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Change the field_offsets() function to a FIELD_OFFSETS associated const

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This commit is contained in:
Olivier Goffart 2020-08-03 16:04:55 +02:00
parent de188e0a54
commit 1bfd708784
10 changed files with 156 additions and 156 deletions
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10
helper_crates/const-field-offset/src/lib.rs
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@ -359,7 +359,7 @@ mod tests {
#[test]
fn test_simple() {
// Get a pointer to `b` within `Foo`
let foo_b = Foo::field_offsets().b;
let foo_b = Foo::FIELD_OFFSETS.b;
// Construct an example `Foo`
let mut x = Foo { a: 1, b: 2.0, c: false };
@ -384,7 +384,7 @@ mod tests {
let mut x = Bar { x: 0, y: Foo { a: 1, b: 2.0, c: false } };
// Combine the pointer-to-members
let bar_y_b = Bar::field_offsets().y + Foo::field_offsets().b;
let bar_y_b = Bar::FIELD_OFFSETS.y + Foo::FIELD_OFFSETS.b;
// Apply the pointer to get at `b` and mutate it
{
@ -398,17 +398,17 @@ mod tests {
fn test_pin() {
use ::alloc::boxed::Box;
// Get a pointer to `b` within `Foo`
let foo_b = Foo::field_offsets().b;
let foo_b = Foo::FIELD_OFFSETS.b;
let foo_b_pin = unsafe { foo_b.as_pinned_projection() };
let foo = Box::pin(Foo { a: 21, b: 22.0, c: true });
let pb: Pin<&f64> = foo_b_pin.apply_pin(foo.as_ref());
assert!(*pb == 22.0);
let mut x = Box::pin(Bar { x: 0, y: Foo { a: 1, b: 52.0, c: false } });
let bar_y_b = Bar::field_offsets().y + foo_b_pin;
let bar_y_b = Bar::FIELD_OFFSETS.y + foo_b_pin;
assert!(*bar_y_b.apply(&*x) == 52.0);
let bar_y_pin = unsafe { Bar::field_offsets().y.as_pinned_projection() };
let bar_y_pin = unsafe { Bar::FIELD_OFFSETS.y.as_pinned_projection() };
*(bar_y_pin + foo_b_pin).apply_pin_mut(x.as_mut()) = 12.;
assert!(x.y.b == 12.0);
}