github.com/arieschain/arieschain@v0.0.0-20191023063405-37c074544356/rlp/decode_tail_test.go (about) 1 package rlp 2 3 import ( 4 "bytes" 5 "fmt" 6 ) 7 8 type structWithTail struct { 9 A, B uint 10 C []uint `rlp:"tail"` 11 } 12 13 func ExampleDecode_structTagTail() { 14 // In this example, the "tail" struct tag is used to decode lists of 15 // differing length into a struct. 16 var val structWithTail 17 18 err := Decode(bytes.NewReader([]byte{0xC4, 0x01, 0x02, 0x03, 0x04}), &val) 19 fmt.Printf("with 4 elements: err=%v val=%v\n", err, val) 20 21 err = Decode(bytes.NewReader([]byte{0xC6, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06}), &val) 22 fmt.Printf("with 6 elements: err=%v val=%v\n", err, val) 23 24 // Note that at least two list elements must be present to 25 // fill fields A and B: 26 err = Decode(bytes.NewReader([]byte{0xC1, 0x01}), &val) 27 fmt.Printf("with 1 element: err=%q\n", err) 28 29 // Output: 30 // with 4 elements: err=<nil> val={1 2 [3 4]} 31 // with 6 elements: err=<nil> val={1 2 [3 4 5 6]} 32 // with 1 element: err="rlp: too few elements for rlp.structWithTail" 33 }