Struct LStream 

pub struct LStream {
    pub file: Option<Box<dyn LuaFileHandle>>,
    pub close_fn: Option<fn(&mut LuaState) -> Result<usize, LuaError>>,
}

Lua file handle stored as the typed payload of a LuaUserData.

C equivalent: typedef luaL_Stream LStream in liolib.c.

TODO(port): Phase B must arrange for LStream to live inside LuaUserData’s opaque payload. The userdata system needs a typed-access API, e.g. state.check_arg_typed_userdata::<LStream>(1, LUA_FILE_HANDLE)?.

TODO(port): file must be Option<RefCell<Box<dyn LuaFileOps>>> to allow interior-mutability borrow splitting between the file handle and LuaState.

Fields

file: Option<Box<dyn LuaFileHandle>>

OS file handle. None = incompletely opened (pre-file pattern). Concrete implementations are installed via GlobalState::file_open_hook (registered by lua-cli) to keep std::fs out of lua-stdlib.

close_fn: Option<fn(&mut LuaState) -> Result<usize, LuaError>>

Close callback. None means the stream is closed. C: p->closef == NULL.

Implementations

impl LStream

pub fn is_closed(&self) -> bool

isclosed(p) in C: true when closef is NULL.