structhash

type Person struct {
	Name   string
	Age    int
	Emails []string
	Extra  map[string]string
	Spouse *Person
}
bill := &Person{
	Name:   "Bill",
	Age:    24,
	Emails: []string{"bob@foo.org", "bob@bar.org"},
	Extra: map[string]string{
		"facebook": "Bob42",
	},
}
bob := &Person{
	Name:   "Bob",
	Age:    42,
	Emails: []string{"bob@foo.org", "bob@bar.org"},
	Extra: map[string]string{
		"facebook": "Bob42",
	},
	Spouse: bill,
}

hash, err := Hash(bob, 1)
if err != nil {
	panic(err)
}
fmt.Printf("%s", hash)

Output:

v1_55743877f3ffd5fc834e97bc43a6e7bd

type Person struct {
	Name   string            `version:"1"`
	Age    int               `version:"1"`
	Emails []string          `version:"1"`
	Extra  map[string]string `version:"1" lastversion:"2"`
	Spouse *Person           `version:"2"`
}
bill := &Person{
	Name:   "Bill",
	Age:    24,
	Emails: []string{"bob@foo.org", "bob@bar.org"},
	Extra: map[string]string{
		"facebook": "Bob42",
	},
}
bob := &Person{
	Name:   "Bob",
	Age:    42,
	Emails: []string{"bob@foo.org", "bob@bar.org"},
	Extra: map[string]string{
		"facebook": "Bob42",
	},
	Spouse: bill,
}
hashV1, err := Hash(bob, 1)
if err != nil {
	panic(err)
}
hashV2, err := Hash(bob, 2)
if err != nil {
	panic(err)
}
hashV3, err := Hash(bob, 3)
if err != nil {
	panic(err)
}
fmt.Printf("%s\n", hashV1)
fmt.Printf("%s\n", hashV2)
fmt.Printf("%s\n", hashV3)

Output:

v1_461558d2570e10f79693e34ea309d1ad
v2_d00068b9441e09d87689c7cb06a646a1
v3_b5b651c6650939ef4d063d05caa5c778

// A hash string gotten from Hash(). Returns the version as an int.
i := Version("v1_55743877f3ffd5fc834e97bc43a6e7bd")
fmt.Printf("%d", i)

Output:

1

// A hash string gotten from Hash(). Returns -1 on error.
i := Version("va_55743877f3ffd5fc834e97bc43a6e7bd")
fmt.Printf("%d", i)

Output:

-1