1 /// Auto-generated bindings for a pre-instantiated version of a
2 /// copmonent which implements the world `foo`.
3 ///
4 /// This structure is created through [`FooPre::new`] which
5 /// takes a [`InstancePre`](wasmtime::component::InstancePre) that
6 /// has been created through a [`Linker`](wasmtime::component::Linker).
7 pub struct FooPre<T> {
8     instance_pre: wasmtime::component::InstancePre<T>,
9     new: wasmtime::component::ComponentExportIndex,
10 }
11 /// Auto-generated bindings for an instance a component which
12 /// implements the world `foo`.
13 ///
14 /// This structure is created through either
15 /// [`Foo::instantiate`] or by first creating
16 /// a [`FooPre`] followed by using
17 /// [`FooPre::instantiate`].
18 pub struct Foo {
19     new: wasmtime::component::Func,
20 }
21 const _: () = {
22     #[allow(unused_imports)]
23     use wasmtime::component::__internal::anyhow;
24     impl<_T> FooPre<_T> {
25         /// Creates a new copy of `FooPre` bindings which can then
26         /// be used to instantiate into a particular store.
27         ///
28         /// This method may fail if the compoennt behind `instance_pre`
29         /// does not have the required exports.
30         pub fn new(
31             instance_pre: wasmtime::component::InstancePre<_T>,
32         ) -> wasmtime::Result<Self> {
33             let _component = instance_pre.component();
34             let new = _component
35                 .export_index(None, "new")
36                 .ok_or_else(|| anyhow::anyhow!("no function export `new` found"))?
37                 .1;
38             Ok(FooPre { instance_pre, new })
39         }
40         /// Instantiates a new instance of [`Foo`] within the
41         /// `store` provided.
42         ///
43         /// This function will use `self` as the pre-instantiated
44         /// instance to perform instantiation. Afterwards the preloaded
45         /// indices in `self` are used to lookup all exports on the
46         /// resulting instance.
47         pub fn instantiate(
48             &self,
49             mut store: impl wasmtime::AsContextMut<Data = _T>,
50         ) -> wasmtime::Result<Foo> {
51             let mut store = store.as_context_mut();
52             let _instance = self.instance_pre.instantiate(&mut store)?;
53             let new = *_instance.get_typed_func::<(), ()>(&mut store, &self.new)?.func();
54             Ok(Foo { new })
55         }
56     }
57     impl Foo {
58         /// Convenience wrapper around [`FooPre::new`] and
59         /// [`FooPre::instantiate`].
60         pub fn instantiate<_T>(
61             mut store: impl wasmtime::AsContextMut<Data = _T>,
62             component: &wasmtime::component::Component,
63             linker: &wasmtime::component::Linker<_T>,
64         ) -> wasmtime::Result<Foo> {
65             let pre = linker.instantiate_pre(component)?;
66             FooPre::new(pre)?.instantiate(store)
67         }
68         pub fn call_new<S: wasmtime::AsContextMut>(
69             &self,
70             mut store: S,
71         ) -> wasmtime::Result<()> {
72             let callee = unsafe {
73                 wasmtime::component::TypedFunc::<(), ()>::new_unchecked(self.new)
74             };
75             let () = callee.call(store.as_context_mut(), ())?;
76             callee.post_return(store.as_context_mut())?;
77             Ok(())
78         }
79     }
80 };
81