ReadCloser implements io.ReadCloser by reading from a particular io.Reader and then calling the provided "Close()" method.
type ReadCloser struct {
io.Reader
CloseFunc func() error
}
func (rac *ReadCloser) Close() error
Close implements io.ReadCloser
WriteCloser implements io.WriteCloser by reading from a particular io.Writer and then calling the provided "Close()" method.
type WriteCloser struct {
io.Writer
CloseFunc func() error
}
func (wac *WriteCloser) Close() error
Close implements io.WriteCloser