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Typing Generic Go
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- 1 Intro
- 2 Type parameters draft design
- 3 A type parameter list
- 4 Type parameters to the rescue
- 5 Constraints • A constraint specifies the requirements which a type argument must satisfy
- 6 Declaration and scope of type parameters type parameter declaration
- 7 Type-checking the Sort call: Instantiation
- 8 Type-checking the Sort call: Invocation
- 9 Type-checking a generic call 1 Instantiation (new) • replace type parameters with type arguments in entire signature • verify that each type argument satisfies its constraint
- 10 Separating instantiation from invocation booksort :- Sort[book] // == #Sort book booksort (bookshelf)
- 11 Sort internals
- 12 Type-checking a generic call (refined) 1. If no type arguments are provided: Use argument type inference to infer type arguments.
- 13 What is missing? So far, constraints can only describe method requirements.
- 14 Type lists A constraint interface may have a list of types (besides methods)
- 15 Satisfying a type list An argument type satisfies a constraint with a type list if
- 16 Different type parameters are different types
- 17 Example: Combining byte and string operations type Bytes interface type []byte, string
- 18 Example: Relationships between type parameters type Pointer T any interface The type argument for PT must be a
- 19 Summary Declarations Type parameter lists are like ordinary parameter lists with TT • Function and type declarations may have type parameter lists • Type parameters are constrained by interfaces
- 20 How happy are we with this design? • Type parameters • Interfaces as constraints • Type lists in interfaces
- 21 With great power comes great responsibility • Type parameters ('generics ) are a new tool in the toolset of Go. • Orthogonal to the rest of the language. • Orthogonality opens a new dimension of codi…
- 22 Examples (1)
- 23 When to use generics
- 24 Next steps The Go team is actively pursuing a real implementation (in a branch) so we can iron out any outstanding open problems.
