added a quick experimental system for overriding core natives

--HG--
extra : convert_revision : svn%3A39bc706e-5318-0410-9160-8a85361fbb7c/trunk%401695

public/IExtensionSys.h

@@ -127,8 +127,11 @@ namespace SourceMod
 
 	/**
 	 * @brief Version code of the IExtensionInterface API itself.
+	 *
+	 * Note: This is bumped when IShareSys is changed, because IShareSys 
+	 * itself is not versioned.
 	 */
-	#define SMINTERFACE_EXTENSIONAPI_VERSION	2
+	#define SMINTERFACE_EXTENSIONAPI_VERSION	3
 
 	/**
 	 * @brief The interface an extension must expose.

public/IShareSys.h

@@ -200,6 +200,29 @@ namespace SourceMod
 		 * @param name			Library name.
 		 */
 		virtual void RegisterLibrary(IExtension *myself, const char *name) =0;
+
+		/**
+		 * @brief Adds a list of natives to the global native pool, to be 
+		 * bound on plugin load.
+		 *
+		 * Unlike AddNatives(), this function implements natives that are 
+		 * ALWAYS bound, regardless of whether a previous function is bound. 
+		 * That means extensions can override Core natives.
+		 *
+		 * A Core version of each native must exist.  If one does not, then 
+		 * Core will simply ignore that entry.
+		 *
+		 * Override natives represent a weak coupling.  If the extension is 
+		 * unloaded, the native will be re-bound to the Core version.
+		 * 
+		 * @param myself		Identity token of parent object.
+		 * @param natives		Array of natives to add.  The last entry in 
+		 *						the array must be filled with NULLs to 
+		 *						terminate the array.  The array must be static 
+		 *						as Core will cache the pointer for the 
+		 *						lifetime of the extension.
+		 */
+		virtual void OverrideNatives(IExtension *myself, const sp_nativeinfo_t *natives) =0;
 	};
 }