package component

import "sync"

type Elem[E any] struct {
	Init        func() E
	initializer sync.Once
	done        bool
	elem        E
}

func NewElem[E any](init func() E) *Elem[E] {
	return &Elem[E]{Init: init}
}

func (c *Elem[E]) Get() E {
	if c.done {
		return c.elem
	}
	c.initializer.Do(func() {
		c.elem = c.Init()
		c.done = true
	})
	return c.elem
}