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> {
10     instance_pre: wasmtime::component::InstancePre<T>,
11     indices: EmptyIndices,
12 }
13 impl<T> 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> 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.component())?;
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 /// * You can also access the guts of instantiation through
87 ///   [`EmptyIndices::new_instance`] followed
88 ///   by [`EmptyIndices::load`] to crate an instance of this
89 ///   type.
90 ///
91 /// These methods are all equivalent to one another and move
92 /// around the tradeoff of what work is performed when.
93 ///
94 /// [`Store`]: wasmtime::Store
95 /// [`Component`]: wasmtime::component::Component
96 /// [`Linker`]: wasmtime::component::Linker
97 pub struct Empty {}
98 const _: () = {
99     #[allow(unused_imports)]
100     use wasmtime::component::__internal::anyhow;
101     impl EmptyIndices {
102         /// Creates a new copy of `EmptyIndices` bindings which can then
103         /// be used to instantiate into a particular store.
104         ///
105         /// This method may fail if the component does not have the
106         /// required exports.
107         pub fn new(
108             component: &wasmtime::component::Component,
109         ) -> wasmtime::Result<Self> {
110             let _component = component;
111             Ok(EmptyIndices {})
112         }
113         /// Creates a new instance of [`EmptyIndices`] from an
114         /// instantiated component.
115         ///
116         /// This method of creating a [`Empty`] will perform string
117         /// lookups for all exports when this method is called. This
118         /// will only succeed if the provided instance matches the
119         /// requirements of [`Empty`].
120         pub fn new_instance(
121             mut store: impl wasmtime::AsContextMut,
122             instance: &wasmtime::component::Instance,
123         ) -> wasmtime::Result<Self> {
124             let _instance = instance;
125             Ok(EmptyIndices {})
126         }
127         /// Uses the indices stored in `self` to load an instance
128         /// of [`Empty`] from the instance provided.
129         ///
130         /// Note that at this time this method will additionally
131         /// perform type-checks of all exports.
132         pub fn load(
133             &self,
134             mut store: impl wasmtime::AsContextMut,
135             instance: &wasmtime::component::Instance,
136         ) -> wasmtime::Result<Empty> {
137             let _instance = instance;
138             Ok(Empty {})
139         }
140     }
141     impl Empty {
142         /// Convenience wrapper around [`EmptyPre::new`] and
143         /// [`EmptyPre::instantiate_async`].
144         pub async fn instantiate_async<_T>(
145             mut store: impl wasmtime::AsContextMut<Data = _T>,
146             component: &wasmtime::component::Component,
147             linker: &wasmtime::component::Linker<_T>,
148         ) -> wasmtime::Result<Empty>
149         where
150             _T: Send,
151         {
152             let pre = linker.instantiate_pre(component)?;
153             EmptyPre::new(pre)?.instantiate_async(store).await
154         }
155         /// Convenience wrapper around [`EmptyIndices::new_instance`] and
156         /// [`EmptyIndices::load`].
157         pub fn new(
158             mut store: impl wasmtime::AsContextMut,
159             instance: &wasmtime::component::Instance,
160         ) -> wasmtime::Result<Empty> {
161             let indices = EmptyIndices::new_instance(&mut store, instance)?;
162             indices.load(store, instance)
163         }
164     }
165 };
166