golang学习之struct

type identifier struct {
    field1 type1
    field2 type2
    ...
}

var t *T
t = new(T)

type myStruct struct { i int }
var v myStruct    // v是结构体类型变量
var p *myStruct   // p是指向一个结构体类型变量的指针
v.i
p.i

package main

import (
    "fmt"
    "strings"
)

type Person struct {
    firstName string
    lastName  string
}

func upPerson(p *Person) {
    p.firstName = strings.ToUpper(p.firstName)
    p.lastName = strings.ToUpper(p.lastName)
}

func main() {

    // 1-struct as a value type:
    var pers1 Person
    pers1.firstName = "Chris"
    pers1.lastName = "Woodward"
    upPerson(&pers1)
    fmt.Printf("The name of the person is %s %s\n", pers1.firstName, pers1.lastName)

    // 2—struct as a pointer:
    pers2 := new(Person)
    pers2.firstName = "Chris"
    pers2.lastName = "Woodward"
    (*pers2).lastName = "Woodward" // 这是合法的
    upPerson(pers2)
    fmt.Printf("The name of the person is %s %s\n", pers2.firstName, pers2.lastName)

    // 3—struct as a literal:
    pers3 := &Person{"Chris", "Woodward"}
    upPerson(pers3)
    fmt.Printf("The name of the person is %s %s\n", pers3.firstName, pers3.lastName)
}

The name of the person is CHRIS WOODWARD
The name of the person is CHRIS WOODWARD
The name of the person is CHRIS WOODWARD

package main

import (
    "fmt"
    "reflect"
)

type Person struct {
    firstName string `An important answer`
    lastName  string `The name of the thing`
}

func main() {

    tt := Person{"first", "last"}
    for i := 0; i < 2; i++ {
        refTag(tt, i)
    }
}

Tag:An important answer    Name:firstName
Tag:The name of the thing    Name:lastName