Which values are not addressable in Golang
cannot be addressed, which means that its address cannot be obtained through &. (Recommended Learning: Go )
# 不 can be summarized as: non -changing, temporary results and unsafe. If any of these conditions are met, it is not addressable.
Specifically:
package main type Named interface { // Name 用于获取名字。 Name() string } type Dog struct { name string } func (dog *Dog) SetName(name string) { dog.name = name } func (dog Dog) Name() string { return dog.name } func main() { // 示例1。 const num = 123 //_ = &num // 常量不可寻址。 //_ = &(123) // 基本类型值的字面量不可寻址。 var str = "abc" _ = str //_ = &(str[0]) // 对字符串变量的索引结果值不可寻址。 //_ = &(str[0:2]) // 对字符串变量的切片结果值不可寻址。 str2 := str[0] _ = &str2 // 但这样的寻址就是合法的。 //_ = &(123 + 456) // 算术操作的结果值不可寻址。 num2 := 456 _ = num2 //_ = &(num + num2) // 算术操作的结果值不可寻址。 //_ = &([3]int{1, 2, 3}[0]) // 对数组字面量的索引结果值不可寻址。 //_ = &([3]int{1, 2, 3}[0:2]) // 对数组字面量的切片结果值不可寻址。 _ = &([]int{1, 2, 3}[0]) // 对切片字面量的索引结果值却是可寻址的。 //_ = &([]int{1, 2, 3}[0:2]) // 对切片字面量的切片结果值不可寻址。 //_ = &(map[int]string{1: "a"}[0]) // 对字典字面量的索引结果值不可寻址。 var map1 = map[int]string{1: "a", 2: "b", 3: "c"} _ = map1 //_ = &(map1[2]) // 对字典变量的索引结果值不可寻址。 //_ = &(func(x, y int) int { // return x + y //}) // 字面量代表的函数不可寻址。 //_ = &(fmt.Sprintf) // 标识符代表的函数不可寻址。 //_ = &(fmt.Sprintln("abc")) // 对函数的调用结果值不可寻址。 dog := Dog{"little pig"} _ = dog //_ = &(dog.Name) // 标识符代表的函数不可寻址。 //_ = &(dog.Name()) // 对方法的调用结果值不可寻址。 //_ = &(Dog{"little pig"}.name) // 结构体字面量的字段不可寻址。 //_ = &(interface{}(dog)) // 类型转换表达式的结果值不可寻址。 dogI := interface{}(dog) _ = dogI //_ = &(dogI.(Named)) // 类型断言表达式的结果值不可寻址。 named := dogI.(Named) _ = named //_ = &(named.(Dog)) // 类型断言表达式的结果值不可寻址。 var chan1 = make(chan int, 1) chan1 <- 1 //_ = &(<-chan1) // 接收表达式的结果值不可寻址。 }
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