MySQL 8.4.3
Source Code Documentation
my_double2ulonglong.h
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24
25#ifndef MY_DOUBLE2ULONGLONG_INCLUDED
26#define MY_DOUBLE2ULONGLONG_INCLUDED
27
28/**
29 @file include/my_double2ulonglong.h
30 Utility functions for converting between ulonglong and double.
31*/
32
33#include "my_inttypes.h"
34
35#ifdef _WIN32
36inline unsigned long long my_double2ulonglong(double d) {
37 const double t = d - (double)0x8000000000000000ULL;
38
39 if (t >= 0) return ((unsigned long long)t) + 0x8000000000000000ULL;
40 return (unsigned long long)d;
41}
42#define double2ulonglong my_double2ulonglong
43#endif /* _WIN32 */
44
45#ifndef ulonglong2double
46#define ulonglong2double(A) ((double)(ulonglong)(A))
47#define my_off_t2double(A) ((double)(my_off_t)(A))
48#endif
49#ifndef double2ulonglong
50#define double2ulonglong(A) ((ulonglong)(double)(A))
51#endif
52
53// The largest longlong that will fix into a double (LLONG_MAX is not
54// exactly convertible to double, so for large double x, the test
55// x <= LLONG_MAX does not guarantee x will fit in a longlong,
56// and may give a compiler warning). LLONG_MIN is exact.
57static constexpr double LLONG_MAX_DOUBLE = 9223372036854774784.0;
58
59// Similar, for ulonglong.
60static constexpr double ULLONG_MAX_DOUBLE = 18446744073709549568.0;
61
62// The largest and smallest integer that is guaranteed to fix exactly into a
63// double (there are 53 mantissa bits).
64static constexpr int64_t MAX_EXACT_INTEGER_DOUBLE = (1ULL << 53);
66
67// Same, for float.
68static constexpr int64_t MAX_EXACT_INTEGER_FLOAT = (1ULL << 23);
70
71#endif // MY_DOUBLE2ULONGLONG_INCLUDED
static constexpr int64_t MIN_EXACT_INTEGER_FLOAT
Definition: my_double2ulonglong.h:69
static constexpr double LLONG_MAX_DOUBLE
Definition: my_double2ulonglong.h:57
static constexpr double ULLONG_MAX_DOUBLE
Definition: my_double2ulonglong.h:60
static constexpr int64_t MAX_EXACT_INTEGER_DOUBLE
Definition: my_double2ulonglong.h:64
static constexpr int64_t MAX_EXACT_INTEGER_FLOAT
Definition: my_double2ulonglong.h:68
static constexpr int64_t MIN_EXACT_INTEGER_DOUBLE
Definition: my_double2ulonglong.h:65
Some integer typedefs for easier portability.