50 lines
1.7 KiB
Go
50 lines
1.7 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package rlp
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import (
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"bytes"
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"fmt"
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)
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type structWithTail struct {
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A, B uint
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C []uint `rlp:"tail"`
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}
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func ExampleDecode_structTagTail() {
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// In this example, the "tail" struct tag is used to decode lists of
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// differing length into a struct.
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var val structWithTail
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err := Decode(bytes.NewReader([]byte{0xC4, 0x01, 0x02, 0x03, 0x04}), &val)
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fmt.Printf("with 4 elements: err=%v val=%v\n", err, val)
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err = Decode(bytes.NewReader([]byte{0xC6, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06}), &val)
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fmt.Printf("with 6 elements: err=%v val=%v\n", err, val)
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// Note that at least two list elements must be present to
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// fill fields A and B:
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err = Decode(bytes.NewReader([]byte{0xC1, 0x01}), &val)
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fmt.Printf("with 1 element: err=%q\n", err)
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// Output:
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// with 4 elements: err=<nil> val={1 2 [3 4]}
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// with 6 elements: err=<nil> val={1 2 [3 4 5 6]}
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// with 1 element: err="rlp: too few elements for rlp.structWithTail"
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}
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