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authorFelix Lange <fjl@twurst.com>2015-12-22 04:05:20 +0800
committerFelix Lange <fjl@twurst.com>2016-02-19 18:14:29 +0800
commitbb07ce3eedabb2133227ba1d7569d171d8e5b25c (patch)
tree9e5b8ff9506f39ca1b94a21833b96646ccb7a19b /rlp/decode_tail_test.go
parentfdb936ee95d09b1b98418735a813deba6770ad5a (diff)
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rlp: add "tail" struct tag
Diffstat (limited to 'rlp/decode_tail_test.go')
-rw-r--r--rlp/decode_tail_test.go33
1 files changed, 33 insertions, 0 deletions
diff --git a/rlp/decode_tail_test.go b/rlp/decode_tail_test.go
new file mode 100644
index 000000000..885354390
--- /dev/null
+++ b/rlp/decode_tail_test.go
@@ -0,0 +1,33 @@
+package rlp
+
+import (
+ "bytes"
+ "fmt"
+)
+
+type structWithTail struct {
+ A, B uint
+ C []uint `rlp:"tail"`
+}
+
+func ExampleDecode_structTagTail() {
+ // In this example, the "tail" struct tag is used to decode lists of
+ // differing length into a struct.
+ var val structWithTail
+
+ err := Decode(bytes.NewReader([]byte{0xC4, 0x01, 0x02, 0x03, 0x04}), &val)
+ fmt.Printf("with 4 elements: err=%v val=%v\n", err, val)
+
+ err = Decode(bytes.NewReader([]byte{0xC6, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06}), &val)
+ fmt.Printf("with 6 elements: err=%v val=%v\n", err, val)
+
+ // Note that at least two list elements must be present to
+ // fill fields A and B:
+ err = Decode(bytes.NewReader([]byte{0xC1, 0x01}), &val)
+ fmt.Printf("with 1 element: err=%q\n", err)
+
+ // Output:
+ // with 4 elements: err=<nil> val={1 2 [3 4]}
+ // with 6 elements: err=<nil> val={1 2 [3 4 5 6]}
+ // with 1 element: err="rlp: too few elements for rlp.structWithTail"
+}