46 lines
907 B
Prolog
46 lines
907 B
Prolog
/**
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@file bootutils.yap
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@short utilities
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@addtogroup Internal_Database
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@{
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*/
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/** @pred recordaifnot(+ _K_, _T_,- _R_)
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If a term equal to _T_ up to variable renaming is stored under key
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_K_ fail. Otherwise, make term _T_ the first record under key
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_K_ and unify _R_ with its reference.
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*/
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recordaifnot(K,T,R) :-
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recorded(K,T,R), % force non-det binding to R.
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'$still_variant'(R,T),
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!,
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fail.
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recordaifnot(K,T,R) :-
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recorda(K,T,R).
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/** @pred recordzifnot(+ _K_, _T_,- _R_)
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If a term equal to _T_ up to variable renaming is stored under key
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_K_ fail. Otherwise, make term _T_ the first record under key
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_K_ and unify _R_ with its reference.
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This predicate is YAP specific.
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*/
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recordzifnot(K,T,R) :-
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recorded(K,T,R),
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'$still_variant'(R,T),
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!,
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fail.
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recordzifnot(K,T,R) :-
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recordz(K,T,R).
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%% @}
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