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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>
67 lines
1.5 KiB
Plaintext
67 lines
1.5 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/2
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import Core library "io";
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import library "day2_common";
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import library "io_utils";
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class ReportState {
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fn Make() -> ReportState {
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return {.levels_so_far = 0, .previous = 0,
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.increasing = false, .safe_so_far = true};
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}
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fn Add(ref self, level: i32) {
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++self.levels_so_far;
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if (self.levels_so_far >= 2) {
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if (not IsSafeDelta(self.previous, level)) {
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// Difference is zero or too large.
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self.safe_so_far = false;
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}
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var is_increase: bool = level > self.previous;
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if (self.levels_so_far == 2) {
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self.increasing = is_increase;
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} else if (is_increase != self.increasing) {
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// Not monotone.
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self.safe_so_far = false;
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}
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}
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self.previous = level;
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}
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var levels_so_far: i32;
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var previous: i32;
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var increasing: bool;
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var safe_so_far: bool;
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}
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fn ReadReport() -> ReportState {
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returned var report: ReportState = ReportState.Make();
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var n: i32;
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while (ReadInt(ref n)) {
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report.Add(n);
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SkipSpaces();
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}
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return var;
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}
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fn Run() {
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var safe_reports: i32 = 0;
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while (true) {
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var report: ReportState = ReadReport();
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if (report.levels_so_far == 0) {
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break;
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}
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if (report.safe_so_far) {
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++safe_reports;
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}
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SkipNewline();
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}
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Core.Print(safe_reports);
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}
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