80 lines
2.7 KiB
JavaScript
80 lines
2.7 KiB
JavaScript
/*
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* Copyright (C) 2017 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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"use strict";
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let eBufferCount = 0;
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let canAllocateEBuffers = true;
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class EBuffer {
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constructor(size)
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{
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if (!canAllocateEBuffers)
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throw new Error("Trying to allocate EBuffer while allocation is disallowed");
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this._index = eBufferCount++;
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this._array = new Array(size);
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}
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static setCanAllocateEBuffers(value, callback)
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{
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let oldCanAllocateEBuffers = canAllocateEBuffers;
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canAllocateEBuffers = value;
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try {
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return callback();
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} finally {
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canAllocateEBuffers = oldCanAllocateEBuffers;
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}
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}
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static disallowAllocation(callback)
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{
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return EBuffer.setCanAllocateEBuffers(false, callback);
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}
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static allowAllocation(callback)
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{
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return EBuffer.setCanAllocateEBuffers(true, callback);
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}
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get(index)
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{
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if (index < 0 || index >= this._array.length)
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throw new Error("Out of bounds buffer access (buffer = " + this + ", index = " + index + ")");
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return this._array[index];
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}
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set(index, value)
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{
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if (index < 0 || index >= this._array.length)
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throw new Error("out of bounds buffer access (buffer = " + this + ", index = " + index + ")");
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this._array[index] = value;
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}
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get index() { return this._index; }
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toString()
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{
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return "B" + this._index + ":[" + this._array + "]";
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}
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}
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