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Richard Smith
b8814f6c80
Also add a default for `EqWith.NotEqual`. Switch advent examples to use these named constraints, and also go through all the other TODOs in the advent examples and fix the ones that are trivially fixable now.
61 lines
1.9 KiB
Plaintext
61 lines
1.9 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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package Core library "prelude/operators/comparison";
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export import library "prelude/types/bool";
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import library "prelude/copy";
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import library "prelude/types/int_literal";
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// Equality comparison: `a == b` and `a != b`.
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interface EqWith(Other: type) {
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fn Equal(self, other: Other) -> bool;
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default fn NotEqual(self, other: Other) -> bool {
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return not self.Equal(other);
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}
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}
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constraint Eq {
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extend require impls EqWith(Self);
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}
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// Relational comparison: `a < b`, `a <= b`, `a > b`, `a >= b`.
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interface OrderedWith(Other: type) {
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// TODO: fn Compare
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// TODO: Each of the below should be a `default fn` implemented in terms of
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// Compare.
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fn Less(self, other: Other) -> bool;
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fn LessOrEquivalent(self, other: Other) -> bool;
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fn Greater(self, other: Other) -> bool;
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fn GreaterOrEquivalent(self, other: Other) -> bool;
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}
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constraint Ordered {
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extend require impls OrderedWith(Self);
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}
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// Equality comparison for `bool`.
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// Note that this must be provided in this library as `bool` doesn't have any
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// associated libraries of its own.
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impl bool as EqWith(Self) {
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fn Equal(self, other: Self) -> bool = "bool.eq";
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fn NotEqual(self, other: Self) -> bool = "bool.neq";
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}
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// Operations for IntLiteral. These need to be here because IntLiteral has no
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// associated library of its own.
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impl IntLiteral as EqWith(Self) {
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fn Equal(self, other: Self) -> bool = "int.eq";
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fn NotEqual(self, other: Self) -> bool = "int.neq";
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}
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impl IntLiteral as OrderedWith(Self) {
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// TODO: fn Compare
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fn Less(self, other: Self) -> bool = "int.less";
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fn LessOrEquivalent(self, other: Self) -> bool = "int.less_eq";
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fn Greater(self, other: Self) -> bool = "int.greater";
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fn GreaterOrEquivalent(self, other: Self) -> bool = "int.greater_eq";
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}
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