Research on unaddressable numerical values ​​in Go language

Exploration of non-addressable numerical values ​​in Go language

In Go language, there are some non-addressable numerical types, that is, the value of their address cannot be obtained. These non-addressable values ​​can cause some confusion and errors during programming, so it is necessary to delve into them and understand their characteristics and usage.

1. The concept of non-addressable numerical values

In the Go language, some numerical types are not addressable, that is, they cannot be obtained using the addressing operator& its memory address. These non-addressable numeric types include but are not limited to the following:

1. Constant
2. Literal value
3. Expression )

These non-addressable numerical types usually cannot be modified, so the compiler will prohibit addressing operations on them to ensure the stability and safety of the program.

2. Characteristics of non-addressable values ​​

1. Constant (constant)

Constant is not addressable in Go language because of constant The value is determined at compile time and cannot be changed while the program is running. Therefore, constants cannot be addressed and cannot be modified.

package main

import "fmt"

func main() {
    const a = 10
    // fmt.Println(&a) // 编译报错：cannot take the address of a
}

2. Literal value

Literal value is an expression that represents a fixed value, such as integer, floating point, string, etc. Literals are also not addressable in the Go language, because literals have no specific memory address and are just a temporary value.

package main

import "fmt"

func main() {
    fmt.Println(&10) // 编译报错：cannot take the address of 10
}

3. Expression (expression)

Some expressions are also not addressable in the Go language, such as some temporary variables or calculations that do not have specific memory addresses. result.

package main

import "fmt"

func main() {
    sum := 2 + 3
    // fmt.Println(&sum) // 编译报错：cannot take the address of sum
}

3. How to deal with non-addressable numerical values

Although the non-addressable numerical type cannot directly obtain its address, it can be processed in some ways, such as assigning it to An addressable variable, and then access the variable.

package main

import "fmt"

func main() {
    num := 10
    p := &num
    fmt.Println(*p) // 输出：10
}

In the above code, we assign the non-addressable num to the addressable variable p, and then pass p The value of num was obtained. This can bypass the limitation that non-addressable values ​​cannot directly obtain the address.

Summary:

Unaddressable numerical types exist in the Go language, including constants, literals and certain expressions. The address of these non-addressable values ​​cannot be obtained directly, but some tricks can be used to bypass the restriction and handle them. During the programming process, we need to pay attention to the characteristics of non-addressable values ​​and choose appropriate methods to handle these values ​​to ensure the correctness and stability of the program.

Through the exploration of this article, I believe that readers have a deeper understanding of non-addressable values ​​​​in the Go language. I hope it will be helpful to everyone's study and work.

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