rishi/scryer-prolog
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ADDED: must_be/can_be(not_less_than_zero, ...)

Browse Source 
See #1309.
This commit is contained in:
Markus Triska
2022-08-24 21:05:44 +02:00
committed by Mark Thom
parent abca5fc405
commit 5b324680ba
1 changed files with 13 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
src/lib/error.pl
View File

@@ -52,6 +52,11 @@ must_be_(var, Term) :-
; throw(error(uninstantiation_error(Term), must_be/2))
).
must_be_(integer, Term) :- check_(integer, integer, Term).
must_be_(not_less_than_zero, N) :-
must_be(integer, N),
( N >= 0 -> true
; domain_error(not_less_than_zero, N, must_be/2)
).
must_be_(atom, Term) :- check_(atom, atom, Term).
must_be_(character, T) :- check_(error:character, character, T).
must_be_(in_character, T) :- check_(error:in_character, in_character, T).
@@ -135,6 +140,7 @@ type(list).
type(var).
type(boolean).
type(term).
type(not_less_than_zero).
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
can_be(Type, Term)
@@ -158,6 +164,13 @@ can_be(Type, Term) :-
).
can_(integer, Term) :- integer(Term).
can_(not_less_than_zero, N) :-
( integer(N) ->
( N >= 0 -> true
; domain_error(not_less_than_zero, N, can_be/2)
)
; type_error(integer, N, can_be/2)
).
can_(atom, Term) :- atom(Term).
can_(character, T) :- character(T).
can_(in_character, T) :- in_character(T).