blob: ac00bfa979bc3362179bb25451741d8ffdd880a5 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
|
package bitutil
import (
"strings"
"unsafe"
)
{{ range $idx, $size := . }}
// Flags{{ $size.Size }} is a type-casted unsigned integer with helper
// methods for easily managing up to {{ $size.Size }} bit-flags.
type Flags{{ $size.Size }} uint{{ $size.Size }}
// Get will fetch the flag bit value at index 'bit'.
func (f Flags{{ $size.Size }}) Get(bit uint8) bool {
mask := Flags{{ $size.Size }}(1) << bit
return (f & mask != 0)
}
// Set will set the flag bit value at index 'bit'.
func (f Flags{{ $size.Size }}) Set(bit uint8) Flags{{ $size.Size }} {
mask := Flags{{ $size.Size }}(1) << bit
return f | mask
}
// Unset will unset the flag bit value at index 'bit'.
func (f Flags{{ $size.Size }}) Unset(bit uint8) Flags{{ $size.Size }} {
mask := Flags{{ $size.Size }}(1) << bit
return f & ^mask
}
{{ range $idx := $size.Bits }}
// Get{{ $idx }} will fetch the flag bit value at index {{ $idx }}.
func (f Flags{{ $size.Size }}) Get{{ $idx }}() bool {
const mask = Flags{{ $size.Size }}(1) << {{ $idx }}
return (f & mask != 0)
}
// Set{{ $idx }} will set the flag bit value at index {{ $idx }}.
func (f Flags{{ $size.Size }}) Set{{ $idx }}() Flags{{ $size.Size }} {
const mask = Flags{{ $size.Size }}(1) << {{ $idx }}
return f | mask
}
// Unset{{ $idx }} will unset the flag bit value at index {{ $idx }}.
func (f Flags{{ $size.Size }}) Unset{{ $idx }}() Flags{{ $size.Size }} {
const mask = Flags{{ $size.Size }}(1) << {{ $idx }}
return f & ^mask
}
{{ end }}
// String returns a human readable representation of Flags{{ $size.Size }}.
func (f Flags{{ $size.Size }}) String() string {
var (
i int
val bool
buf []byte
)
// Make a prealloc est. based on longest-possible value
const prealloc = 1+(len("false ")*{{ $size.Size }})-1+1
buf = make([]byte, prealloc)
buf[i] = '{'
i++
{{ range $idx := .Bits }}
val = f.Get{{ $idx }}()
i += copy(buf[i:], bool2str(val))
buf[i] = ' '
i++
{{ end }}
buf[i-1] = '}'
buf = buf[:i]
return *(*string)(unsafe.Pointer(&buf))
}
// GoString returns a more verbose human readable representation of Flags{{ $size.Size }}.
func (f Flags{{ $size.Size }})GoString() string {
var (
i int
val bool
buf []byte
)
// Make a prealloc est. based on longest-possible value
const prealloc = len("bitutil.Flags{{ $size.Size }}{")+(len("{{ sub $size.Size 1 }}=false ")*{{ $size.Size }})-1+1
buf = make([]byte, prealloc)
i += copy(buf[i:], "bitutil.Flags{{ $size.Size }}{")
{{ range $idx := .Bits }}
val = f.Get{{ $idx }}()
i += copy(buf[i:], "{{ $idx }}=")
i += copy(buf[i:], bool2str(val))
buf[i] = ' '
i++
{{ end }}
buf[i-1] = '}'
buf = buf[:i]
return *(*string)(unsafe.Pointer(&buf))
}
{{ end }}
func bool2str(b bool) string {
if b {
return "true"
}
return "false"
}
|
