Go-struct

1、struct说明

package main

import (
	"fmt"
	"time"
)

//struct定义不能包含自身
type Employee struct {
	ID            int    //大写的首字母，对外可见
	Name, Address string //相同类型可以放一行
	DoB           time.Time
	Position      string
	Salary        int
	ManagerID     int
	sex           string //小写的首字母，对外不可见
	//e             Employee  错误不能包含自身
	e *Employee //可以包含自身的指针
}

func main() {
	var dilbert Employee //初始化一个空的struct
	fmt.Printf("%+v\n", dilbert)
	dilbert.Salary -= 5000
	fmt.Printf("%+v\n", dilbert)
	position := &dilbert.Position
	*position = "Senior" + *position
	fmt.Printf("%+v\n", dilbert)
	dilbert.sex = "23" //包内可见
	fmt.Printf("%+v\n", dilbert)
}

2、使用struct实现二叉树

package main

import "fmt"

//二叉树定义
type tree struct {
	value       int
	left, right *tree
}

//堆排
func Sort(values []int) {
	var root *tree
	for _, v := range values {
		root = add(root, v)
	}
	appendValues(values[:0], root)
}
func appendValues(values []int, t *tree) []int {
	if t != nil {
		values = appendValues(values, t.left)
		values = append(values, t.value)
		values = appendValues(values, t.right)
	}
	return values
}

func add(t *tree, value int) *tree {
	if t == nil {
		t = new(tree)
		t.value = value
		return t
	}
	if value < t.value {
		t.left = add(t.left, value)
	} else {
		t.right = add(t.right, value)
	}
	return t
}
func main() {
	sli := []int{4, 7, 10, 8, 3, 0, -4, 30}
	Sort(sli)
	fmt.Println(sli)
}

3、使用struct模拟集合set

	seen := make(map[string]struct{}) // struct{}大小为0的结构体