defer.go

defer.go

package tkt

import (
	"sync"
)

type Deferred[T any] interface {
	Get() T
}

func Defer[T any](compute func() T) Deferred[T] {
	return &deferred[T]{compute: compute}
}

type deferred[T any] struct {
	once    sync.Once
	value   T
	compute func() T
}

func (d *deferred[T]) Get() T {
	d.once.Do(func() {
		d.value = d.compute()
	})
	return d.value
}