Detailed explanation of Go pointer type methods to improve code efficiency

In Go, the pointer type method can operate the variable pointed to by the pointer address without creating a copy, improving code efficiency. When defining a pointer type method, add an asterisk before the method name, such as func (p *Person) Greet() {}. Its advantages include: reducing memory allocation, directly manipulating the underlying data, and allowing modification of structure pointer receivers. Note that you need to ensure that the pointer points to a valid address, and pointer variables need to be used when passing pointer type methods.

Detailed explanation of Go pointer type methods to improve code efficiency

In Go, the pointer type is a special type that refers to the memory address of another variable . Pointer type methods are designed to operate on this address without creating a copy. This can significantly improve code efficiency and performance.

Define pointer type method

To define a pointer type method, just add an asterisk (*) before the method name, for example:

type Person struct {
    Name string
}

func (p *Person) Greet() {
    fmt.Println("Hello, my name is", p.Name)
}

Person The Greet method of type is a pointer type method that accepts a *Person type pointer as its receiver.

Practical Case

Case: Efficiently Modify Slice Elements

Suppose we have a []int type slice, and Want to modify every element in it. Using ordinary methods will create new slices, causing unnecessary memory allocation and copying:

func ModifySlice(slice []int) {
    for i, v := range slice {
        slice[i] = v + 1
    }
}

Using pointer type methods, we can directly modify the underlying array of the slice to avoid unnecessary copying:

func ModifySlice(slice *[]int) {
    for i, v := range *slice {
        (*slice)[i] = v + 1
    }
}

Advantages of pointer type methods

• Reduce memory allocation and copying and improve performance.
• Allows direct manipulation of underlying data.
• The pointer receiver of the structure can be modified.

Notes

• Make sure that the pointer receiver points to a valid address.
• When passing pointer type methods, you need to use pointer variables (excluding the * prefix).
• Pointer type methods can only be defined for pointer types.

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