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This proposal defines the very basics of `class` types, primarily focused on:
- use cases including: data classes, encapsulated types, inheritance with and without `virtual`, interfaces as base classes, and mixins for code reuse;
- anonymous data types for called _structural data classes_ or _struct types_. Struct literals are used to initialize class values and ad-hoc parameter and return types with named components; and
- future work, including the provisional syntax already in use for features that have not been decided.
The intent is to both make some small incremental progress and get agreement on direction. As such it doesn't include things like nominal types, methods, access control, inheritance, etc.
It proposes this struct type and literal syntax:
```
var p: {.x: Int, .y: Int} = {.x = 0, .y = 1};
```
Note that it uses commas (`,`) between fields instead of semicolons (`;`), and no introducer for types or literal values.
Incorporates decisions from #665 , #653 , #651
Co-authored-by: Geoff Romer <gromer@google.com>
Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
Docs
This directory contains current, accepted documentation underpinning Carbon. These documents cover all aspects of Carbon ranging from the project down to detailed designs for specific language features.
If you're trying to learn more about Carbon, we recommend starting at /README.md.