opt: reuse var leafPageElementSize (#215)

chyroc · web-flow · commit a8af23b57f67 · 2020-04-23T17:56:04.000-07:00
diff --git a/page.go b/page.go
@@ -56,7 +56,7 @@ func (p *page) meta() *meta {
 
 // leafPageElement retrieves the leaf node by index
 func (p *page) leafPageElement(index uint16) *leafPageElement {
-	off := uintptr(index) * unsafe.Sizeof(leafPageElement{})
+	off := uintptr(index) * leafPageElementSize
 	return (*leafPageElement)(unsafe.Pointer(uintptr(unsafe.Pointer(p)) + unsafe.Sizeof(*p) + off))
 }
 

Original file line number	Diff line number	Diff line change
`@@ -56,7 +56,7 @@ func (p page) meta() meta {`
`56`	`56`
`57`	`57`	`// leafPageElement retrieves the leaf node by index`
`58`	`58`	`func (p page) leafPageElement(index uint16) leafPageElement {`
`59`		`- off := uintptr(index) * unsafe.Sizeof(leafPageElement{})`
	`59`	`+ off := uintptr(index) * leafPageElementSize`
`60`	`60`	`return (leafPageElement)(unsafe.Pointer(uintptr(unsafe.Pointer(p)) + unsafe.Sizeof(p) + off))`
`61`	`61`	`}`
`62`	`62`