[PATCH v2 06/19] qapi/schema: make c_type() and json_type() abstract methods

[John Snow <jsnow@redhat.com>]

These methods should always return a str, it's only the default abstract
implementation that doesn't. They can be marked "abstract", which
requires subclasses to override the method with the proper return type.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 scripts/qapi/schema.py | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/scripts/qapi/schema.py b/scripts/qapi/schema.py
index e45d9545eda..8e25dd35562 100644
--- a/scripts/qapi/schema.py
+++ b/scripts/qapi/schema.py
@@ -16,6 +16,7 @@
 
 # TODO catching name collisions in generated code would be nice
 
+from abc import ABC, abstractmethod
 from collections import OrderedDict
 import os
 import re
@@ -253,10 +254,11 @@ def visit(self, visitor):
         visitor.visit_include(self._sub_module.name, self.info)
 
 
-class QAPISchemaType(QAPISchemaDefinition):
+class QAPISchemaType(QAPISchemaDefinition, ABC):
     # Return the C type for common use.
     # For the types we commonly box, this is a pointer type.
-    def c_type(self):
+    @abstractmethod
+    def c_type(self) -> str:
         pass
 
     # Return the C type to be used in a parameter list.
@@ -267,7 +269,8 @@ def c_param_type(self):
     def c_unboxed_type(self):
         return self.c_type()
 
-    def json_type(self):
+    @abstractmethod
+    def json_type(self) -> str:
         pass
 
     def alternate_qtype(self):
-- 
2.43.0