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 fn instantiate(
47         &self,
48         mut store: impl wasmtime::AsContextMut<Data = _T>,
49     ) -> wasmtime::Result<Empty> {
50         let mut store = store.as_context_mut();
51         let instance = self.instance_pre.instantiate(&mut store)?;
52         self.indices.load(&mut store, &instance)
53     }
54 }
55 impl<_T: Send + 'static> EmptyPre<_T> {
56     /// Same as [`Self::instantiate`], except with `async`.
57     pub async fn instantiate_async(
58         &self,
59         mut store: impl wasmtime::AsContextMut<Data = _T>,
60     ) -> wasmtime::Result<Empty> {
61         let mut store = store.as_context_mut();
62         let instance = self.instance_pre.instantiate_async(&mut store).await?;
63         self.indices.load(&mut store, &instance)
64     }
65 }
66 /// Auto-generated bindings for index of the exports of
67 /// `empty`.
68 ///
69 /// This is an implementation detail of [`EmptyPre`] and can
70 /// be constructed if needed as well.
71 ///
72 /// For more information see [`Empty`] as well.
73 #[derive(Clone)]
74 pub struct EmptyIndices {}
75 /// Auto-generated bindings for an instance a component which
76 /// implements the world `empty`.
77 ///
78 /// This structure can be created through a number of means
79 /// depending on your requirements and what you have on hand:
80 ///
81 /// * The most convenient way is to use
82 ///   [`Empty::instantiate`] which only needs a
83 ///   [`Store`], [`Component`], and [`Linker`].
84 ///
85 /// * Alternatively you can create a [`EmptyPre`] ahead of
86 ///   time with a [`Component`] to front-load string lookups
87 ///   of exports once instead of per-instantiation. This
88 ///   method then uses [`EmptyPre::instantiate`] to
89 ///   create a [`Empty`].
90 ///
91 /// * If you've instantiated the instance yourself already
92 ///   then you can use [`Empty::new`].
93 ///
94 /// These methods are all equivalent to one another and move
95 /// around the tradeoff of what work is performed when.
96 ///
97 /// [`Store`]: wasmtime::Store
98 /// [`Component`]: wasmtime::component::Component
99 /// [`Linker`]: wasmtime::component::Linker
100 pub struct Empty {}
101 const _: () = {
102     #[allow(unused_imports)]
103     use wasmtime::component::__internal::anyhow;
104     impl EmptyIndices {
105         /// Creates a new copy of `EmptyIndices` bindings which can then
106         /// be used to instantiate into a particular store.
107         ///
108         /// This method may fail if the component does not have the
109         /// required exports.
110         pub fn new<_T>(
111             _instance_pre: &wasmtime::component::InstancePre<_T>,
112         ) -> wasmtime::Result<Self> {
113             let _component = _instance_pre.component();
114             let _instance_type = _instance_pre.instance_type();
115             Ok(EmptyIndices {})
116         }
117         /// Uses the indices stored in `self` to load an instance
118         /// of [`Empty`] from the instance provided.
119         ///
120         /// Note that at this time this method will additionally
121         /// perform type-checks of all exports.
122         pub fn load(
123             &self,
124             mut store: impl wasmtime::AsContextMut,
125             instance: &wasmtime::component::Instance,
126         ) -> wasmtime::Result<Empty> {
127             let _ = &mut store;
128             let _instance = instance;
129             Ok(Empty {})
130         }
131     }
132     impl Empty {
133         /// Convenience wrapper around [`EmptyPre::new`] and
134         /// [`EmptyPre::instantiate`].
135         pub fn instantiate<_T>(
136             store: impl wasmtime::AsContextMut<Data = _T>,
137             component: &wasmtime::component::Component,
138             linker: &wasmtime::component::Linker<_T>,
139         ) -> wasmtime::Result<Empty> {
140             let pre = linker.instantiate_pre(component)?;
141             EmptyPre::new(pre)?.instantiate(store)
142         }
143         /// Convenience wrapper around [`EmptyIndices::new`] and
144         /// [`EmptyIndices::load`].
145         pub fn new(
146             mut store: impl wasmtime::AsContextMut,
147             instance: &wasmtime::component::Instance,
148         ) -> wasmtime::Result<Empty> {
149             let indices = EmptyIndices::new(&instance.instance_pre(&store))?;
150             indices.load(&mut store, instance)
151         }
152         /// Convenience wrapper around [`EmptyPre::new`] and
153         /// [`EmptyPre::instantiate_async`].
154         pub async fn instantiate_async<_T>(
155             store: impl wasmtime::AsContextMut<Data = _T>,
156             component: &wasmtime::component::Component,
157             linker: &wasmtime::component::Linker<_T>,
158         ) -> wasmtime::Result<Empty>
159         where
160             _T: Send,
161         {
162             let pre = linker.instantiate_pre(component)?;
163             EmptyPre::new(pre)?.instantiate_async(store).await
164         }
165     }
166 };
167