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Simplify examples: avoid unnecessary HostRef wrap/unwrap

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Several of the examples wrap the Instance in a HostRef, only to
immediately borrow it again to get the exports,and then never touch it
again. Simplify this by owning the Instance directly.
This commit is contained in:
Josh Triplett
2019-11-19 21:01:09 -08:00
committed by Jakub Konka
parent 204b4d376a
commit 7c8ac3d71c
4 changed files with 10 additions and 21 deletions
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9
crates/api/examples/multi.rs
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@@ -1,7 +1,6 @@
//! Translation of multi example
use anyhow::{ensure, format_err, Context as _, Result};
use std::cell::Ref;
use std::rc::Rc;
use wasmtime::*;
@@ -68,14 +67,12 @@ fn main() -> Result<()> {
// Instantiate.
println!("Instantiating module...");
let imports = vec![callback_func.into()];
let instance = HostRef::new(
Instance::new(&store, &module, imports.as_slice())
.context("Error instantiating module!")?,
);
let instance = Instance::new(&store, &module, imports.as_slice())
.context("Error instantiating module!")?;
// Extract exports.
println!("Extracting export...");
let exports = Ref::map(instance.borrow(), |instance| instance.exports());
let exports = instance.exports();
ensure!(!exports.is_empty(), "Error accessing exports!");
let g = exports[0].func().context("> Error accessing export $g!")?;
let round_trip_many = exports[1]