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This commit is contained in:
Folkert 2020-11-05 00:59:26 +01:00
parent f07e69ad87
commit 3fe0140c7e
4 changed files with 39 additions and 55 deletions
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50
examples/closure/platform/src/lib.rs
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@ -1,9 +1,7 @@
use roc_std::alloca;
use roc_std::RocCallResult;
use std::alloc::Layout;
use std::ffi::CString;
use std::os::raw::c_char;
use std::time::SystemTime;
use RocCallResult::*;
extern "C" {
#[link_name = "makeClosure_1_exposed"]
@ -53,10 +51,10 @@ pub fn rust_main() -> isize {
make_closure(buffer);
let output = &*(buffer as *mut RocCallResult<((), ())>);
let output = &*(buffer as *mut RocCallResult<()>);
match output.into() {
Ok((_, _)) => {
Ok(()) => {
let function_pointer = {
// this is a pointer to the location where the function pointer is stored
// we pass just the function pointer
@ -89,45 +87,3 @@ pub fn rust_main() -> isize {
// Exit code
0
}
#[repr(u64)]
pub enum RocCallResult<T> {
Success(T),
Failure(*mut c_char),
}
impl<T: Sized> Into<Result<T, String>> for RocCallResult<T> {
fn into(self) -> Result<T, String> {
match self {
Success(value) => Ok(value),
Failure(failure) => Err({
let raw = unsafe { CString::from_raw(failure) };
let result = format!("{:?}", raw);
// make sure rust does not try to free the Roc string
std::mem::forget(raw);
result
}),
}
}
}
impl<T: Sized + Copy> Into<Result<T, String>> for &RocCallResult<T> {
fn into(self) -> Result<T, String> {
match self {
Success(value) => Ok(*value),
Failure(failure) => Err({
let raw = unsafe { CString::from_raw(*failure) };
let result = format!("{:?}", raw);
// make sure rust does not try to free the Roc string
std::mem::forget(raw);
result
}),
}
}
}