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November 1, 2022 15:53
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package main | |
import ( | |
"context" | |
"fmt" | |
) | |
func gen(ctx context.Context) <-chan int { | |
ch := make(chan int) | |
go func() { | |
var n int | |
for { | |
select { | |
case <-ctx.Done(): | |
return | |
case ch <- n: | |
n++ | |
} | |
} | |
}() | |
return ch | |
} | |
func main() { | |
ctx, cancel := context.WithCancel(context.Background()) | |
defer cancel() | |
for n := range gen(ctx) { | |
fmt.Println(n) | |
if n == 5 { | |
cancel() | |
break | |
} | |
} | |
} |
@gerep It is duplicated I believe.
check the example
of WithCancel
doc: https://golang.org/pkg/context/#WithCancel
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Is it required to call
cancel()
inside then == 5
conditional even when you are usingbreak
to escape the loop and usingdefer cancel()
?