Method func_new

crates/wasmtime/src/runtime/component/linker.rs:700–710

Define a new host-provided function using dynamically typed values. The `name` provided is the name of the function to define and the `func` provided is the host-defined closure to invoke when this function is called. This function is the "dynamic" version of defining a host function as compared to [`LinkerInstance::func_wrap`]. With [`LinkerInstance::func_wrap`] a function's type is statically

(
        &mut self,
        name: &str,
        func: impl Fn(StoreContextMut<'_, T>, types::ComponentFunc, &[Val], &mut [Val]) -> Result<()>
        + Send
        + Sync
        + 'static,
    )

    /// memory allocation fails. See the `OutOfMemory` type's documentation for
    /// details on Wasmtime's out-of-memory handling.
    pub fn func_new(
        &mut self,
        name: &str,
        func: impl Fn(StoreContextMut<'_, T>, types::ComponentFunc, &[Val], &mut [Val]) -> Result<()>
        + Send
        + Sync
        + 'static,
    ) -> Result<()> {
        self.insert(name, Definition::Func(HostFunc::func_new(func)?))?;
        Ok(())
    }

    /// Define a new host-provided async function using dynamic types.
    ///