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Chandler Carruthandjosh11b
7871237c15
Implements proposal #7016: `self` moves from the deduced implicit list (`fn F[self: Self]()`) to the front of the explicit list. Its type may be written explicitly (`fn F(self: Self)`) or omitted, in which case it defaults to `Self` (`fn F(self)`, `fn F(ref self)`); `self` in the implicit list is rejected. Throughout checking, `self` is modeled as the first explicit parameter. Because a method is just a function whose first parameter is `self`, it can also be called as an ordinary function with the receiver passed explicitly (`Type.M(obj, ...)`), not only as `obj.M(...)`. A new `SemIR::CallArgParamPatterns` helper chooses the parameters matched against the explicit arguments, excluding a leading `self` only when it is supplied as a method-call receiver; arity checking, conversion, and generic deduction use it. The resulting SemIR and lowering are unchanged: `self` is still `call_param0`, and witnesses, thunks, and vtables are unaffected. An omitted `self` type is parsed as a `SelfBindingPattern` node with no type expression; checking synthesizes the `Self` type so it behaves exactly like `self: Self`. However, the exact spelling used must match between a forward declaration and a definition, following #3763's rules around declaration matching. Generated functions, thunks, and C++ interop import/export build `self` as the first explicit parameter, and the `self`-type override (e.g. Derived->Base for a virtual override) applies to the explicit `self`. Placement is validated by new diagnostics: `SelfInImplicitParamList`, `SelfNotFirstParam`, and `SelfOutsideParamList`. The benchmark source generator and the documentation adopt the `(self)` shorthand; the prelude, the examples, and the test data are migrated in the following commits. Assisted-by: Claude Code with Claude Opus 4.7 --------- Co-authored-by: josh11b <15258583+josh11b@users.noreply.github.com>
52 lines
1.1 KiB
Plaintext
52 lines
1.1 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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// https://adventofcode.com/2024/day/14
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library "day14_common";
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import Core library "io";
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import library "io_utils";
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fn ReadXY(xy: (i32, i32)*) -> bool {
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return ReadInt(ref xy->0) and ConsumeChar(',') and ReadInt(ref xy->1);
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}
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fn SkipString(s: str) -> bool {
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return SkipNChars(s.Size() as i32);
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}
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fn Mod(a: i32, d: i32) -> i32 {
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let rem: i32 = a % d;
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return if rem < 0 then rem + d else rem;
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}
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class Robot {
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impl as Core.UnformedInit {}
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fn Read() -> Robot {
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returned var me: Robot;
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SkipString("p=");
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ReadXY(&me.p);
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SkipString(" v=");
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ReadXY(&me.v);
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SkipNewline();
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return var;
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}
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fn Pos(self, t: i32) -> (i32, i32) {
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return (Mod((self.p.0 + self.v.0 * Mod(t, 101)), 101),
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Mod((self.p.1 + self.v.1 * Mod(t, 103)), 103));
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}
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impl as Core.Copy {
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fn Op(self) -> Self {
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return {.p = self.p, .v = self.v};
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}
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}
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var p: (i32, i32);
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var v: (i32, i32);
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}
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