71 lines
2.8 KiB
C
71 lines
2.8 KiB
C
/*
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Copyright (c) 2016, 2024, Oracle and/or its affiliates.
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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 designed to work 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 either included with
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the program or referenced in the documentation.
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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 MY_DOUBLE2ULONGLONG_INCLUDED
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#define MY_DOUBLE2ULONGLONG_INCLUDED
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/**
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@file include/my_double2ulonglong.h
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Utility functions for converting between ulonglong and double.
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*/
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#include "my_inttypes.h"
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#ifdef _WIN32
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inline unsigned long long my_double2ulonglong(double d) {
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const double t = d - (double)0x8000000000000000ULL;
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if (t >= 0) return ((unsigned long long)t) + 0x8000000000000000ULL;
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return (unsigned long long)d;
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}
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#define double2ulonglong my_double2ulonglong
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#endif /* _WIN32 */
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#ifndef ulonglong2double
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#define ulonglong2double(A) ((double)(ulonglong)(A))
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#define my_off_t2double(A) ((double)(my_off_t)(A))
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#endif
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#ifndef double2ulonglong
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#define double2ulonglong(A) ((ulonglong)(double)(A))
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#endif
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// The largest longlong that will fix into a double (LLONG_MAX is not
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// exactly convertible to double, so for large double x, the test
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// x <= LLONG_MAX does not guarantee x will fit in a longlong,
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// and may give a compiler warning). LLONG_MIN is exact.
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static constexpr double LLONG_MAX_DOUBLE = 9223372036854774784.0;
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// Similar, for ulonglong.
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static constexpr double ULLONG_MAX_DOUBLE = 18446744073709549568.0;
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// The largest and smallest integer that is guaranteed to fix exactly into a
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// double (there are 53 mantissa bits).
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static constexpr int64_t MAX_EXACT_INTEGER_DOUBLE = (1ULL << 53);
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static constexpr int64_t MIN_EXACT_INTEGER_DOUBLE = -MAX_EXACT_INTEGER_DOUBLE;
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// Same, for float.
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static constexpr int64_t MAX_EXACT_INTEGER_FLOAT = (1ULL << 23);
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static constexpr int64_t MIN_EXACT_INTEGER_FLOAT = -MAX_EXACT_INTEGER_FLOAT;
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#endif // MY_DOUBLE2ULONGLONG_INCLUDED
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