:LongDouble, s:var cstring) {.header:"<string>",
importcpp: "(@) = std::to_string(#).c_str()", nodecl.}
proc `$`*(a:LongDouble):string =
var s:cstring
getString(a, s)
return $s
echo LongDouble(10) # 10.000000
echo LongDouble(10.uint) # 10.000000
echo 10 # 10
echo 10.uint # 10.000000
Run
