mirror of https://github.com/axmolengine/axmol.git
59 lines
1.5 KiB
C++
59 lines
1.5 KiB
C++
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=4 sw=4 et tw=99 ft=cpp:
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef BitArray_h__
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#define BitArray_h__
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#include "jstypes.h"
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#include "js/TemplateLib.h"
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namespace js {
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template <size_t nbits>
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class BitArray {
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private:
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uintptr_t map[nbits / JS_BITS_PER_WORD + (nbits % JS_BITS_PER_WORD == 0 ? 0 : 1)];
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public:
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void clear(bool value) {
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if (value)
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memset(map, 0xFF, sizeof(map));
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else
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memset(map, 0, sizeof(map));
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}
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inline bool get(size_t offset) const {
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uintptr_t index, mask;
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getMarkWordAndMask(offset, &index, &mask);
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return map[index] & mask;
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}
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inline void set(size_t offset) {
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uintptr_t index, mask;
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getMarkWordAndMask(offset, &index, &mask);
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map[index] |= mask;
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}
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inline void unset(size_t offset) {
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uintptr_t index, mask;
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getMarkWordAndMask(offset, &index, &mask);
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map[index] &= ~mask;
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}
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private:
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inline void getMarkWordAndMask(size_t offset,
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uintptr_t *indexp, uintptr_t *maskp) const {
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*indexp = offset >> tl::FloorLog2<JS_BITS_PER_WORD>::result;
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*maskp = uintptr_t(1) << (offset & (JS_BITS_PER_WORD - 1));
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}
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};
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} /* namespace js */
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#endif
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