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|
//! This tests that we compute the same hash as `derive(Hash)`.
#[cfg(feature = "use_core")]
extern crate core;
#[macro_use]
extern crate derivative;
macro_rules! define {
($kw:tt $($rest:tt)*) => {
#[derive(Derivative)]
#[derivative(Hash)]
$kw Ours $($rest)*
#[derive(Hash)]
$kw Theirs $($rest)*
}
}
struct FakeHasher<'a>(&'a mut Vec<u8>);
impl<'a> ::std::hash::Hasher for FakeHasher<'a> {
fn finish(&self) -> u64 {
unimplemented!()
}
fn write(&mut self, bytes: &[u8]) {
self.0.extend(bytes);
}
}
fn fake_hash<E: ::std::hash::Hash>(e: E) -> Vec<u8> {
let mut v = Vec::new();
e.hash(&mut FakeHasher(&mut v));
v
}
#[test]
fn main() {
{
define! {
struct;
}
assert_eq!(fake_hash(Ours), fake_hash(Theirs));
}
{
define! {
struct {
foo: u8
}
}
assert_eq!(fake_hash(Ours { foo: 0 }), fake_hash(Theirs { foo: 0 }));
assert_eq!(fake_hash(Ours { foo: 42 }), fake_hash(Theirs { foo: 42 }));
}
{
define! {
struct<'a> {
foo: u8,
bar: &'a str,
}
}
assert_eq!(fake_hash(Ours { foo: 0, bar: "bar" }), fake_hash(Theirs { foo: 0, bar: "bar" }));
assert_eq!(fake_hash(Ours { foo: 42, bar: "bar" }), fake_hash(Theirs { foo: 42, bar: "bar" }));
}
{
define! {
struct<'a> (u8, &'a str);
}
assert_eq!(fake_hash(Ours ( 0, "bar" )), fake_hash(Theirs ( 0, "bar" )));
assert_eq!(fake_hash(Ours ( 42, "bar" )), fake_hash(Theirs ( 42, "bar" )));
}
{
define! {
enum {
A, B, C
}
}
assert_eq!(fake_hash(Ours::A), fake_hash(Theirs::A));
assert_eq!(fake_hash(Ours::B), fake_hash(Theirs::B));
assert_eq!(fake_hash(Ours::C), fake_hash(Theirs::C));
}
{
define! {
enum {
A, B = 42, C
}
}
assert_eq!(fake_hash(Ours::A), fake_hash(Theirs::A));
assert_eq!(fake_hash(Ours::B), fake_hash(Theirs::B));
assert_eq!(fake_hash(Ours::C), fake_hash(Theirs::C));
}
{
define! {
enum {
A, B = 42, C=1
}
}
assert_eq!(fake_hash(Ours::A), fake_hash(Theirs::A));
assert_eq!(fake_hash(Ours::B), fake_hash(Theirs::B));
assert_eq!(fake_hash(Ours::C), fake_hash(Theirs::C));
}
{
#[derive(Derivative)]
#[derivative(Hash)]
struct Ours<'a> {
foo: u8,
#[derivative(Hash="ignore")]
bar: &'a str,
baz: i64,
}
#[derive(Hash)]
struct Theirs {
foo: u8,
baz: i64,
}
assert_eq!(fake_hash(Ours { foo: 0, bar: "bar", baz: 312 }), fake_hash(Theirs { foo: 0, baz: 312 }));
assert_eq!(fake_hash(Ours { foo: 42, bar: "bar", baz: 312 }), fake_hash(Theirs { foo: 42, baz: 312 }));
}
}
|
