25 lines
840 B
Text
25 lines
840 B
Text
open tactic
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meta def list_name.to_expr (n : list name) : tactic expr := to_expr (quote n)
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@[user_attribute]
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meta def my_attr : caching_user_attribute (name → bool) :=
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{ name := "my_attr",
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descr := "my attr",
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mk_cache := λ ls, do {
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els ← list_name.to_expr ls,
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c ← to_expr `(λ n : name, (name.cases_on n ff (λ _ _, to_bool (n ∈ %%els)) (λ _ _, ff) : bool)),
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eval_expr (name → bool) c
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},
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dependencies := []
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}
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meta def my_tac : tactic unit :=
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do f ← caching_user_attribute.get_cache my_attr,
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trace (f `foo),
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return ()
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@[my_attr] def bla := 10
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run_cmd my_tac
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@[my_attr] def foo := 10 -- Cache was invalided
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run_cmd my_tac -- Add closure to the cache containing auxiliary function created by eval_expr
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run_cmd my_tac -- Cache should be flushed since the auxiliary function is gone
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