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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>
65 lines
1.8 KiB
Plaintext
65 lines
1.8 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/10
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import Core library "io";
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import Core library "range";
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import library "day10_common";
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import library "io_utils";
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class PathsToTop {
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impl as Core.UnformedInit {}
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fn Make(terrain: Terrain) -> PathsToTop {
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returned var me: PathsToTop;
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for (y: i32 in Core.Range(43)) {
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for (x: i32 in Core.Range(43)) {
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// TODO: We shouldn't need an explicit cast here.
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me.paths[x][y] =
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if terrain.height[x][y] == 9 then 1 as i64 else 0;
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}
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}
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return var;
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}
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fn AddLevel(ref self, terrain: Terrain, level: i32) -> i64 {
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var total: i64 = 0;
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let adj: array((i32, i32), 4) = ((-1, 0), (0, -1), (1, 0), (0, 1));
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for (y: i32 in Core.Range(43)) {
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for (x: i32 in Core.Range(43)) {
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if (terrain.height[x][y] == level) {
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var paths: i64 = 0;
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// TODO: for ((adj_x: i32, adj_y: i32) in adj) {
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for (i: i32 in Core.Range(4)) {
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let adj_x: i32 = x + adj[i].0;
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let adj_y: i32 = y + adj[i].1;
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if (adj_x >= 0 and adj_x < 43 and
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adj_y >= 0 and adj_y < 43 and
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terrain.height[adj_x][adj_y] == level + 1) {
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paths += self.paths[adj_x][adj_y];
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}
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}
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self.paths[x][y] = paths;
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total += paths;
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}
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}
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}
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return total;
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}
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var paths: array(array(i64, 43), 43);
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}
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fn Run() {
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var terrain: Terrain = Terrain.Read();
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var paths: PathsToTop = PathsToTop.Make(terrain);
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var total: i64;
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for (i: i32 in Core.InclusiveRange(0, 8)) {
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total = paths.AddLevel(terrain, 8 - i);
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}
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PrintInt(total);
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}
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