Depending on your requirements, you may need to read both of the channels for every iteration (i.e. a sort-of 'zip' function). You can do this with a select, similarly to user860302's answer:
func main() {
c1 := make(chan int)
c2 := make(chan int)
out := make(chan int)
go func(in1, in2 <-chan int, out chan<- int) {
for {
sum := 0
select {
case sum = <-in1:
sum += <-in2
case sum = <-in2:
sum += <-in1
}
out <- sum
}
}(c1, c2, out)
}
This runs forever. My preferred way to terminate goroutines like this one is to close the input channels. In this case you would need to wait for both to close, then close(out)
before terminating.
Tip: note the use of directional channels as goroutine formal parameters. The compiler catches more mistakes when you write it this way. Happiness!