Template generics #2200
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Template generics #2200
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zygoloid
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| ## Abstract | ||
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| Add template generics, with optional constraints but no SFINAE, to Carbon. | ||
| Template generics allows the compiler postpone type checking of expressions |
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Not sure I have a better word to suggest, but "allows" seems misleading here. This is more "requires" I think?
But more broadly, I wonder if we should put the emphasis differently, on the user instead of the compiler, maybe something like: template generics allows a developer to write code against the interface of a family of types that share a common API, even if the specific types are not known where the template is defined and the API is not formally defined.
Co-authored-by: Richard Smith <richard@metafoo.co.uk>
zygoloid
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Co-authored-by: Richard Smith <richard@metafoo.co.uk>
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Co-authored-by: Richard Smith <richard@metafoo.co.uk>
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chandlerc
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Nov 17, 2022
Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
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First step in updating `docs/design/generics/details.md`. It incorporates changes from proposals: #989 #2138 #2173 #2200 #2360 #2964 #3162 , but there are still more changes from those proposals to be made. It also switches away from suggesting static-dispatch witness tables, and creates an appendix to describe that decision. --------- Co-authored-by: Richard Smith <richard@metafoo.co.uk>
This was referenced Sep 22, 2023
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Includes proposals: - #990 - #2188 - #2138 - #2200 - #2360 - #2760 - #2964 - #3162 Also tries to use more precise language when talking about: - implementations, to avoid confusing `impl` declaration and definitions with the `impls` operator used in `where` clauses, an issue brought up in #2495 and #2483; - "binding patterns", like `x: i32`, and "bindings" like `x`. --------- Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
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Continued from part 1: #3231. Second step updating `docs/design/generics/details.md`. There remains some work to incorporate proposal #2200. - The biggest changes are incorporating much of the text of proposals: - #2173 - #2687 - It incorporates changes from proposals: - #989 - #1178 - #2138 - #2200 - #2360 - #2964 - #3162 - It also updates the text to reflect the latest thinking from leads issues: - #996 - #2153 -- most notably deleting the section on `TypeId`. - Update to rule for prioritization blocks with mixed type structures from [discussion on 2023-07-18](https://docs.google.com/document/d/1gnJBTfY81fZYvI_QXjwKk1uQHYBNHGqRLI2BS_cYYNQ/edit?resourcekey=0-ql1Q1WvTcDvhycf8LbA9DQ#heading=h.7jxges9ojgy3) - Adds reference links to proposals, issues, and discussions relevant to the text. - Also tries to use more precise language when talking about implementations, to avoid confusing `impl` declaration and definitions with the `impls` operator used in `where` clauses, an issue brought up in - #2495 - #2483 --------- Co-authored-by: Richard Smith <richard@metafoo.co.uk>
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Add template generics, with optional constraints but no SFINAE, to Carbon. Template generics allows the compiler postpone type checking of expressions dependent on a template parameter until the function is called and the value of that parameter is known.
Example usage: