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@@ -16,7 +16,34 @@
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}(this, function () {
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function Queue() {
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+ this.tail = [];
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+ this.head = [].slice.call(arguments);
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+ this.offset = 0;
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}
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+ Queue.prototype.shift = function () {
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+ if (this.offset === this.head.length) {
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+ var tmp = this.head;
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+ tmp.length = 0;
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+ this.head = this.tail;
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+ this.tail = tmp;
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+ this.offset = 0;
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+ if (this.head.length === 0) return;
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+ }
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+ return this.head[this.offset++];
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+ };
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+
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+ Queue.prototype.push = function () {
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+ return [].push.apply(this.tail, arguments);
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+ };
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+
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+ Object.defineProperty(Queue.prototype, "length", {
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+ get: function () {
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+ return this.head.length - this.offset + this.tail.length;
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+ },
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+ enumerable: false,
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+ configurable: true
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+ });
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+
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return Queue;
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}));
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