// Package ptr contains some utility methods related to pointers.

package ptr

import "golang.org/x/exp/constraints"

type number interface {

constraints.Integer | constraints.Float

}

// Ref returns a reference to v.

func Ref[T any](v T) *T {

return &v

}

// NilOrEmpty returns true if s is nil or the empty string.

func NilOrEmpty(s *string) bool {

return s == nil || *s == ""

}

// NilToEmpty coalesces a nil value to the empty value.

func NilToEmpty[T any](s *T) T {

var def T

if s == nil {

return def

}

return *s

}

// NilToDefault coalesces a nil value to the provided default value.

func NilToDefault[T any](s *T, def T) T {

if s == nil {

return def

}

return *s

}

// NilOrZero returns true if v is nil or 0.

func NilOrZero[T number](v *T) bool {

return v == nil || *v == 0

}