详解Golang中哪些类型可以作为map的key

package main
 
import "fmt"
 
func main() {
	// 整数作为键
	mapInt := map[int]string{
		1: "one",
		2: "two",
		3: "three",
	}
  
	// 字符串作为键
	mapString := map[string]int{
		"Alice": 25,
		"Bob":   30,
		"Eve":   22,
	}
  
	// 浮点数作为键（不推荐，因为浮点数的比较可能会因精度问题导致不准确）
	mapFloat64 := map[float64]string{
		1.1: "one point one",
		2.2: "two point two",
		3.3: "three point three",
	}
 
	// 布尔值作为键
	mapBool := map[bool]string{
		true:  "true",
		false: "false",
	}
	fmt.Println(mapInt, mapString, mapFloat64, mapBool)
}

package main
 
import "fmt"
 
func main() {
    type Person struct {
       Name string
       Age  int
    }
 
    alice := &Person{"Alice", 25}
    bob := &Person{"Bob", 30}
 
    mapPointer := map[*Person]string{
       alice: "Alice's pointer",
       bob:   "Bob's pointer",
    }
    fmt.Println(mapPointer)
}

package main
 
import "fmt"
 
type Equalizer interface {
    Equal(Equalizer) bool
}
 
type IntEqualizer int
 
func (i IntEqualizer) Equal(e Equalizer) bool {
    other, ok := e.(IntEqualizer)
    return ok && i == other
}
 
func main() {
    mapInterface := map[Equalizer]string{
       IntEqualizer(1): "one",
       IntEqualizer(2): "two",
       IntEqualizer(3): "three",
    }
    fmt.Println(mapInterface)
}

package main
 
import "fmt"
 
func main() {
    type Point struct {
       X, Y int
    }
 
    mapStruct := map[Point]string{
       {1, 2}: "Point at (1,2)",
       {3, 4}: "Point at (3,4)",
    }
    fmt.Println(mapStruct)
}

package main
 
import "fmt"
 
func main() {
    arr1 := [3]int{1, 2, 3}
    arr2 := [3]int{4, 5, 6}
    mapArray := map[[3]int]string{
       arr1: "123",
       arr2: "456",
    }
    fmt.Println(mapArray)
}