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85 lines
2.3 KiB
C++
85 lines
2.3 KiB
C++
/*
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This file is part of TON Blockchain Library.
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TON Blockchain Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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TON Blockchain Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2017-2019 Telegram Systems LLP
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*/
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#pragma once
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#include "td/utils/bits.h"
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#include "td/utils/int_types.h"
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#include "td/utils/StringBuilder.h"
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namespace td {
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class StringBuilder;
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}
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namespace vm {
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namespace detail {
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class LevelMask {
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public:
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explicit LevelMask(td::uint32 new_mask = 0) : mask_(new_mask) {
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}
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td::uint32 get_mask() const {
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return mask_;
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}
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td::uint32 get_level() const {
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return 32 - td::count_leading_zeroes32(mask_);
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}
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td::uint32 get_hash_i() const {
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return td::count_bits32(mask_);
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}
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td::uint32 get_hashes_count() const {
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return get_hash_i() + 1;
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}
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LevelMask apply(td::uint32 level) const {
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DCHECK(level < 32);
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return LevelMask{mask_ & ((1u << level) - 1)};
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}
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LevelMask apply_or(LevelMask other) const {
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return LevelMask{mask_ | other.mask_};
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}
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LevelMask shift_right() const {
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return LevelMask{mask_ >> 1};
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}
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bool is_significant(td::uint32 level) const {
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DCHECK(level < 32);
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bool res = level == 0 || ((mask_ >> (level - 1)) % 2 != 0);
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CHECK(res == (apply(level).get_level() == level));
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return res;
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}
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bool operator==(const LevelMask& other) const {
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return mask_ == other.mask_;
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}
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bool operator!=(const LevelMask& other) const {
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return !(*this == other);
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}
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static LevelMask one_level(td::uint32 level) {
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DCHECK(level < 32);
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if (level == 0) {
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return LevelMask(0);
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}
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return LevelMask(1 << (level - 1));
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}
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private:
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td::uint32 mask_;
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};
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td::StringBuilder& operator<<(td::StringBuilder& sb, LevelMask level_mask);
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} // namespace detail
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} // namespace vm
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