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josh11bandJon Meow
0a93289706
- Makes `Self` a keyword
- Inside `class Foo { `... `}`, `Self` means `Foo`
- Inside `class Foo(T:! Type, U:! Type) {` ...` }`, `Self` means `Foo(T, U)`
- `impl as Bar` means `impl Self as Bar`
- Inside `external impl Foo as Bar {`...`}`, not in a scope already defining `Self`, `Self` means `Foo`
Implemented by introducing a new kind of declaration, a `SelfDeclaration`, that is automatically added to class and impl declarations.
Co-authored-by: Jon Meow <jperkins@google.com>
50 lines
1.3 KiB
Plaintext
50 lines
1.3 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// RUN: %{explorer} %s 2>&1 | \
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// RUN: %{FileCheck} --match-full-lines --allow-unused-prefixes=false %s
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// RUN: %{explorer} --parser_debug --trace_file=- %s 2>&1 | \
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// RUN: %{FileCheck} --match-full-lines --allow-unused-prefixes %s
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// AUTOUPDATE: %{explorer} %s
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// CHECK: result: 0
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package ExplorerTest api;
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interface Number {
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fn Zero() -> Self;
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fn Add[me: Self](other: Self) -> Self;
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}
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class Point(T:! Number) {
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var x: T;
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var y: T;
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}
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external impl i32 as Number {
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fn Zero() -> i32 { return 0; }
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fn Add[me: i32](other: i32) -> i32 { return me + other; }
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}
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external impl forall [U:! Number] Point(U) as Number {
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// Allowed: `Self` means `Point(U)` here.
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fn Zero() -> Self { return {.x = U.Zero(), .y = U.Zero() }; }
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fn Add[me: Self](other: Self) -> Self {
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return {.x = me.x.Add(other.x), .y = me.y.Add(other.y)};
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}
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}
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fn Sum[E:! Number](x: E, y: E) -> E {
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var total: E = E.Zero();
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total = total.Add(x);
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total = total.Add(y);
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return total;
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}
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fn Main() -> i32 {
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var p: Point(i32) = {.x = 1, .y = 2};
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var q: Point(i32) = {.x = 4, .y = 3};
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var r: Point(i32) = Sum(p, q);
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return r.x - r.y;
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}
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