#ifndef _SERROR
#define _SERROR

/*
 * SError.h
 *
 *   A class with only static members for formatting semantic errors
 *   and for keeping track of whether any semantic errors occurred.
 *   Only static members means you do not need to instantiate it, but rather
 *   can use it via the scoping operator as shown below.
 *
 *   Example use of member functions:
 *  
 *     SError::reportError(cerr, nodeWithError) 
 *                              << "this is my error message" << endl;
 *
 *   It uses nodeWithError to get the line number where the error occurred.
 *   Returns the updated ostream, so you can string it together with
 *   the error message using <<, as shown above.
 *
 *
 *     bool stat = SError::hasErrors()
 *       
 *   Returns true iff reportError was ever called.     
 *
 */

#include <iostream>
using namespace std;

class TreeNode;

class SError {
 private:
  static bool errorFlag;
  SError() { }  // private so can't instantiate
 public:
  static ostream & reportError(ostream &o, TreeNode *t);
  static bool hasErrors() {
    return errorFlag;
  }
};

#endif