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use terrors::OneOf;
#[derive(Debug)]
struct NotEnoughMemory;
#[derive(Debug)]
struct Timeout;
#[derive(Debug)]
struct RetriesExhausted;
#[test]
fn retry() {
fn inner() -> Result<(), OneOf<(NotEnoughMemory, RetriesExhausted)>> {
for _ in 0..3 {
let Err(err) = does_stuff() else {
return Ok(());
};
match err.narrow::<Timeout, _>() {
Ok(_timeout) => continue,
Err(allocation_oneof) => {
println!("didn't get Timeout, now trying to get NotEnoughMemory");
let allocation_oneof: OneOf<(NotEnoughMemory,)> = allocation_oneof;
let allocation = allocation_oneof.narrow::<NotEnoughMemory, _>().unwrap();
return Err(OneOf::new(allocation));
}
}
}
Err(OneOf::new(RetriesExhausted))
}
let _ = dbg!(inner());
}
fn does_stuff() -> Result<(), OneOf<(NotEnoughMemory, Timeout)>> {
// TODO Try impl after superset type work
let _allocation = match allocates() {
Ok(a) => a,
Err(e) => return Err(e.broaden()),
};
// TODO Try impl after superset type work
let _chat = match chats() {
Ok(c) => c,
Err(e) => return Err(OneOf::new(e)),
};
Ok(())
}
fn allocates() -> Result<(), OneOf<(NotEnoughMemory,)>> {
let result: Result<(), NotEnoughMemory> = Err(NotEnoughMemory);
result?;
Ok(())
}
fn chats() -> Result<(), Timeout> {
Err(Timeout)
}
#[test]
fn smoke() {
let o_1: OneOf<(u32, String)> = OneOf::new(5_u32);
let _narrowed_1: u32 = o_1.narrow::<u32, _>().unwrap();
let o_2: OneOf<(String, u32)> = OneOf::new(5_u32);
let _narrowed_2: u32 = o_2.narrow::<u32, _>().unwrap();
let o_3: OneOf<(String, u32)> = OneOf::new("5".to_string());
let _narrowed_3: OneOf<(String,)> = o_3.narrow::<u32, _>().unwrap_err();
let o_4: OneOf<(String, u32)> = OneOf::new("5".to_string());
let _: String = o_4.narrow().unwrap();
let o_5: OneOf<(String, u32)> = OneOf::new("5".to_string());
o_5.narrow::<String, _>().unwrap();
let o_6: OneOf<(String, u32)> = OneOf::new("5".to_string());
let o_7: OneOf<(u32, String)> = o_6.broaden();
let o_8: OneOf<(String, u32)> = o_7.subset().unwrap();
let _: OneOf<(u32, String)> = o_8.subset().unwrap();
let o_9: OneOf<(u8, u16, u32)> = OneOf::new(3_u32);
let _: Result<OneOf<(u16,)>, OneOf<(u8, u32)>> = o_9.subset();
let o_10: OneOf<(u8, u16, u32)> = OneOf::new(3_u32);
let _: Result<u16, OneOf<(u8, u32)>> = o_10.narrow();
}
#[test]
fn debug() {
use std::error::Error;
use std::io;
let o_1: OneOf<(u32, String)> = OneOf::new(5_u32);
// Debug is implemented if all types in the type set implement Debug
dbg!(&o_1);
// Display is implemented if all types in the type set implement Display
println!("{}", o_1);
type E = io::Error;
let e = io::Error::new(io::ErrorKind::Other, "wuaaaaahhhzzaaaaaaaa");
let o_2: OneOf<(E,)> = OneOf::new(e);
// std::error::Error is implemented if all types in the type set implement it
dbg!(o_2.source());
let o_3: OneOf<(u32, String)> = OneOf::new("hey".to_string());
dbg!(o_3);
}
#[test]
fn multi_match() {
use terrors::E2;
let o_1: OneOf<(u32, String)> = OneOf::new(5_u32);
match o_1.as_enum() {
E2::A(u) => {
println!("handling {u}: u32")
}
E2::B(s) => {
println!("handling {s}: String")
}
}
match o_1.to_enum() {
E2::A(u) => {
println!("handling {u}: u32")
}
E2::B(s) => {
println!("handling {s}: String")
}
}
}
#[test]
fn multi_narrow() {
use terrors::E2;
struct Timeout {}
struct Backoff {}
let o_1: OneOf<(u8, u16, u32, u64, u128)> = OneOf::new(5_u32);
let _narrow_res: Result<OneOf<(u8, u128)>, OneOf<(u16, u32, u64)>> = o_1.subset();
let o_2: OneOf<(u8, u16, Backoff, Timeout, u32, u64, u128)> = OneOf::new(Timeout {});
match o_2.subset::<(Timeout, Backoff), _>().unwrap().to_enum() {
E2::A(Timeout {}) => {
println!(":)");
}
E2::B(Backoff {}) => {
unreachable!()
}
}
}
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