From 3da4016d5784adef217fff0ad1e3a0ceff76290f Mon Sep 17 00:00:00 2001
From: Tom Willemse
Date: Tue, 22 Mar 2022 17:15:17 -0700
Subject: Chapter 24.7

---
 clox/src/object.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'clox/src/object.h')

diff --git a/clox/src/object.h b/clox/src/object.h
index 812c464..b5942d6 100644
--- a/clox/src/object.h
+++ b/clox/src/object.h
@@ -8,14 +8,17 @@
 #define OBJ_TYPE(value) (AS_OBJ(value)->type)
 
 #define IS_FUNCTION(value) isObjType(value, OBJ_FUNCTION)
+#define IS_NATIVE(value) isObjType(value, OBJ_NATIVE)
 #define IS_STRING(value) isObjType(value, OBJ_STRING)
 
 #define AS_FUNCTION(value) ((ObjFunction *)AS_OBJ(value))
+#define AS_NATIVE(value) (((ObjNative *)AS_OBJ(value))->function)
 #define AS_STRING(value) ((ObjString *)AS_OBJ(value))
 #define AS_CSTRING(value) (((ObjString *)AS_OBJ(value))->chars)
 
 typedef enum {
   OBJ_FUNCTION,
+  OBJ_NATIVE,
   OBJ_STRING,
 } ObjType;
 
@@ -31,6 +34,13 @@ typedef struct {
   ObjString *name;
 } ObjFunction;
 
+typedef Value (*NativeFn)(int argCount, Value *args);
+
+typedef struct {
+  Obj obj;
+  NativeFn function;
+} ObjNative;
+
 struct ObjString {
   Obj obj;
   int length;
@@ -39,6 +49,7 @@ struct ObjString {
 };
 
 ObjFunction *newFunction();
+ObjNative *newNative(NativeFn function);
 ObjString *takeString(char *chars, int length);
 ObjString *copyString(const char *chars, int length);
 void printObject(Value value);
-- 
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