rishi/scryer-prolog
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This commit is contained in:
Adrián Arroyo Calle
2022-12-21 22:32:36 +01:00
parent f2d041ea23
commit 21e4347b3e
1 changed files with 7 additions and 6 deletions
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13
src/lib/builtins.pl
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@@ -38,18 +38,18 @@ internal settings and basic I/O are all here.
%% =(?X, ?Y) %% =(?X, ?Y)
% %
% Unify two variables. This is the most basic operation of Prolog. % True if X and Y can be unified. This is the most basic operation of Prolog.
% Unification also happens when doing head matching in a rule. % Unification also happens when doing head matching in a rule.
X = X. X = X.
%% true. %% true.
% %
% Always succeeds % Always true.
true. true.
%% false. %% false.
% %
% Always fails % Always false.
false :- '$fail'. false :- '$fail'.
@@ -119,8 +119,9 @@ call(_, _, _, _, _, _, _, _, _).
%% current_prolog_flag(Flag, Value) %% current_prolog_flag(Flag, Value)
% %
% Returns the current Value of several flags in the running system. A flag is a setting which value affects % True iff Flag is a flag supported by the processor, and Value is the value currently associated with it.
% internal operation of the Prolog system. Some flags are read-only, while others can be set with set\_prolog\_flag/2. % A flag is a setting which value affects internal operation of the Prolog system. Some flags are read-only,
% while others can be set with set\_prolog\_flag/2.
% %
% The flags that Scryer Prolog support are: % The flags that Scryer Prolog support are:
% * `max\_arity`: The max arity a predicate can have in Prolog. On Scryer is set to 1023. Read only. % * `max\_arity`: The max arity a predicate can have in Prolog. On Scryer is set to 1023. Read only.
@@ -163,7 +164,7 @@ current_prolog_flag(Flag, _) :-
%% set_prolog_flag(Flag, Value). %% set_prolog_flag(Flag, Value).
% %
% Changes the internal value of the flag. To see the list of flags supported by Scryer Prolog, % Sets the internal value of the flag. To see the list of flags supported by Scryer Prolog,
% check current\_prolog\_flag/2. The flags that are read only will fail if you try to change their values % check current\_prolog\_flag/2. The flags that are read only will fail if you try to change their values
set_prolog_flag(Flag, Value) :- set_prolog_flag(Flag, Value) :-
(var(Flag) ; var(Value)), (var(Flag) ; var(Value)),