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fix some typos, mostly
R=gri OCL=16161 CL=16161
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@ -348,7 +348,7 @@ we have a second implementation of the "Reader" interface.
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--PROG progs/cat_rot13.go /type.Rot13/ /end.of.Rot13/
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(The "rot13" function called on line 39 is trivial and not worth reproducing.)
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(The "rot13" function called on line 38 is trivial and not worth reproducing.)
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To use the new feature, we define a flag:
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@ -358,6 +358,8 @@ and use it from within a mostly unchanged "cat()" function:
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--PROG progs/cat_rot13.go /func.cat/ /^}/
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(We could also do the wrapping in "main" and leave "cat()" mostly alone, except
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for changing the type of the argument.)
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Lines 53 and 54 set it all up: If the "rot13" flag is true, wrap the "Reader"
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we received into a "Rot13" and proceed. Note that the interface variables
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are values, not pointers: the argument is of type "Reader", not "*Reader",
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@ -374,7 +376,7 @@ Here it is in action:
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</pre>
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Fans of dependency injection may take cheer from how easily interfaces
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made substituting the implementation of a file descriptor.
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allow us to substitute the implementation of a file descriptor.
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Interfaces are a distinct feature of Go. An interface is implemented by a
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type if the type implements all the methods declared in the interface.
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@ -526,7 +528,7 @@ With channels, it's possible to serve multiple independent client goroutines wit
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writing an actual multiplexer. The trick is to send the server a channel in the message,
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which it will then use to reply to the original sender.
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A realistic client-server program is a lot of code, so here is a very simple substitute
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to illustrate the idea. It starts by defining "Request" type, which embeds a channel
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to illustrate the idea. It starts by defining a "Request" type, which embeds a channel
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that will be used for the reply.
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--PROG progs/server.go /type.Request/ /^}/
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@ -13,7 +13,7 @@ func Generate(ch *chan int) {
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// Copy the values from channel 'in' to channel 'out',
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// removing those divisible by 'prime'.
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func Filter(in *chan int, out *chan int, prime int) {
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func Filter(in, out *chan int, prime int) {
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for {
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i := <-in // Receive value of new variable 'i' from 'in'.
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if i % prime != 0 {
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