You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: quantity_proto.go
    path of file: ./repos/kubernetes/staging/src/k8s.io/apimachinery/pkg/api/resource
    
    the code of the file until where you have to start completion: /*
Copyright 2015 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package resource

import (
	"fmt"
	"io"
	"math/bits"

	"github.com/gogo/protobuf/proto"
)

var _ proto.Sizer = &Quantity{}

func (m *Quantity) Marshal() (data []byte, err error) {
	size := m.Size()
	data = make([]byte, size)
	n, err := m.MarshalToSizedBuffer(data[:size])
	if err != nil {
		return nil, err
	}
	return data[:n], nil
}

// MarshalTo is a customized version of the generated Protobuf unmarshaler for a struct
// with a single string field.
func (m *Quantity) MarshalTo(data []byte) (int, error) {
	size := m.Size()
	return m.MarshalToSizedBuffe
    
func skipGenerated(data []byte) (n int, err error) {
	l := len(data)
	iNdEx := 0
	for iNdEx < l {
		var wire uint64
		for shift := uint(0); ; shift += 7 {
			if shift >= 64 {
				return 0, ErrIntOverflowGenerated
			}
			if iNdEx >= l {
				return 0, io.ErrUnexpectedEOF
			}
			b := data[iNdEx]
			iNdEx++
			wire |= (uint64(b) & 0x7F) << shift
			if b < 0x80 {
				break
			}
		}
		wireType := int(wire & 0x7)
		switch wireType {
		case 0:
			for shift := uint(0); ; shift += 7 {
				if shift >= 64 {
					return 0, ErrIntOverflowGenerated
				}
				if iNdEx >= l {
					return 0, io.ErrUnexpectedEOF
				}
				iNdEx++
				if data[iNdEx-1] < 0x80 {
					break
				}
			}
			return iNdEx, nil
		case 1:
			iNdEx += 8
			return iNdEx, nil
		case 2:
			var length int
			for shift := uint(0); ; shift += 7 {
				if shift >= 64 {
					return 0, ErrIntOverflowGenerated
				}
				if iNdEx >= l {
					return 0, io.ErrUnexpectedEOF
				}
				b := data[iNdEx]
				iNdEx++
				length |= (int(b) & 0x7F) << shift
				if b < 0x80 {
					break
				}
			}
			iNdEx += length
			if length < 0 {
				return 0, ErrInvalidLengthGenerated
			}
			return iNdEx, nil
		case 3:
			for {
				var innerWire uint64
				var start int = iNdEx
				for shift := uint(0); ; shift += 7 {
					if shift >= 64 {
						return 0, ErrIntOverflowGenerated
					}
					if iNdEx >= l {
						return 0, io.ErrUnexpectedEOF
					}
					b := data[iNdEx]
					iNdEx++
					innerWire |= (uint64(b) & 0x7F) << shift
					if b < 0x80 {
						break
					}
				}
				innerWireType := int(innerWire & 0x7)
				if innerWireType == 4 {
					break
				}
				next, err := skipGenerated(data[start:])
				if err != nil {
					return 0, err
				}
				iNdEx = start + next
			}
			return iNdEx, nil
		case 4:
			return iNdEx, nil
		case 5:
			iNdEx += 4
			return iNdEx, nil
		default:
			return 0, fmt.Errorf("proto: illegal wireType %d", wireType)
		}
	}
	panic("unreachable")
}