55 lines
2.3 KiB
Markdown
55 lines
2.3 KiB
Markdown
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# C# Design Meeting Notes for May 25, 2015
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Discussion for these notes can be found in https://github.com/dotnet/roslyn/issues/3912.
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## Agenda
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Today we went through a bunch of the proposals on GitHub and triaged them for our list of features in issue #2136. Due to the vastness of the list, we needed to use *some* criterion to sort by, and though far from ideal we ordered them by number of comments, most to least.
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Here's where we landed, skipping things that were already "Strong interest". Some are further elaborated in sections below.
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1. Method contracts <*Stay at "Some interest"*>(#119)
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2. Destructible types <*Stay at "Probably never"*> (#161)
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3. Params IEnumerable <*Stay at "Small but Useful*>(#36)
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4. Multiple returns <*Addressed by tuples. Close.*> (#102)
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5. More type inference <*Not a coherent proposal. Close*> (#17)
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6. Readonly parameters and locals <*Stay at "Some interest"*>(#115)
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7. Implicitly typed lambdas <*Add at "Probably never"*>(#14)
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8. Immutable types <*Stay at "Some interest*>(#159)
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9. Object initializers for immutable objects <*Add at "Some interest"*>(#229)
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10. First item is special <*Add at "Never"*>(#131)
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11. Array slices <*Keep at "Interesting but needs CLR support"*>(#120)
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12. Vararg calling convention <*Merge with params IEnumerable*>(#37)
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13. XML Literals <*Add to "Never"*>(#1746)
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14. Local Functions <*Move to "Some interest*>(#259)
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15. Covariant returns <*Stay at "Some interest*>(#357)
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# Params IEnumerable
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This needs more thinking - let's not just implement the straightforward design. There are perf issues, for instance, around implementing through the `IEnumerable<T>` interface instead of arrays directly.
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# More type inference
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Not a coherent proposal. But even if there was one, we probably wouldn't want it in C#.
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# Implicitly typed lambdas
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These are mostly subsumed by local functions, which we'd rather do. It has some individual usefulness but not much synergy.
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# Object initializers for immutable objects
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We want to think this together with withers, not sure what form it would take.
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# first item in loops is special
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We recognize the scenario but it's not worthy of a feature.
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# vararg calling convention
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Roll it in with params IEnumerable discussion for investigation.
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# XML literals
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Never! We won't bake in a specific format.
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