MySQL 8.4.3
Source Code Documentation
val_int_compare.h
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23
24#ifndef VAL_INT_COMPARE_INCLUDED
25#define VAL_INT_COMPARE_INCLUDED
26
27#include <assert.h>
28#include <functional>
29
30#include "my_inttypes.h"
31
32/**
33 Holds value/unsigned_flag for the result of val_int(),
34 so that we can compare with operator<(), operator==() and operator<=()
35 */
37 public:
38 constexpr Integer_value(longlong val, bool unsigned_flag)
39 : m_val(val), m_unsigned_flag(unsigned_flag) {}
40
41 constexpr longlong val() const { return m_val; }
42 constexpr bool is_unsigned() const { return m_unsigned_flag; }
43
45 assert(!is_negative());
46 return static_cast<ulonglong>(m_val);
47 }
48
49 constexpr bool is_negative() const { return !is_unsigned() && val() < 0; }
50
51 private:
53 const bool m_unsigned_flag;
54};
55
56inline bool operator<(const Integer_value &lhs, const Integer_value &rhs) {
57 const bool lhs_is_neg = lhs.is_negative();
58 const bool rhs_is_neg = rhs.is_negative();
59 if (lhs_is_neg != rhs_is_neg)
60 // Different signs, lhs is smaller if it is negative.
61 return lhs_is_neg;
62 if (lhs_is_neg)
63 // Both are negative, compare as signed.
64 return lhs.val() < rhs.val();
65
66 // Both are non-negative, compare as unsigned
67 return std::less<ulonglong>()(lhs.val(), rhs.val());
68}
69
70inline bool operator==(const Integer_value &lhs, const Integer_value &rhs) {
71 const bool lhs_is_neg = lhs.is_negative();
72 const bool rhs_is_neg = rhs.is_negative();
73 if (lhs_is_neg != rhs_is_neg)
74 // Different signs, cannot be equal
75 return false;
76
77 // Same sign, compare values.
78 return lhs.val() == rhs.val();
79}
80
81inline bool operator<=(const Integer_value &lhs, const Integer_value &rhs) {
82 return lhs < rhs || lhs == rhs;
83}
84
85#endif // VAL_INT_COMPARE_INCLUDED
Holds value/unsigned_flag for the result of val_int(), so that we can compare with operator<(),...
Definition: val_int_compare.h:36
const bool m_unsigned_flag
Definition: val_int_compare.h:53
constexpr longlong val() const
Definition: val_int_compare.h:41
constexpr bool is_negative() const
Definition: val_int_compare.h:49
ulonglong val_unsigned() const
Definition: val_int_compare.h:44
constexpr Integer_value(longlong val, bool unsigned_flag)
Definition: val_int_compare.h:38
constexpr bool is_unsigned() const
Definition: val_int_compare.h:42
const longlong m_val
Definition: val_int_compare.h:52
Some integer typedefs for easier portability.
unsigned long long int ulonglong
Definition: my_inttypes.h:56
long long int longlong
Definition: my_inttypes.h:55
bool operator<=(const Integer_value &lhs, const Integer_value &rhs)
Definition: val_int_compare.h:81
bool operator==(const Integer_value &lhs, const Integer_value &rhs)
Definition: val_int_compare.h:70
bool operator<(const Integer_value &lhs, const Integer_value &rhs)
Definition: val_int_compare.h:56