Why Use a Pointer to a bytes.Buffer When Implementing io.Writer?

bytes.Buffer Implementation of io.Writer

To implement the io.Writer interface, an object must provide a Write method that accepts a byte slice. While bytes.Buffer does implement Write, it's important to note a crucial difference.

In bytes.Buffer, the Write method has a pointer receiver, meaning it operates on the address of the buffer itself. Therefore, to use a bytes.Buffer as an implementation of io.Writer, you must pass a pointer to the buffer, not the buffer itself.

import "bufio"
import "bytes"

func main() {
    var b bytes.Buffer
    foo := bufio.NewWriter(&b)
}

By passing the address of the buffer (&b), you allow the Write method to modify the actual buffer, enabling it to function correctly as an io.Writer.

The above is the detailed content of Why Use a Pointer to a bytes.Buffer When Implementing io.Writer?. For more information, please follow other related articles on the PHP Chinese website!