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mkfsn/ref.go

Created December 26, 2021 09:19
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Go Generics Reference function to any type
Raw
ref.go
// https://go.dev/play/p/Yrwl1kVfvXi?v=gotip
package main
import (
"fmt"
"time"
)
type Ptr[T any] interface {
*T
}
// Ref returns the reference of T.
//
// Or this also works:
// func Ref[T any](t T) *T {
// return &t
// }
func Ref[T any, PtrT Ptr[T]](t T) PtrT {
return &t
}
func PrintPtr[T any, PtrT Ptr[T]](ptr PtrT) {
fmt.Printf("%T: v=%p *v=%v\n", ptr, ptr, *ptr)
}
type Point struct {
x, y float64
}
func main() {
PrintPtr(Ref(42))
PrintPtr(Ref(59.3))
PrintPtr(Ref("Hello World"))
PrintPtr(Ref(time.Now()))
PrintPtr(Ref(Point{3.0, 4.0}))
}
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