Go package that adds Close to Reader/Writer

withcloser_reader.go

package withcloser

import "io"

type reader struct {
	io.Reader
	close func() error
}

func (r reader) Close() error {
	return r.close()
}

func Reader(r io.Reader, close func() error) io.ReadCloser {
	return reader{
		Reader: r,
		close:  close,
	}
}

withcloser_writer.go.go

package withcloser

import "io"

type writer struct {
	io.Writer
	close func() error
}

func (w writer) Close() error {
	return w.close()
}

func Writer(w io.Writer, close func() error) io.WriteCloser {
	return writer{
		Writer: w,
		close:  close,
	}
}