1 files changed, 42 insertions, 0 deletions
diff --git a/vendor/varisat/src/state.rs b/vendor/varisat/src/state.rs
new file mode 100644
index 000000000..4fb636e66
--- /dev/null
+++ b/vendor/varisat/src/state.rs
@@ -0,0 +1,42 @@
+//! Miscellaneous solver state.
+use crate::solver::SolverError;
+
+/// Satisfiability state.
+#[derive(Copy, Clone, Eq, PartialEq, Debug)]
+pub enum SatState {
+    Unknown,
+    Sat,
+    Unsat,
+    UnsatUnderAssumptions,
+}
+
+impl Default for SatState {
+    fn default() -> SatState {
+        SatState::Unknown
+    }
+}
+
+/// Miscellaneous solver state.
+///
+/// Anything larger or any larger group of related state variables should be moved into a separate
+/// part of [`Context`](crate::context::Context).
+pub struct SolverState {
+    pub sat_state: SatState,
+    pub formula_is_empty: bool,
+    /// Whether solve was called at least once.
+    pub solver_invoked: bool,
+    pub state_is_invalid: bool,
+    pub solver_error: Option<SolverError>,
+}
+
+impl Default for SolverState {
+    fn default() -> SolverState {
+        SolverState {
+            sat_state: SatState::Unknown,
+            formula_is_empty: true,
+            solver_invoked: false,
+            state_is_invalid: false,
+            solver_error: None,
+        }
+    }
+}