Method WriteAt

memsys/iosgl.go:245–253

NOTE assert and use with caution.

(p []byte, off int64)

// NOTE assert and use with caution.
func (z *SGL) WriteAt(p []byte, off int64) (n int, err error) {
	debug.Assert(z.woff >= off+int64(len(p)))

	prevWriteOff := z.woff
	z.woff = off
	n, err = z.Write(p)
	z.woff = prevWriteOff
	return n, err
}

// reuse already allocated SGL (compare with Reader below)
func (z *SGL) Reset() { z.woff, z.roff = 0, 0 }