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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2016-12-26 10:19:48 -08:00
parent c44dd01292
commit 7210f6e912
2 changed files with 86 additions and 4 deletions
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52
src/smt/theory_pb.h
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@ -181,6 +181,55 @@ namespace smt {
};
enum card_t {
eq_t,
le_t,
ge_t
};
struct cardinality {
literal m_lit; // literal repesenting predicate
card_t m_type;
literal_vector m_args;
unsigned m_bound;
unsigned m_watch_sum;
unsigned m_num_propagations;
unsigned m_compilation_threshold;
lbool m_compiled;
cardinality(literal l, card_t t, unsigned bound):
m_lit(l),
m_type(t),
m_bound(bound),
m_watch_sum(0),
m_num_propagations(0),
m_compilation_threshold(0),
m_compiled(0)
{}
std::ostream& display(std::ostream& out) const;
app_ref to_expr(context& ctx);
lbool assign_at_least(literal lit);
//
// lit occurs within m_bound positions
// m_bound <= m_args.size()/2
// m_lit is pos
// type at least: m_args >= m_bound
// lit occurs with opposite sign in m_args
// type at most: m_args <= m_bound
// lit occurs with same sign in m_args
// search for literal above m_bound, such that
// either lit' is positive, type = ge_t
// lit' is negative, type = le_t
// lit' is unassigned
// swap lit and lit' in watch list
// If there is a single unassigned lit', and no other to swap, perform unit propagation
// If there are no literals to swap with, then create conflict clause
//
};
struct row_info {
unsigned m_slack; // slack variable in simplex tableau
numeral m_bound; // bound
@ -216,9 +265,6 @@ namespace smt {
theory_pb_params m_params;
svector<var_info> m_var_infos;
// u_map<watch_list*> m_lwatch; // per literal.
// u_map<watch_list*> m_vwatch; // per variable.
// u_map<ineq*> m_ineqs; // per inequality.
arg_map m_ineq_rep; // Simplex: representative inequality
u_map<row_info> m_ineq_row_info; // Simplex: row information per variable
uint_set m_vars; // Simplex: 0-1 variables.