Bump microlp

Cargo.toml

@@ -38,7 +38,7 @@ minilp = [
 
 [dependencies]
 coin_cbc = { version = "0.1", optional = true, default-features = false }
-microlp = { version = "0.2.11", optional = true }
+microlp = { version = "0.3.1", optional = true }
 lpsolve = { version = "1.0.1", optional = true }
 highs = { version = "2.0.0", optional = true }
 russcip = { version = "0.9.1", optional = true }

src/solvers/microlp.rs

@@ -102,6 +102,7 @@ impl From<microlp::Error> for ResolutionError {
             microlp::Error::Unbounded => Self::Unbounded,
             microlp::Error::Infeasible => Self::Infeasible,
             microlp::Error::InternalError(s) => Self::Str(s),
+            microlp::Error::Limit => Self::Str("Execution Limit reached".to_string()),
         }
     }
 }
@@ -124,7 +125,7 @@ impl Solution for MicroLpSolution {
         SolutionStatus::Optimal
     }
     fn value(&self, variable: Variable) -> f64 {
-        self.solution[self.variables[variable.index()]]
+        self.solution.var_value(self.variables[variable.index()])
     }
 }