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package main | |
import ( | |
"fmt" | |
"strings" | |
) | |
type foo int | |
const ( | |
One foo = iota | |
Two | |
Three | |
Four | |
) | |
var fooNames = [...]string{ | |
One: "One", | |
Two: "Two", | |
Three: "Three", | |
Four: "Four", | |
} | |
func (f foo) String() string { | |
return fooNames[f] | |
} | |
type mask int | |
const ( | |
Read mask = 1 << iota | |
Write | |
Async | |
) | |
var maskNames = [...]string{ | |
Read: "Read", | |
Write: "Write", | |
Async: "Async", | |
} | |
func (m mask) String() string { | |
var masks []string | |
for i := Read; i <= Async; i <<= 1 { | |
if m & i != 0 { | |
masks = append(masks, maskNames[i]) | |
} | |
} | |
return strings.Join(masks, " | ") | |
} | |
func main() { | |
for _, val := range []foo{One,Two,Three,Four} { | |
fmt.Printf("(%T) %v %v\n", val, int(val), val) | |
} | |
for _, val := range []mask{ | |
Read, | |
Write, | |
Async, | |
Read | Async, | |
Write | Async, | |
Read | Write, | |
Read | Write | Async, | |
} { | |
fmt.Printf("(%T) %v %v\n", val, int(val), val) | |
} | |
} |
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(main.foo) 0 One | |
(main.foo) 1 Two | |
(main.foo) 2 Three | |
(main.foo) 3 Four | |
(main.mask) 1 Read | |
(main.mask) 2 Write | |
(main.mask) 4 Async | |
(main.mask) 5 Read | Async | |
(main.mask) 6 Write | Async | |
(main.mask) 3 Read | Write | |
(main.mask) 7 Read | Write | Async |
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