From db8c7f14d2f74c3db205782acf8222cb7d91a047 Mon Sep 17 00:00:00 2001
From: _ov4 <ov4@ov4.org>
Date: Wed, 21 Oct 2026 06:14:00 +0000
Subject: feat(codegen): instantiate class templates

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 tests/i/template-classes/program.cps | 110 +++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 tests/i/template-classes/program.cps

(limited to 'tests/i/template-classes/program.cps')

diff --git a/tests/i/template-classes/program.cps b/tests/i/template-classes/program.cps
new file mode 100644
index 0000000..90427d3
--- /dev/null
+++ b/tests/i/template-classes/program.cps
@@ -0,0 +1,110 @@
+TEMPLATE <T>
+CLASS Box
+    PRIVATE Value : T
+    PUBLIC OVERLOAD PROCEDURE NEW()
+    ENDPROCEDURE
+    PUBLIC OVERLOAD PROCEDURE NEW(V : T)
+        Value <- V
+    ENDPROCEDURE
+    PUBLIC FUNCTION Get() RETURNS T
+        RETURN Value
+    ENDFUNCTION
+    PUBLIC PROCEDURE Set(V : T)
+        Value <- V
+    ENDPROCEDURE
+ENDCLASS
+
+TEMPLATE <T>
+FUNCTION Make() RETURNS T
+    DECLARE Value : T
+    RETURN Value
+ENDFUNCTION
+
+TEMPLATE <A, B>
+CLASS Pair
+    First : A
+    Second : B
+    PROCEDURE NEW(Left : A, Right : B)
+        First <- Left
+        Second <- Right
+    ENDPROCEDURE
+ENDCLASS
+
+TEMPLATE <T>
+CLASS Stack3
+    PRIVATE First : T
+    PRIVATE Second : T
+    PRIVATE Third : T
+    PRIVATE Count : INTEGER
+    PROCEDURE Push(Value : T)
+        Count <- Count + 1
+        CASE OF Count
+            1 : First <- Value
+            2 : Second <- Value
+            3 : Third <- Value
+        ENDCASE
+    ENDPROCEDURE
+    FUNCTION Pop() RETURNS T
+        Count <- Count - 1
+        CASE OF Count
+            2 : RETURN Third
+            1 : RETURN Second
+            OTHERWISE : RETURN First
+        ENDCASE
+    ENDFUNCTION
+ENDCLASS
+
+OVERLOAD PROCEDURE PrintAll()
+ENDPROCEDURE
+TEMPLATE <T, Rest...>
+OVERLOAD PROCEDURE PrintAll(First : T, Others : Rest...)
+    OUTPUT First
+    CALL PrintAll(Others...)
+ENDPROCEDURE
+
+TEMPLATE <Types...>
+CLASS Group
+    PROCEDURE Show(Values : Types...)
+        CALL PrintAll(Values...)
+    ENDPROCEDURE
+ENDCLASS
+TEMPLATE <Types...>
+PROCEDURE ShowGroup(Values : Types...)
+    DECLARE Items : Group<Types...>
+    CALL Items.Show(Values...)
+ENDPROCEDURE
+
+// Instantiation during the type pre-pass defers the Box method prototypes.
+TYPE Holder
+    DECLARE Item : Box<INTEGER>
+ENDTYPE
+OUTPUT Make<Box<BOOLEAN>>().Get()
+DECLARE H : Holder
+OUTPUT H.Item.Get()
+DECLARE B : Box<INTEGER>(7)
+OUTPUT B.Get()
+DECLARE P : Pair<INTEGER, REAL>(3, 2.5)
+OUTPUT P.First
+OUTPUT P.Second
+DECLARE S : Stack3<INTEGER>
+CALL S.Push(10)
+CALL S.Push(20)
+CALL S.Push(30)
+OUTPUT S.Pop()
+OUTPUT S.Pop()
+OUTPUT S.Pop()
+B <- NEW Box<INTEGER>(5)
+OUTPUT B.Get()
+DELETE B
+DECLARE Inner : Box<INTEGER>(9)
+DECLARE Outer : Box<Box<INTEGER>>(Inner)
+OUTPUT Outer.Get().Get()
+DECLARE Text : Box<STRING>("alpha")
+DECLARE Copy : Box<STRING>
+Copy <- Text
+CALL Text.Set("beta")
+OUTPUT Copy.Get()
+OUTPUT Text.Get()
+DECLARE Values : Group<INTEGER, REAL, CHAR>
+CALL Values.Show(1, 2.5, 'c')
+CALL ShowGroup()
-- 
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