From 50d6f146f4cd24b7ea4532ec70fae348056acc32 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Sat, 21 May 2016 15:43:19 +0200
Subject: allow lua to access array at an offset

---
 libs/lua/LuaBridge/detail/CFunctions.h | 8 ++++++++
 libs/lua/LuaBridge/detail/Namespace.h  | 7 ++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

(limited to 'libs/lua')

diff --git a/libs/lua/LuaBridge/detail/CFunctions.h b/libs/lua/LuaBridge/detail/CFunctions.h
index 6f43919216..15bc7022b3 100644
--- a/libs/lua/LuaBridge/detail/CFunctions.h
+++ b/libs/lua/LuaBridge/detail/CFunctions.h
@@ -969,6 +969,14 @@ struct CFunc
     return 0;
   }
 
+  // return same array at an offset
+  template <typename T>
+  static int offsetArray (lua_State* L) {
+    T *v = luabridge::Stack<T*>::get (L, 1);
+    const unsigned int i = luabridge::Stack<unsigned int>::get (L, 2);
+    Stack <T*>::push (L, &v[i]);
+    return 1;
+  }
 
   //--------------------------------------------------------------------------
   /**
diff --git a/libs/lua/LuaBridge/detail/Namespace.h b/libs/lua/LuaBridge/detail/Namespace.h
index c859d8d151..590f25be4a 100644
--- a/libs/lua/LuaBridge/detail/Namespace.h
+++ b/libs/lua/LuaBridge/detail/Namespace.h
@@ -1070,7 +1070,9 @@ private:
       PRINTDOC ("Ext C Function", _name << "set_table",
           std::string(""), "int (*)(lua_State*)")
       PRINTDOC("Member Function", _name << "sameinstance",
-          std::string("bool"), std::string("void (*)(" + type_name <T>() + "*)"))
+          std::string("bool"), std::string("bool (*)(" + type_name <T>() + "*)"))
+      PRINTDOC("Member Function", _name << "offset",
+          std::string(type_name <T>() + "*"), std::string(type_name <T>() + "* (*)(unsigned int)"))
 
       m_stackSize = parent->m_stackSize + 3;
       parent->m_stackSize = 0;
@@ -1132,6 +1134,9 @@ private:
         lua_pushcclosure (L, &CFunc::ClassEqualCheck <T>::f, 0);
         rawsetfield (L, -3, "sameinstance");
 
+        lua_pushcclosure (L, &CFunc::offsetArray <T>, 0);
+        rawsetfield (L, -3, "offset"); // class table
+
       }
       else
       {
-- 
cgit v1.2.3