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Current Path : /usr/include/mysql/server/private/ |
Current File : //usr/include/mysql/server/private/sql_type_int.h |
/* Copyright (c) 2006, 2010, Oracle and/or its affiliates. Copyright (c) 2011, 2016, MariaDB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */ #ifndef SQL_TYPE_INT_INCLUDED #define SQL_TYPE_INT_INCLUDED // A longlong/ulonglong hybrid. Good to store results of val_int(). class Longlong_hybrid { protected: longlong m_value; bool m_unsigned; int cmp_signed(const Longlong_hybrid& other) const { return m_value < other.m_value ? -1 : m_value == other.m_value ? 0 : 1; } int cmp_unsigned(const Longlong_hybrid& other) const { return (ulonglong) m_value < (ulonglong) other.m_value ? -1 : m_value == other.m_value ? 0 : 1; } public: Longlong_hybrid(longlong nr, bool unsigned_flag) :m_value(nr), m_unsigned(unsigned_flag) { } longlong value() const { return m_value; } bool is_unsigned() const { return m_unsigned; } bool is_unsigned_outside_of_signed_range() const { return m_unsigned && ((ulonglong) m_value) > (ulonglong) LONGLONG_MAX; } bool neg() const { return m_value < 0 && !m_unsigned; } ulonglong abs() const { if (m_unsigned) return (ulonglong) m_value; if (m_value == LONGLONG_MIN) // avoid undefined behavior return ((ulonglong) LONGLONG_MAX) + 1; return m_value < 0 ? -m_value : m_value; } /* Convert to an unsigned number: - Negative numbers are converted to 0. - Positive numbers bigger than upper_bound are converted to upper_bound. - Other numbers are returned as is. */ ulonglong to_ulonglong(ulonglong upper_bound) const { return neg() ? 0 : (ulonglong) m_value > upper_bound ? upper_bound : (ulonglong) m_value; } uint to_uint(uint upper_bound) const { return (uint) to_ulonglong(upper_bound); } int cmp(const Longlong_hybrid& other) const { if (m_unsigned == other.m_unsigned) return m_unsigned ? cmp_unsigned(other) : cmp_signed(other); if (is_unsigned_outside_of_signed_range()) return 1; if (other.is_unsigned_outside_of_signed_range()) return -1; /* The unsigned argument is in the range 0..LONGLONG_MAX. The signed argument is in the range LONGLONG_MIN..LONGLONG_MAX. Safe to compare as signed. */ return cmp_signed(other); } bool operator==(const Longlong_hybrid &nr) const { return cmp(nr) == 0; } bool operator==(ulonglong nr) const { return cmp(Longlong_hybrid((longlong) nr, true)) == 0; } bool operator==(uint nr) const { return cmp(Longlong_hybrid((longlong) nr, true)) == 0; } bool operator==(longlong nr) const { return cmp(Longlong_hybrid(nr, false)) == 0; } bool operator==(int nr) const { return cmp(Longlong_hybrid(nr, false)) == 0; } }; #endif // SQL_TYPE_INT_INCLUDED