allows WaitIO() to reuse the []OpResult slice #19
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每次调用
WaitIO()
都会新创建一个[]OpResult
小对象,对性能造成一定影响;这个PR修改了WaitIO()
的接口,允许用户传入一个预先分配好的slice,从而避免每次重新创建。甚至用户可以直接重用返回的slice