Add _reset to call GRBreset for Gurobi

Author: metab0t

include/pyoptinterface/gurobi_model.hpp

@@ -15,6 +15,7 @@
 #define APILIST               \
 	B(GRBnewmodel);           \
 	B(GRBfreemodel);          \
+	B(GRBreset);              \
 	B(GRBgetenv);             \
 	B(GRBwrite);              \
 	B(GRBaddvar);             \
@@ -150,6 +151,8 @@ class GurobiModel : public OnesideLinearConstraintMixin<GurobiModel>,
 	void init(const GurobiEnv &env);
 	void close();
 
+	void _reset(int clearall);
+
 	double get_infinity() const;
 
 	void write(const std::string &filename);

lib/gurobi_model.cpp

@@ -187,6 +187,12 @@ void GurobiModel::close()
 	m_model.reset();
 }
 
+void GurobiModel::_reset(int clearall)
+{
+	int error = gurobi::GRBreset(m_model.get(), clearall);
+	check_error(error);
+}
+
 double GurobiModel::get_infinity() const
 {
 	return GRB_INFINITY;

lib/gurobi_model_ext.cpp

@@ -42,6 +42,7 @@ NB_MODULE(gurobi_model_ext, m)
 		BIND_F(close)
 		BIND_F(write)
 	    // clang-format on
+	    .def("_reset", &GurobiModel::_reset, nb::arg("clearall") = 0)
 
 	    .def("add_variable", &GurobiModel::add_variable,
 	         nb::arg("domain") = VariableDomain::Continuous, nb::arg("lb") = -GRB_INFINITY,