Improve error message

src/driver/argument_parser.hpp

@@ -81,6 +81,32 @@ inline std::ostream& operator<<(std::ostream& os, const color& c)
     return os;
 }
 
+template <class T>
+struct type_name
+{
+    static const std::string& apply() { return migraphx::get_type_name<T>(); }
+};
+
+template <>
+struct type_name<std::string>
+{
+    static const std::string& apply()
+    {
+        static const std::string name = "std::string";
+        return name;
+    }
+};
+
+template <class T>
+struct type_name<std::vector<T>>
+{
+    static const std::string& apply()
+    {
+        static const std::string name = "std::vector<" + type_name<T>::apply() + ">";
+        return name;
+    }
+};
+
 template <class T>
 struct value_parser
 {
@@ -92,7 +118,7 @@ struct value_parser
         ss.str(x);
         ss >> result;
         if(ss.fail())
-            throw std::runtime_error("Failed to parse: " + x);
+            throw std::runtime_error("Failed to parse '" + x + "' as " + type_name<T>::apply());
         return result;
     }
 
@@ -104,7 +130,7 @@ struct value_parser
         ss.str(x);
         ss >> i;
         if(ss.fail())
-            throw std::runtime_error("Failed to parse: " + x);
+            throw std::runtime_error("Failed to parse '" + x + "' as " + type_name<T>::apply());
         return static_cast<T>(i);
     }
 
@@ -118,31 +144,6 @@ struct value_parser
     }
 };
 
-template <class T>
-struct type_name
-{
-    static const std::string& apply() { return migraphx::get_type_name<T>(); }
-};
-
-template <>
-struct type_name<std::string>
-{
-    static const std::string& apply()
-    {
-        static const std::string name = "std::string";
-        return name;
-    }
-};
-
-template <class T>
-struct type_name<std::vector<T>>
-{
-    static const std::string& apply()
-    {
-        static const std::string name = "std::vector<" + type_name<T>::apply() + ">";
-        return name;
-    }
-};
 
 struct argument_parser
 {