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fix #1828, add self-contained utility to extract arithmetical values for use in theory_seq and theory_str and other theories that access current values assigned to numeric variables

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-09-16 13:31:37 -07:00
parent 2b35f1a924
commit 286126dde9
4 changed files with 139 additions and 2 deletions
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4
src/smt/theory_seq.cpp
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@ -4588,10 +4588,10 @@ bool theory_seq::lower_bound2(expr* _e, rational& lo) {
theory_mi_arith* tha = get_th_arith<theory_mi_arith>(ctx, m_autil.get_family_id(), e);
if (!tha) {
theory_i_arith* thi = get_th_arith<theory_i_arith>(ctx, m_autil.get_family_id(), e);
if (!thi || !thi->get_lower(ctx.get_enode(e), _lo)) return false;
if (!thi || !thi->get_lower(ctx.get_enode(e), _lo) || !m_autil.is_numeral(_lo, lo)) return false;
}
enode *ee = ctx.get_enode(e);
if (!tha->get_lower(ee, _lo) || m_autil.is_numeral(_lo, lo)) {
if (tha && (!tha->get_lower(ee, _lo) || m_autil.is_numeral(_lo, lo))) {
enode *next = ee->get_next();
bool flag = false;
while (next != ee) {