My problem is that I'm trying to make my own datatype, but I can not use ints in the naming convention of the items that are appart of the datatype
datatype psu = 350w | 450w | 550w | ... etc;
error thrown:
stdIn:16.15-16.30 Error: syntax error: deleting STRING BAR STRING
Is there some way I can convert these numbers into a string that would be acceptable for the sml interpreter? I really don't want to name my variable "three hundred and fifty watts" or anything.
I tried looking up a toString and just making the variables explicitly strings, but I could not find a helpful toString and making the variables strings just threw another error
As noted in comments, identifiers in SML (as in many other programming languages) cannot begin with digits.
datatype psu = W350 | W450 | W550 | ...
This would work.
Something like the following would also work, but does not let you constrain the possibilities.
datatype psu = Watts of int
Similarly, if you represent that value as a string like "350W" you cannot ensure at compile-time that the value held in that string is in a particular set of options.