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85 lines
2.9 KiB
85 lines
2.9 KiB
5 months ago
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/* Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program 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 General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#ifndef VAL_INT_COMPARE_INCLUDED
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#define VAL_INT_COMPARE_INCLUDED
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#include <functional>
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#include "my_dbug.h"
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#include "my_inttypes.h"
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/**
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Holds value/unsigned_flag for the result of val_int(),
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so that we can compare with operator<(), operator==() and operator<=()
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*/
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class Integer_value {
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public:
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constexpr Integer_value(longlong val, bool unsigned_flag)
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: m_val(val), m_unsigned_flag(unsigned_flag) {}
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constexpr longlong val() const { return m_val; }
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constexpr bool is_unsigned() const { return m_unsigned_flag; }
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ulonglong val_unsigned() const {
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DBUG_ASSERT(!is_negative());
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return static_cast<ulonglong>(m_val);
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}
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constexpr bool is_negative() const { return !is_unsigned() && val() < 0; }
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private:
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const longlong m_val;
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const bool m_unsigned_flag;
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};
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inline bool operator<(const Integer_value &lhs, const Integer_value &rhs) {
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const bool lhs_is_neg = lhs.is_negative();
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const bool rhs_is_neg = rhs.is_negative();
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if (lhs_is_neg != rhs_is_neg)
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// Different signs, lhs is smaller if it is negative.
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return lhs_is_neg;
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if (lhs_is_neg)
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// Both are negative, compare as signed.
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return lhs.val() < rhs.val();
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// Both are non-negative, compare as unsigned
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return std::less<ulonglong>()(lhs.val(), rhs.val());
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}
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inline bool operator==(const Integer_value &lhs, const Integer_value &rhs) {
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const bool lhs_is_neg = lhs.is_negative();
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const bool rhs_is_neg = rhs.is_negative();
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if (lhs_is_neg != rhs_is_neg)
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// Different signs, cannot be equal
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return false;
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// Same sign, compare values.
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return lhs.val() == rhs.val();
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}
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inline bool operator<=(const Integer_value &lhs, const Integer_value &rhs) {
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return lhs < rhs || lhs == rhs;
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}
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#endif // VAL_INT_COMPARE_INCLUDED
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