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Refactor theory_seq::find_fst_non_empty_var to use std::optional (#8315)

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* Initial plan

* Refactor find_fst_non_empty_var to use std::optional

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

* Use value_or() for more idiomatic std::optional usage

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
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Copilot 2026-01-24 09:38:20 -08:00 • committed by GitHub
parent c2d996574f
commit 39b9038449
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2 changed files with 9 additions and 6 deletions
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12
src/smt/seq_eq_solver.cpp
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@ -1216,9 +1216,11 @@ bool theory_seq::find_better_rep(expr_ref_vector const& ls, expr_ref_vector cons
if (ls.empty() || rs.empty())
return false;
expr* l_fst = find_fst_non_empty_var(ls);
expr* r_fst = find_fst_non_empty_var(rs);
if (!r_fst) return false;
auto opt_l_fst = find_fst_non_empty_var(ls);
auto opt_r_fst = find_fst_non_empty_var(rs);
if (!opt_r_fst) return false;
expr* l_fst = opt_l_fst.value_or(nullptr);
expr* r_fst = *opt_r_fst;
expr_ref len_r_fst = mk_len(r_fst);
expr_ref len_l_fst(m);
enode * root2;
@ -1303,11 +1305,11 @@ int theory_seq::find_fst_non_empty_idx(expr_ref_vector const& xs) {
return -1;
}
expr* theory_seq::find_fst_non_empty_var(expr_ref_vector const& x) {
std::optional<expr*> theory_seq::find_fst_non_empty_var(expr_ref_vector const& x) {
int i = find_fst_non_empty_idx(x);
if (i >= 0)
return x[i];
return nullptr;
return std::nullopt;
}
#endif