Function NewSwapAt

swap.go:27–32

NewSwapAt creates a BufferAt which writes to a until you write past a.Cap() then it io.Copy's from a to b and writes to b. Once the Buffer is empty again, it starts over writing to a. Note that if b.Cap() <= a.Cap() it will cause a panic, b is expected to be larger in order to accommodate writes pas

(a, b BufferAt)

// Note that if b.Cap() <= a.Cap() it will cause a panic, b is expected
// to be larger in order to accommodate writes past a.Cap().
func NewSwapAt(a, b BufferAt) BufferAt {
	if b.Cap() <= a.Cap() {
		panic("Buffer b must be larger than a.")
	}
	return &swap{A: a, B: b}
}

func (buf *swap) Len() int64 {
	return buf.A.Len() + buf.B.Len()