github.com/aitimate-0/go-ethereum@v1.9.7/rlp/encoder_example_test.go (about)

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