github.com/klaytn/klaytn@v1.12.1/rlp/encoder_example_test.go (about)

     1  // Modifications Copyright 2022 The klaytn Authors
     2  // Copyright 2014 The go-ethereum Authors
     3  // This file is part of the go-ethereum library.
     4  //
     5  // The go-ethereum library is free software: you can redistribute it and/or modify
     6  // it under the terms of the GNU Lesser General Public License as published by
     7  // the Free Software Foundation, either version 3 of the License, or
     8  // (at your option) any later version.
     9  //
    10  // The go-ethereum library is distributed in the hope that it will be useful,
    11  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    13  // GNU Lesser General Public License for more details.
    14  //
    15  // You should have received a copy of the GNU Lesser General Public License
    16  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    17  //
    18  // This file is derived from rlp/encoder_example_test.go(2022/05/19)
    19  // Modified and improved for the klaytn development.
    20  
    21  package rlp_test
    22  
    23  import (
    24  	"fmt"
    25  	"io"
    26  
    27  	"github.com/klaytn/klaytn/rlp"
    28  )
    29  
    30  type MyCoolType struct {
    31  	Name string
    32  	a, b uint
    33  }
    34  
    35  // EncodeRLP writes x as RLP list [a, b] that omits the Name field.
    36  func (x *MyCoolType) EncodeRLP(w io.Writer) (err error) {
    37  	return rlp.Encode(w, []uint{x.a, x.b})
    38  }
    39  
    40  func ExampleEncoder() {
    41  	var t *MyCoolType // t is nil pointer to MyCoolType
    42  	bytes, _ := rlp.EncodeToBytes(t)
    43  	fmt.Printf("%v → %X\n", t, bytes)
    44  
    45  	t = &MyCoolType{Name: "foobar", a: 5, b: 6}
    46  	bytes, _ = rlp.EncodeToBytes(t)
    47  	fmt.Printf("%v → %X\n", t, bytes)
    48  
    49  	// Output:
    50  	// <nil> → C0
    51  	// &{foobar 5 6} → C20506
    52  }