1 /// Auto-generated bindings for a pre-instantiated version of a
2 /// component which implements the world `empty`.
3 ///
4 /// This structure is created through [`EmptyPre::new`] which
5 /// takes a [`InstancePre`](wasmtime::component::InstancePre) that
6 /// has been created through a [`Linker`](wasmtime::component::Linker).
7 ///
8 /// For more information see [`Empty`] as well.
9 pub struct EmptyPre<T: 'static> {
10     instance_pre: wasmtime::component::InstancePre<T>,
11     indices: EmptyIndices,
12 }
13 impl<T: 'static> Clone for EmptyPre<T> {
14     fn clone(&self) -> Self {
15         Self {
16             instance_pre: self.instance_pre.clone(),
17             indices: self.indices.clone(),
18         }
19     }
20 }
21 impl<_T: 'static> EmptyPre<_T> {
22     /// Creates a new copy of `EmptyPre` bindings which can then
23     /// be used to instantiate into a particular store.
24     ///
25     /// This method may fail if the component behind `instance_pre`
26     /// does not have the required exports.
27     pub fn new(
28         instance_pre: wasmtime::component::InstancePre<_T>,
29     ) -> wasmtime::Result<Self> {
30         let indices = EmptyIndices::new(&instance_pre)?;
31         Ok(Self { instance_pre, indices })
32     }
33     pub fn engine(&self) -> &wasmtime::Engine {
34         self.instance_pre.engine()
35     }
36     pub fn instance_pre(&self) -> &wasmtime::component::InstancePre<_T> {
37         &self.instance_pre
38     }
39     /// Instantiates a new instance of [`Empty`] within the
40     /// `store` provided.
41     ///
42     /// This function will use `self` as the pre-instantiated
43     /// instance to perform instantiation. Afterwards the preloaded
44     /// indices in `self` are used to lookup all exports on the
45     /// resulting instance.
46     pub async fn instantiate_async(
47         &self,
48         mut store: impl wasmtime::AsContextMut<Data = _T>,
49     ) -> wasmtime::Result<Empty>
50     where
51         _T: Send,
52     {
53         let mut store = store.as_context_mut();
54         let instance = self.instance_pre.instantiate_async(&mut store).await?;
55         self.indices.load(&mut store, &instance)
56     }
57 }
58 /// Auto-generated bindings for index of the exports of
59 /// `empty`.
60 ///
61 /// This is an implementation detail of [`EmptyPre`] and can
62 /// be constructed if needed as well.
63 ///
64 /// For more information see [`Empty`] as well.
65 #[derive(Clone)]
66 pub struct EmptyIndices {}
67 /// Auto-generated bindings for an instance a component which
68 /// implements the world `empty`.
69 ///
70 /// This structure can be created through a number of means
71 /// depending on your requirements and what you have on hand:
72 ///
73 /// * The most convenient way is to use
74 ///   [`Empty::instantiate_async`] which only needs a
75 ///   [`Store`], [`Component`], and [`Linker`].
76 ///
77 /// * Alternatively you can create a [`EmptyPre`] ahead of
78 ///   time with a [`Component`] to front-load string lookups
79 ///   of exports once instead of per-instantiation. This
80 ///   method then uses [`EmptyPre::instantiate_async`] to
81 ///   create a [`Empty`].
82 ///
83 /// * If you've instantiated the instance yourself already
84 ///   then you can use [`Empty::new`].
85 ///
86 /// These methods are all equivalent to one another and move
87 /// around the tradeoff of what work is performed when.
88 ///
89 /// [`Store`]: wasmtime::Store
90 /// [`Component`]: wasmtime::component::Component
91 /// [`Linker`]: wasmtime::component::Linker
92 pub struct Empty {}
93 const _: () = {
94     #[allow(unused_imports)]
95     use wasmtime::component::__internal::anyhow;
96     impl EmptyIndices {
97         /// Creates a new copy of `EmptyIndices` bindings which can then
98         /// be used to instantiate into a particular store.
99         ///
100         /// This method may fail if the component does not have the
101         /// required exports.
102         pub fn new<_T>(
103             _instance_pre: &wasmtime::component::InstancePre<_T>,
104         ) -> wasmtime::Result<Self> {
105             let _component = _instance_pre.component();
106             let _instance_type = _instance_pre.instance_type();
107             Ok(EmptyIndices {})
108         }
109         /// Uses the indices stored in `self` to load an instance
110         /// of [`Empty`] from the instance provided.
111         ///
112         /// Note that at this time this method will additionally
113         /// perform type-checks of all exports.
114         pub fn load(
115             &self,
116             mut store: impl wasmtime::AsContextMut,
117             instance: &wasmtime::component::Instance,
118         ) -> wasmtime::Result<Empty> {
119             let _ = &mut store;
120             let _instance = instance;
121             Ok(Empty {})
122         }
123     }
124     impl Empty {
125         /// Convenience wrapper around [`EmptyPre::new`] and
126         /// [`EmptyPre::instantiate_async`].
127         pub async fn instantiate_async<_T>(
128             store: impl wasmtime::AsContextMut<Data = _T>,
129             component: &wasmtime::component::Component,
130             linker: &wasmtime::component::Linker<_T>,
131         ) -> wasmtime::Result<Empty>
132         where
133             _T: Send,
134         {
135             let pre = linker.instantiate_pre(component)?;
136             EmptyPre::new(pre)?.instantiate_async(store).await
137         }
138         /// Convenience wrapper around [`EmptyIndices::new`] and
139         /// [`EmptyIndices::load`].
140         pub fn new(
141             mut store: impl wasmtime::AsContextMut,
142             instance: &wasmtime::component::Instance,
143         ) -> wasmtime::Result<Empty> {
144             let indices = EmptyIndices::new(&instance.instance_pre(&store))?;
145             indices.load(&mut store, instance)
146         }
147     }
148 };
149