From f3c354d396a38033dac28ece6f6220e75cef5aec Mon Sep 17 00:00:00 2001
From: Guillermo Ramos
Date: Tue, 1 Jul 2014 20:51:07 +0200
Subject: [Lua] Día 2 (sin terminar)

---
 lua/strict.lua | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 lua/strict.lua

(limited to 'lua/strict.lua')

diff --git a/lua/strict.lua b/lua/strict.lua
new file mode 100644
index 0000000..1c70442
--- /dev/null
+++ b/lua/strict.lua
@@ -0,0 +1,25 @@
+local _private = {}
+
+function strict_read(table, key)
+   if _private[key] then
+      return _private[key]
+   else
+      error("Invalid key: " .. key)
+   end
+end
+
+function strict_write(table, key, value)
+   if _private[key] then
+      error("Duplicate key: " .. key)
+   else
+      _private[key] = value
+   end
+end
+
+local mt = {
+   __index = strict_read,
+   __newindex = strict_write
+}
+
+treasure = {}
+setmetatable(treasure, mt)
-- 
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