var ErrNotPollable = errors.New("not pollable")

// consume removes data from a slice of byte slices, for writev.
func consume(v *[][]byte, n int64) {
	for len(*v) > 0 {
		ln0 := int64(len((*v)[0]))
		if ln0 > n {
			(*v)[0] = (*v)[0][n:]
			return
		}
		n -= ln0
		(*v)[0] = nil
		*v = (*v)[1:]
	}
}

// TestHookDidWritev is a hook for testing writev.
var TestHookDidWritev = func(wrote int) {}

		p = p[n0:]
		n += n0
	}
	if len(*v) == 0 {
		err = io.EOF
	}
	return
}

func (v *Buffers) consume(n int64) {
	for len(*v) > 0 {
		ln0 := int64(len((*v)[0]))
		if ln0 > n {
			(*v)[0] = (*v)[0][n:]
			return
		}
		n -= ln0
		(*v)[0] = nil
		*v = (*v)[1:]
	}