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https://github.com/golang/go
synced 2024-11-11 22:40:22 -07:00
- fixed sieve.go example (channel directions were wrong)
- cosmetic adjustments R=r DELTA=30 (0 added, 0 deleted, 30 changed) OCL=35010 CL=35012
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@ -416,7 +416,7 @@ the (possibly multi-byte) UTF-8 encoding of individual <i>characters</i>.
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Thus inside a string literal <code>\377</code> and <code>\xFF</code> represent
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a single byte of value <code>0xFF</code>=255, while <code>ÿ</code>,
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<code>\u00FF</code>, <code>\U000000FF</code> and <code>\xc3\xbf</code> represent
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the two bytes <code>0xc3 0xbf</code> of the UTF-8 encoding of character
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the two bytes <code>0xc3</code> <code>0xbf</code> of the UTF-8 encoding of character
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U+00FF.
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</p>
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@ -1095,8 +1095,8 @@ to receive. This constraint is called a channel's <i>direction</i>; either
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</p>
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<pre>
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chan T // can be used to send and receive values of type T
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chan <- float // can only be used to send floats
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chan T // can be used to send and receive values of type T
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chan<- float // can only be used to send floats
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<-chan int // can only be used to receive ints
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</pre>
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@ -2796,7 +2796,7 @@ a channel and a value (expression):
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</p>
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<pre>
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ch <- 3
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ch <- 3
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</pre>
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<p>
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@ -2817,10 +2817,10 @@ These two examples are equivalent:
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</p>
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<pre>
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ok := ch <- 3;
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ok := ch <- 3;
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if ok { print("sent") } else { print("not sent") }
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if ch <- 3 { print("sent") } else { print("not sent") }
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if ch <- 3 { print("sent") } else { print("not sent") }
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</pre>
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<p>
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@ -2836,7 +2836,7 @@ is the element type of the channel.
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</p>
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<pre>
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<-ch
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<-ch
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</pre>
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<p>
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@ -2847,10 +2847,10 @@ discarded.
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</p>
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<pre>
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v1 := <-ch
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v2 = <-ch
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f(<-ch)
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<-strobe // wait until clock pulse
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v1 := <-ch
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v2 = <-ch
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f(<-ch)
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<-strobe // wait until clock pulse
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</pre>
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<p>
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@ -2858,9 +2858,9 @@ If a receive expression is used in an assignment or initialization of the form
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</p>
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<pre>
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x, ok = <-ch
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x, ok := <-ch
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var x, ok = <-ch
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x, ok = <-ch
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x, ok := <-ch
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var x, ok = <-ch
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</pre>
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<p>
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@ -3079,12 +3079,12 @@ order. Otherwise, the order of evaluation is unspecified.
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For example, in the assignment
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</p>
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<pre>
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y[f()], ok = g(h(), i() + x[j()], <-c), k()
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y[f()], ok = g(h(), i() + x[j()], <-c), k()
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</pre>
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<p>
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the function calls and communication happen in the order
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<code>f()</code>, <code>h()</code>, <code>i()</code>, <code>j()</code>,
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<code><-c</code>, <code>g()</code>, and <code>k()</code>.
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<code><-c</code>, <code>g()</code>, and <code>k()</code>.
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However, the order of those events compared to the evaluation
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and indexing of <code>x</code> and the evaluation
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of <code>y</code> is not specified.
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@ -3166,7 +3166,7 @@ ExpressionStmt = Expression .
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<pre>
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f(x+y)
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<-ch
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<-ch
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</pre>
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@ -3212,7 +3212,7 @@ or the <a href="#Blank_identifier">blank identifier</a>.
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x = 1
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*p = f()
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a[i] = 23
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k = <-ch
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k = <-ch
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</pre>
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<p>
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@ -3648,7 +3648,7 @@ for the invoked function to complete.
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<pre>
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go Server()
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go func(ch chan <- bool) { for { sleep(10); ch <- true; }} (c)
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go func(ch chan<- bool) { for { sleep(10); ch <- true; }} (c)
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</pre>
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@ -4252,37 +4252,37 @@ package main
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import "fmt"
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// Send the sequence 2, 3, 4, ... to channel 'ch'.
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func generate(ch chan <- int) {
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func generate(ch chan<- int) {
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for i := 2; ; i++ {
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ch <- i // Send 'i' to channel 'ch'.
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ch <- i; // Send 'i' to channel 'ch'.
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}
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}
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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(src chan <- int, dst <-chan int, prime int) {
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for i := range src { // Loop over values received from 'src'.
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if i % prime != 0 {
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dst <- i // Send 'i' to channel 'dst'.
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func filter(src <-chan int, dst chan<- int, prime int) {
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for i := range src { // Loop over values received from 'src'.
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if i%prime != 0 {
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dst <- i; // Send 'i' to channel 'dst'.
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}
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}
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}
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// The prime sieve: Daisy-chain filter processes together.
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func sieve() {
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ch := make(chan int); // Create a new channel.
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go generate(ch); // Start generate() as a subprocess.
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ch := make(chan int); // Create a new channel.
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go generate(ch); // Start generate() as a subprocess.
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for {
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prime := <-ch;
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prime := <-ch;
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fmt.Print(prime, "\n");
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ch1 := make(chan int);
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go filter(ch, ch1, prime);
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ch = ch1
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ch = ch1;
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}
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}
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func main() {
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sieve()
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sieve();
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}
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</pre>
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