Holder.kt

open class Holder<out T: Any, in A>(creator: (A) -> T) {
    private var creator: ((A) -> T)? = creator
    @Volatile private var instance: T? = null

    fun instance(arg: A): T {
        val ins = instance
        if (ins != null) {
            return ins
        }

        return synchronized(this) {
            val ins2 = instance
            if (ins2 != null) {
                ins2
            } else {
                val created = creator!!(arg)
                instance = created
                creator = null
                created
            }
        }
    }
}

//usage
class FooManager private constructor(context: Context) {
    init {
        // Init using context argument
    }
    companion object : Holder<Manager, Context>(::FooManager)
}

FooManager.instance(context)