Go Generics type signature for ensuring argument is a pointer

deref.go

// https://go.dev/play/p/BT-OUMK5Rtp

package main

import (
	"fmt"
)

// Deref will dereference a generic pointer.
// It will fail at compile time if pt is not a pointer.
// This is useful for functions that require pointers to structs and not structs directly.
func Deref[T any](ptr *T) T {
	return *ptr
}

func main() {
	var test = "test"
	var num = 1
	a, b, c := &test, &num, &[]float64{2.0}
	A, B, C := Deref(a), Deref(b), Deref(c)
	fmt.Printf("%#v, %#v, %#v\n", A, B, C)
	// Deref(C) // this will fail at compile time because C is not a pointer
}