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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>
46 lines
965 B
Plaintext
46 lines
965 B
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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import Core library "io";
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import Core library "range";
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// Compute and return the number of primes less than 1000.
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class Sieve {
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impl as Core.UnformedInit {}
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fn Make() -> Sieve {
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returned var s: Sieve;
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for (n: i32 in Core.Range(1000)) {
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s.is_prime[n] = true;
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}
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return var;
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}
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fn MarkMultiplesNotPrime(ref self, p: i32) {
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var n: i32 = p * 2;
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while (n < 1000) {
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self.is_prime[n] = false;
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n += p;
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}
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}
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var is_prime: array(bool, 1000);
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}
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fn Run() -> i32 {
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var s: Sieve = Sieve.Make();
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var number_of_primes: i32 = 0;
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for (n: i32 in Core.InclusiveRange(2, 999)) {
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if (s.is_prime[n]) {
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++number_of_primes;
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Core.Print(n);
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s.MarkMultiplesNotPrime(n);
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}
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}
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return number_of_primes;
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}
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