Discuss the characteristics of non-addressable numeric values ​​in Go language

Go language is a compiled and highly concurrency programming language. It has the characteristics of efficiency and simplicity and has been widely used. In the Go language, there is a feature that is an unaddressable value, that is, a value whose memory address cannot be obtained. This article discusses this feature and illustrates its application and impact through specific code examples.

In the Go language, there are some data types that are non-addressable values, such as constants, literals and expressions. These data types are not addressable in computer memory, and programs cannot obtain their exact memory addresses. The main function of this feature in the Go language is to ensure the safety and stability of the program and prevent the program from improperly operating data that should not be modified.

Below we use several specific code examples to explore the characteristics of non-addressable values.

First, we define a constant and try to get its memory address:

package main

import "fmt"

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

In the above code, we define a constant a and try to get a through the &a statement memory address, but a compilation error message indicates that the memory address of the constant cannot be obtained. This shows that in the Go language, constants are non-addressable values ​​and their memory addresses cannot be obtained directly.

Next, we try to get the address of the literal:

package main

import "fmt"

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

In the above code, we try to get the address of the literal 10, and a compilation error will also occur. This shows that in the Go language, literals are also non-addressable values ​​and their memory addresses cannot be obtained.

Finally, we try to get the address of the result of the expression:

package main

import "fmt"

func main() {
    a, b := 10, 20
    fmt.Println(&(a + b)) // 编译报错：cannot take the address of a + b
}

In the above code, we define two variables a and b, and try to get their sum Address operations will also cause compilation errors. This shows that in the Go language, the result of an expression is also an unaddressable value and its memory address cannot be obtained directly.

To sum up, non-addressable values ​​are a feature of the Go language, which limits the memory address acquisition of some data types to ensure the stability and security of the program. During the programming process, we should pay attention to the impact of this feature and avoid improper operations on unaddressable values ​​to ensure the correct operation of the program.

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