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add nullable, get-head-tail with Caleb

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
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Nikolaj Bjorner 2020-05-18 19:10:00 -07:00
parent c40c4313a4
commit f8d328b1fb
3 changed files with 78 additions and 0 deletions
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3
src/ast/rewriter/seq_rewriter.h
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@ -132,6 +132,9 @@ class seq_rewriter {
}
length_comparison compare_lengths(unsigned sza, expr* const* as, unsigned szb, expr* const* bs);
bool get_head_tail(expr* e, expr_ref& head, expr_ref& tail);
expr_ref is_nullable(expr* r);
br_status mk_seq_unit(expr* e, expr_ref& result);
br_status mk_seq_concat(expr* a, expr* b, expr_ref& result);
br_status mk_seq_length(expr* a, expr_ref& result);