luaL_testudata

rglua::lua

Function luaL_testudata 

Source 
pub fn luaL_testudata(
    l: LuaState,
    arg: c_int,
    tname: LuaString,
) -> Option<*mut Userdata>
Expand description

This function works like luaL_checkudata, except that, when the test fails, it returns None instead of throwing an error.
Adapted from Lua 5.3, note this does not actually exist in gluajit