get value of Nullable

Author: jurgen-lentz

src/rampl.cpp

@@ -318,18 +318,11 @@ bool RAMPL::isRunning() const {
   :param string solver: The solver that will be used to solve the problem.
   :raises Error: If the underlying interpreter is not running.
 */
-void RAMPL::solve(Rcpp::Nullable<std::string> problem = R_NilValue, Rcpp::Nullable<std::string> solver = R_NilValue) {
-  if (problem.isNotNull() && solver.isNotNull())
-    _impl.solve(problem, solver);
-  else if (problem.isNotNull())
-    _impl.solve(problem, "");
-  else if (solver.isNotNull())
-    _impl.solve("", solver);
-  else
-    _impl.solve("", "");
-  
-  
-  //return _impl.solve("", ""); // FIXME: does not print to stdout with R IDE on Windows
+void RAMPL::solve(Rcpp::Nullable<std::string> problem, Rcpp::Nullable<std::string> solver) {
+  std::string cpp_problem = problem.isNotNull() ? problem.getValue() : "";
+  std::string cpp_solver = solver.isNotNull() ? solver.getValue() : "";
+    
+  _impl.solve(cpp_problem, cpp_solver);
 }