# waPC Guest SDK
The waPC Guest SDK is used by Rust developers building workloads for the `wasm32-unknown-unknown` target that will conform to the [waPC](https://wascap.io/comms) (WebAssembly Procedure Calls) specification.
This crate is used by [waSCC](https://wascc.dev) as a foundation for its secure, dynamic binding of cloud capabilities on top of the **waPC** spec.
# Example
```rust
extern crate wapc_guest as guest;
use guest::prelude::*;
wapc_handler!(handle_wapc);
pub fn handle_wapc(operation: &str, msg: &[u8]) -> CallResult {
match operation {
"sample:Guest!Hello" => hello_world(msg),
_ => Err("bad dispatch".into()),
}
}
fn hello_world(
_msg: &[u8]) -> CallResult {
let _res = host_call("myBinding", "sample:Host", "Call", b"hello")?;
Ok(vec![])
}
```