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+- Feature Name: Standard OOP model
+- Start Date: May 5th 2020
+- RFC PR:
+- RFC Issue:
+
+Summary
+=======
+
+Motivation
+==========
+
+Guide-level explanation
+=======================
+
+Dispatching and Class Wide Views
+--------------------------------
+
+A new library / partition level pragma is introduced, Default_Dispatching_Calls.
+When active, calls to primitives are dispatching (when the tag can be
+determined statically, the compiler may optimize the call to be static) unless
+explicitely marked as static (for example, through 'Super). E.g:
+
+.. code-block:: ada
+
+   pragma Default_Dispatching_Calls (On);
+
+   type Root is tagged null record;
+
+   procedure P (Self : in out Root);
+
+   type Child is new Root with null record;
+
+   procedure P (Self : in out Root);
+
+   type A_Root is access all Root;
+
+   procedure P (V : in out Root) is
+   begin
+      V.P2; -- Dispatching
+   end P;
+
+   V : A_Root := new Child;
+
+   V.P; -- dispatching
+
+Default_Dispatching_Calls is On by default on new version of the language.
+
+Note that the decision to dispatch or not is made at the point of the call, not
+the subprogram declaration. For example:
+
+.. code-block:: ada
+
+   package A is
+
+      pragma Default_Dispatching_Calls (Off);
+
+      type Root is tagged null record;
+
+      procedure P (Self : in out Root);
+
+      type Child is new Root with null record;
+
+      procedure P (Self : in out Root);
+
+   end A;
+
+   package body A is
+
+      [... some code ...]
+
+      procedure Something (X : Root) is
+      begin
+         X.P; -- NOT Dispatching
+      end Something;
+
+      [... some code ...]
+
+   end A;
+
+   package body B is
+
+      pragma Default_Dispatching_Calls (On);
+
+      [... some code ...]
+
+      procedure Something_Else (X : Root) is
+      begin
+         X.P; -- Dispatching
+      end Something_Else;
+
+      [... some code ...]
+
+   end B;
+
+Multi-Parameter Dispatching
+---------------------------
+
+Under this new pragma Default_Dispatching_Calls, primitives with more than
+one controlling parameter behave in the following way:
+
+- If they're called on a dispatching call, then everything works as if all
+  controlling parameters were converted to class wide view. And indeed, in that
+  case, we would have dynamic tag check as you do today in Ada.
+
+- If it's a non-dispatching call, today that's through 'Super, then you will
+  statically select the primitive, and will need to be able to statically check
+  the static type of all parameters.
+
+For example:
+
+.. code-block:: ada
+
+   pragma Default_Dispatching_Calls (On);
+
+   type Root is tagged null record;
+
+   procedure Prim (A, B : Root);
+
+   type Child is new Root with null record;
+
+   overriding procedure Prim (A, B : Child);
+
+   R1, R2 : Root;
+   C1, C2 : Child;
+
+   C1'Super.Prim (R2); -- static, legal
+   C1'Super.Prim (C2'Super); -- static, legal
+   C1'Super.Prim (C2); -- illegal, C2 is of the wrong type
+
+Note that this is a problem when integrating with current Ada, pedantic Flare
+does not support multi-parameter dispatching.
+
+Dispactching on Returned Types
+------------------------------
+
+A tag indeterminate disatching call is illegal (as it is the case today). For
+example:
+
+.. code-block:: ada
+
+     pragma Default_Dispatching_Calls (On);
+     type T is tagged ... ;
+     function Make return T; -- primitive
+     Obj1 : T'Class := ...
+     Obj2 : T'Class := Make; -- illegal
+   begin
+     Obj1 := Make; -- legal; use Obj1'Tag to dispatch
+
+
+Access to Subprograms
+---------------------
+
+Access to dispatching primitives are dispatching if their access is taken in
+a scope where Default_Dispatching_Calls is On. For example:
+
+.. code-block:: ada
+
+   package A is
+
+      pragma Default_Dispatching_Calls (Off);
+
+      type Root is tagged null record;
+
+      procedure P (Self : in out Root);
+
+      type Acc is access all procedure (Self : in out Root);
+
+      A_D : Acc;
+      A_ND : Acc;
+
+   end A;
+
+   package body B is
+
+      pragma Default_Dispatching_Calls (On);
+
+      [... some code ...]
+
+         A_D := A.P'Access; -- This will be dispatching.
+
+      [... some code ...]
+
+   end B;
+
+   package body C is
+
+      pragma Default_Dispatching_Calls (Off);
+
+      [... some code ...]
+
+         A_ND := A.P'Access; -- This will not be dispatching.
+
+      [... some code ...]
+
+   end C;
+
+   package body D is
+
+      [... some code ...]
+
+         A_D.all (Obj); -- This dispatches
+         A_ND.all (Obj); -- This doesn't dispatches
+
+      [... some code ...]
+
+   end D;
+
+In other words, the decision on how a call to an access to subprogram behaves
+is taken at the point where the access value is created (through 'Access). A
+potential implementation could be to have a wrapper generated to provide a
+different version of the subprogram depending on the context. Note that
+this means that subsequent usage of the 'Access attribute may not yield the
+same address, which is allowed.
+
+Reference-level explanation
+===========================
+
+
+Rationale and alternatives
+==========================
+
+It is a potential vulnerability not to call an overriden primitive. This may
+lead to an object to be in an state that has not been anticipated, in particular
+when the role of the overriden primitive is to keep the state of the derived
+object consistant. It's also commonly the case in most OOP languages that
+dispatching is the default expected behavior and non dispatching the exception.
+
+This also fixes a common confusion in Ada, where the dispatching parameter of A
+primitive is itself non-dispatching and requires so-called redispatching. The
+following code illustrates the improvement:
+
+.. code-block:: ada
+
+   package P is
+      type T1 is tagged null record;
+
+      procedure P (Self : in out T1);
+
+      procedure P2 (Self : in out T1);
+   end P;
+
+   package P is
+      procedure P (Self : in out T1) is
+      begin
+         T1'Class (Self).P2; -- Dispatching in all cases
+         Self.P2; -- Only dispatching with Default_Dispatching_Calls (On)
+      end P;
+   end P;
+
+
+Drawbacks
+=========
+
+
+Prior art
+=========
+
+
+Unresolved questions
+====================
+
+Future possibilities
+====================