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/** PURE_IMPORTS_START tslib,_Subscriber,_util_ArgumentOutOfRangeError PURE_IMPORTS_END */
import * as tslib_1 from "tslib";
import { Subscriber } from '../Subscriber';
import { ArgumentOutOfRangeError } from '../util/ArgumentOutOfRangeError';
export function skipLast(count) {
    return function (source) { return source.lift(new SkipLastOperator(count)); };
}
var SkipLastOperator = /*@__PURE__*/ (function () {
    function SkipLastOperator(_skipCount) {
        this._skipCount = _skipCount;
        if (this._skipCount < 0) {
            throw new ArgumentOutOfRangeError;
        }
    }
    SkipLastOperator.prototype.call = function (subscriber, source) {
        if (this._skipCount === 0) {
            return source.subscribe(new Subscriber(subscriber));
        }
        else {
            return source.subscribe(new SkipLastSubscriber(subscriber, this._skipCount));
        }
    };
    return SkipLastOperator;
}());
var SkipLastSubscriber = /*@__PURE__*/ (function (_super) {
    tslib_1.__extends(SkipLastSubscriber, _super);
    function SkipLastSubscriber(destination, _skipCount) {
        var _this = _super.call(this, destination) || this;
        _this._skipCount = _skipCount;
        _this._count = 0;
        _this._ring = new Array(_skipCount);
        return _this;
    }
    SkipLastSubscriber.prototype._next = function (value) {
        var skipCount = this._skipCount;
        var count = this._count++;
        if (count < skipCount) {
            this._ring[count] = value;
        }
        else {
            var currentIndex = count % skipCount;
            var ring = this._ring;
            var oldValue = ring[currentIndex];
            ring[currentIndex] = value;
            this.destination.next(oldValue);
        }
    };
    return SkipLastSubscriber;
}(Subscriber));
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