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Jon Ross-Perkins
0722dab0ef
This changes `Destroy` to use an interface for its implementation. Note that this change includes a lot of test updates. Even when `Destroy` is a no-op, it still causes code generation as part of determining that. Originally I was trying to use ranges to cut down the scope of this, and to a degree I think they have. But a flipside here is that cases where no destructors should be generated -- particularly globals -- would be needed to completely remove destructor calls. Even for ranges, the range can often include the destructor placement. So I've shifted frame-of-thought a little: accept a bunch of destructor churn, because destructors are needed and will be prevalent. The verbosity is a feature of the design to make desugaring apparent in IR, not a bug.
48 lines
1.4 KiB
Plaintext
48 lines
1.4 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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// TODO: This library is not part of the design. Either write a matching
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// proposal or remove this.
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package Core library "range";
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import library "prelude/destroy";
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import library "prelude/iterate";
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import library "prelude/operators/arithmetic";
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import library "prelude/operators/as";
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import library "prelude/operators/comparison";
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import library "prelude/types/int";
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import library "prelude/types/int_literal";
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import library "prelude/types/optional";
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class IntRange(N:! IntLiteral()) {
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fn Make(start: Int(N), end: Int(N)) -> Self {
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return {.start = start, .end = end};
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}
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impl as Iterate where .CursorType = Int(N) and .ElementType = Int(N) {
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fn NewCursor[self: Self]() -> Int(N) { return self.start; }
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fn Next[self: Self](cursor: Int(N)*) -> Optional(Int(N)) {
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var value: Int(N) = *cursor;
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if (value < self.end) {
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++*cursor;
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return Optional(Int(N)).Some(value);
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} else {
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return Optional(Int(N)).None();
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}
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}
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}
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private var start: Int(N);
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private var end: Int(N);
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}
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fn Range(end: i32) -> IntRange(32) {
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return IntRange(32).Make(0, end);
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}
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fn InclusiveRange(start: i32, end: i32) -> IntRange(32) {
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return IntRange(32).Make(start, end + 1);
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}
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