From 6508cfd8fe55e03a587b2f72d3ffc901d7ada049 Mon Sep 17 00:00:00 2001
From: Tom Willemse
Date: Wed, 25 Aug 2021 01:08:14 -0700
Subject: Chapter 18.1 - 18.3

---
 clox/src/value.h | 33 ++++++++++++++++++++++++++++-----
 1 file changed, 28 insertions(+), 5 deletions(-)

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

diff --git a/clox/src/value.h b/clox/src/value.h
index 86d4b1c..7478aaf 100644
--- a/clox/src/value.h
+++ b/clox/src/value.h
@@ -3,17 +3,40 @@
 
 #include "common.h"
 
-typedef double Value;
+typedef enum {
+  VAL_BOOL,
+  VAL_NIL,
+  VAL_NUMBER,
+} ValueType;
+
+typedef struct {
+  ValueType type;
+  union {
+    bool boolean;
+    double number;
+  } as;
+} Value;
+
+#define IS_BOOL(value) ((value).type == VAL_BOOL)
+#define IS_NIL(value) ((value).type == VAL_NIL)
+#define IS_NUMBER(value) ((value).type == VAL_NUMBER)
+
+#define AS_BOOL(value) ((value).as.boolean)
+#define AS_NUMBER(value) ((value).as.number)
+
+#define BOOL_VAL(value) ((Value){VAL_BOOL, {.boolean = value}})
+#define NIL_VAL ((Value){VAL_NIL, {.number = 0}})
+#define NUMBER_VAL(value) ((Value){VAL_NUMBER, {.number = value}})
 
 typedef struct {
   int capacity;
   int count;
-  Value* values;
+  Value *values;
 } ValueArray;
 
-void initValueArray(ValueArray* array);
-void writeValueArray(ValueArray* array, Value value);
-void freeValueArray(ValueArray* array);
+void initValueArray(ValueArray *array);
+void writeValueArray(ValueArray *array, Value value);
+void freeValueArray(ValueArray *array);
 void printValue(Value value);
 
 #endif
-- 
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