proc `=copy`[T](dest: var SpscQueue[T]; source: SpscQueue[T]) {.error.}

proc `=destroy`[T](self: var SpscQueue[T])

proc cap[T](self: SpscQueue[T]): int

proc init[T](self: out SpscQueue[T]; capacity: Natural)

proc len[T](self: SpscQueue[T]): int

proc newSpscQueue[T](cap: int): SpscQueue[T]

proc tryPop[T](self: var SpscQueue[T]; value: var T): bool

proc tryPush[T](self: var SpscQueue[T]; value: var Isolated[T]): bool {.
    nodestroy.}

template tryPush[T](self: SpscQueue[T]; value: T): bool