mirror of
https://github.com/golang/go
synced 2024-11-24 17:40:14 -07:00
e24977d231
The next CL will remove the -G flag, effectively hard-coding it to its current default (-G=3). Change-Id: Ib4743b529206928f9f1cca9fdb19989728327831 Reviewed-on: https://go-review.googlesource.com/c/go/+/388534 Reviewed-by: Keith Randall <khr@golang.org> Trust: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
56 lines
1.0 KiB
Go
56 lines
1.0 KiB
Go
// run
|
|
|
|
// Copyright 2021 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package main
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
)
|
|
|
|
type Option[T any] struct {
|
|
ok bool
|
|
val T
|
|
}
|
|
|
|
func (o Option[T]) String() string {
|
|
if o.ok {
|
|
return fmt.Sprintf("Some(%v)", o.val)
|
|
}
|
|
return "None"
|
|
}
|
|
|
|
func Some[T any](val T) Option[T] { return Option[T]{ok: true, val: val} }
|
|
func None[T any]() Option[T] { return Option[T]{ok: false} }
|
|
|
|
type Result[T, E any] struct {
|
|
ok bool
|
|
val T
|
|
err E
|
|
}
|
|
|
|
func (r Result[T, E]) String() string {
|
|
if r.ok {
|
|
return fmt.Sprintf("Ok(%v)", r.val)
|
|
}
|
|
return fmt.Sprintf("Err(%v)", r.err)
|
|
}
|
|
|
|
func Ok[T, E any](val T) Result[T, E] { return Result[T, E]{ok: true, val: val} }
|
|
func Err[T, E any](err E) Result[T, E] { return Result[T, E]{ok: false, err: err} }
|
|
|
|
func main() {
|
|
a := Some[int](1)
|
|
b := None[int]()
|
|
fmt.Println(a, b)
|
|
|
|
x := Ok[int, error](1)
|
|
y := Err[int, error](errors.New("test"))
|
|
fmt.Println(x, y)
|
|
// fmt.Println(x)
|
|
_, _, _, _ = a, b, x, y
|
|
}
|