doc: add Defer, Panic, and Recover article
Originally published on The Go Programming Language Blog, August 4 2010.
http://blog.golang.org/2010/08/defer-panic-and-recover.html
Update #2547
R=golang-dev, r, r
CC=golang-dev
https://golang.org/cl/5479053
diff --git a/doc/progs/defer.go b/doc/progs/defer.go
new file mode 100644
index 0000000..f52278a
--- /dev/null
+++ b/doc/progs/defer.go
@@ -0,0 +1,53 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// This file contains the code snippets included in "Defer, Panic, an Recover."
+
+package main
+
+import (
+ "fmt"
+ "io"
+ "os"
+)
+
+func a() {
+ i := 0
+ defer fmt.Println(i)
+ i++
+ return
+}
+// STOP OMIT
+
+func b() {
+ for i := 0; i < 4; i++ {
+ defer fmt.Print(i)
+ }
+}
+// STOP OMIT
+
+func c() (i int) {
+ defer func() { i++ }()
+ return 1
+}
+// STOP OMIT
+
+// Intial version.
+func CopyFile(dstName, srcName string) (written int64, err error) {
+ src, err := os.Open(srcName)
+ if err != nil {
+ return
+ }
+
+ dst, err := os.Create(dstName)
+ if err != nil {
+ return
+ }
+
+ written, err = io.Copy(dst, src)
+ dst.Close()
+ src.Close()
+ return
+}
+// STOP OMIT
