Default MemberCacheFlags based on intents

discord/client.py

@@ -147,6 +147,8 @@ class Client:
         .. versionadded:: 1.5
     member_cache_flags: :class:`MemberCacheFlags`
         Allows for finer control over how the library caches members.
+        If not given, defaults to cache as much as possible is with the
+        currently selected intents.
 
         .. versionadded:: 1.5
     fetch_offline_members: :class:`bool`

discord/flags.py

@@ -754,6 +754,32 @@ class MemberCacheFlags(BaseFlags):
         """
         return 4
 
+    @classmethod
+    def from_intents(cls, intents):
+        """A factory method that creates a :class:`MemberCacheFlags` based on
+        the currently selected :class:`Intents`.
+
+        Parameters
+        ------------
+        intents: :class:`Intents`
+            The intents to select from.
+
+        Returns
+        ---------
+        :class:`MemberCacheFlags`
+            The resulting member cache flags.
+        """
+
+        self = cls.none()
+        if intents.members:
+            self.joined = True
+        if intents.presences:
+            self.online = True
+        if intents.voice_states:
+            self.voice = True
+
+        return self
+
     def _verify_intents(self, intents):
         if self.online and not intents.presences:
             raise ValueError('MemberCacheFlags.online requires Intents.presences enabled')

discord/state.py

@@ -144,7 +144,7 @@ class ConnectionState:
 
         cache_flags = options.get('member_cache_flags', None)
         if cache_flags is None:
-            cache_flags = MemberCacheFlags.all()
+            cache_flags = MemberCacheFlags.from_intents(intents)
         else:
             if not isinstance(cache_flags, MemberCacheFlags):
                 raise TypeError('member_cache_flags parameter must be MemberCacheFlags not %r' % type(cache_flags))