klingtnet/go-generics

Random thoughs and notes about Go's generics proposal

Go Generics Playground

Run build-go2go.sh to compile a Go distribution with go2go support. Here's a list of resources to refer to when having questions about generics draft:

• Generics proposal blog post
• various example packages using generics
• Type Parameters (Generics) Draft
• go2go README

Note that generics source files use a .go2 file extension.

$ go tool go2go
Usage: go2go <command> [arguments]

The commands are:

	build      translate and build packages
	run        translate and run list of files
	test       translate and test packages
	translate  translate .go2 files into .go files

Tool usage examples:

$ go tool go2go test chans
ok  	chans	(cached)
$ go tool go2go translate chans; ls $GO2PATH/src/chans/*.go
./goroot/src/cmd/go2go/testdata/go2path/src/chans/chans.go
./goroot/src/cmd/go2go/testdata/go2path/src/chans/chans_test.go

• go tool go2go does not support -v and other test flags yet
• it looks like all go2go subcommands were copied from go list:

$ go tool go2go test -h
usage: go list [-f format] [-json] [-m] [list flags] [build flags] [packages]
Run 'go help list' for details.
./goroot/bin/go list "-h" failed: exit status 2

• any is a shorthand for interface{}
• in a type parameter list the type parameter name is uppercased, e.g. func f[T constraint](x T) {}