shave this yak some more, make `Callback` type alias have two lifetimes
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parent
da1e1625b3
commit
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15
src/lua.rs
15
src/lua.rs
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@ -973,7 +973,7 @@ impl Lua {
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fn create_callback_function<'lua, 'callback>(
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&'lua self,
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func: Callback<'callback>,
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func: Callback<'callback, 'static>,
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) -> Result<Function<'lua>> {
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unsafe extern "C" fn callback_call_impl(state: *mut ffi::lua_State) -> c_int {
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callback_error(state, || {
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@ -1066,16 +1066,11 @@ impl<'lua, 'scope> Scope<'lua, 'scope> {
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R: ToLuaMulti<'callback>,
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F: 'scope + Fn(&'callback Lua, A) -> Result<R>,
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{
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let f: Box<
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Fn(&'callback Lua, MultiValue<'callback>) -> Result<MultiValue<'callback>> + 'scope,
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> = Box::new(move |lua, args| func(lua, A::from_lua_multi(args, lua)?)?.to_lua_multi(lua));
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unsafe {
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// SCARY, we are transmuting the 'scope lifetime to 'static.
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let f: Box<
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Fn(&'callback Lua, MultiValue<'callback>) -> Result<MultiValue<'callback>>,
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> = mem::transmute(f);
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let f = Box::new(move |lua, args| {
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func(lua, A::from_lua_multi(args, lua)?)?.to_lua_multi(lua)
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});
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let f = mem::transmute::<Callback<'callback, 'scope>, Callback<'callback, 'static>>(f);
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let mut f = self.lua.create_callback_function(f)?;
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f.0.drop_unref = false;
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@ -44,7 +44,8 @@ impl Drop for RegistryKey {
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}
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}
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pub(crate) type Callback<'lua> = Box<Fn(&'lua Lua, MultiValue<'lua>) -> Result<MultiValue<'lua>>>;
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pub(crate) type Callback<'lua, 'a> =
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Box<Fn(&'lua Lua, MultiValue<'lua>) -> Result<MultiValue<'lua>> + 'a>;
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pub(crate) struct LuaRef<'lua> {
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pub lua: &'lua Lua,
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@ -72,8 +72,8 @@ pub enum MetaMethod {
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///
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/// [`UserData`]: trait.UserData.html
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pub struct UserDataMethods<'lua, T> {
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pub(crate) methods: HashMap<StdString, Callback<'lua>>,
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pub(crate) meta_methods: HashMap<MetaMethod, Callback<'lua>>,
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pub(crate) methods: HashMap<StdString, Callback<'lua, 'static>>,
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pub(crate) meta_methods: HashMap<MetaMethod, Callback<'lua, 'static>>,
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pub(crate) _type: PhantomData<T>,
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}
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@ -175,7 +175,7 @@ impl<'lua, T: UserData> UserDataMethods<'lua, T> {
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self.meta_methods.insert(meta, Self::box_function(function));
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}
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fn box_function<A, R, F>(function: F) -> Callback<'lua>
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fn box_function<A, R, F>(function: F) -> Callback<'lua, 'static>
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where
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A: FromLuaMulti<'lua>,
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R: ToLuaMulti<'lua>,
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@ -184,7 +184,7 @@ impl<'lua, T: UserData> UserDataMethods<'lua, T> {
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Box::new(move |lua, args| function(lua, A::from_lua_multi(args, lua)?)?.to_lua_multi(lua))
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}
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fn box_method<A, R, M>(method: M) -> Callback<'lua>
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fn box_method<A, R, M>(method: M) -> Callback<'lua, 'static>
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where
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A: FromLuaMulti<'lua>,
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R: ToLuaMulti<'lua>,
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@ -205,7 +205,7 @@ impl<'lua, T: UserData> UserDataMethods<'lua, T> {
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})
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}
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fn box_method_mut<A, R, M>(method: M) -> Callback<'lua>
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fn box_method_mut<A, R, M>(method: M) -> Callback<'lua, 'static>
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where
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A: FromLuaMulti<'lua>,
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R: ToLuaMulti<'lua>,
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