Methods separated from metamethods in 'io'
In the 'io' library, changed the use of the metatable also as its
own "method table", so that metamethods cannot be accessed as if they
were methods. (For instance, 'io.stdin.__gc' does not result in
the finalizer metamethod anymore.)
diff --git a/liolib.c b/liolib.c
index 1484676..2c0c6a3 100644
--- a/liolib.c
+++ b/liolib.c
@@ -742,14 +742,23 @@
/*
** methods for file handles
*/
-static const luaL_Reg flib[] = {
- {"close", f_close},
- {"flush", f_flush},
- {"lines", f_lines},
+static const luaL_Reg meth[] = {
{"read", f_read},
- {"seek", f_seek},
- {"setvbuf", f_setvbuf},
{"write", f_write},
+ {"lines", f_lines},
+ {"flush", f_flush},
+ {"seek", f_seek},
+ {"close", f_close},
+ {"setvbuf", f_setvbuf},
+ {NULL, NULL}
+};
+
+
+/*
+** metamethods for file handles
+*/
+static const luaL_Reg metameth[] = {
+ {"__index", NULL}, /* place holder */
{"__gc", f_gc},
{"__close", f_gc},
{"__tostring", f_tostring},
@@ -758,11 +767,12 @@
static void createmeta (lua_State *L) {
- luaL_newmetatable(L, LUA_FILEHANDLE); /* create metatable for file handles */
- lua_pushvalue(L, -1); /* push metatable */
- lua_setfield(L, -2, "__index"); /* metatable.__index = metatable */
- luaL_setfuncs(L, flib, 0); /* add file methods to new metatable */
- lua_pop(L, 1); /* pop new metatable */
+ luaL_newmetatable(L, LUA_FILEHANDLE); /* metatable for file handles */
+ luaL_setfuncs(L, metameth, 0); /* add metamethods to new metatable */
+ luaL_newlibtable(L, meth); /* create method table */
+ luaL_setfuncs(L, meth, 0); /* add file methods to method table */
+ lua_setfield(L, -2, "__index"); /* metatable.__index = method table */
+ lua_pop(L, 1); /* pop metatable */
}
