generic utils

generics.go

package main

import (
	"encoding/json"
	"fmt"
	"os"
)

func bar() (int, error) { return 2, fmt.Errorf("testerr") }

func main() {
	must(bar())("bar")
}

func must[T any](ret T, err error) func(s string) T {
	return func(s string) T {
		if err != nil {
			fmt.Printf("%s failed: %s", s, err)
			os.Exit(1)
		}
		return ret
	}
}

func deepCopy[T any](de *T) *T {
	b, _ := json.Marshal(de)
	var ret T
	_ = json.Unmarshal(b, &ret)
	return &ret
}

// https://pkg.go.dev/cmp#Or
// Or returns the first of its arguments that is not equal to the zero value.
// If no argument is non-zero, it returns the zero value.
func Or[T comparable](vals ...T) T {
	var zero T
	for _, val := range vals {
		if val != zero {
			return val
		}
	}
	return zero
}