Why Doesn't `bytes.Buffer` Implement `io.Writer` Directly in Go?

"bytes.Buffer" and the "io.Writer" Interface for Go

Question: When attempting to implement the "io.Writer" interface with a "bytes.Buffer" object in Go, an error message "bytes.Buffer does not implement io.Writer" is encountered. How can this error be resolved?

Answer:

To resolve this error, a pointer to the "bytes.Buffer" should be passed instead of the buffer itself. This is because the "Write" method of the "io.Writer" interface has a pointer receiver, while the "bytes.Buffer" type has a value receiver for its "Write" method.

Here's an example that demonstrates how to correctly implement this:

import "bufio"
import "bytes"

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

By passing a pointer to the "bytes.Buffer", the code can correctly implement the "io.Writer" interface, as it is now using the pointer receiver form of the "Write" method.

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