laerror use std::exception

laerror.h

@@ -33,7 +33,7 @@ extern  bool _LA_count_check; //intentionally not const
 
 
 //exception class for laerror
-class LAerror
+class LAerror : public std::exception
 	{
 	public:
 	const char *msg;

t.cc

@@ -2726,6 +2726,7 @@ cout <<"nonpseudounitarity of explicit uubar = "<<uubartest2c.norm(1.)<<endl;
 
 if(1)
 {
+laerror("test exception");
 }