GODRIVER-94 Change readpref.Primary() to return constant

saghm · saghm · commit 18258e579f82 · 2018-03-05T14:16:19.000-05:00
Change-Id: I8ab5cd88083a981f43890b0c38977889005e923c
diff --git a/mongo/readpref/readpref.go b/mongo/readpref/readpref.go
@@ -17,9 +17,11 @@ var (
 	errInvalidReadPreference = errors.New("can not specify tags or max staleness on primary")
 )
 
+var primary = ReadPref{mode: PrimaryMode}
+
 // Primary constructs a read preference with a PrimaryMode.
 func Primary() *ReadPref {
-	return &ReadPref{mode: PrimaryMode}
+	return &primary
 }
 
 // PrimaryPreferred constructs a read preference with a PrimaryPreferredMode.

Original file line number	Diff line number	Diff line change
`@@ -17,9 +17,11 @@ var (`
`17`	`17`	`errInvalidReadPreference = errors.New("can not specify tags or max staleness on primary")`
`18`	`18`	`)`
`19`	`19`
	`20`	`+var primary = ReadPref{mode: PrimaryMode}`
	`21`	`+`
`20`	`22`	`// Primary constructs a read preference with a PrimaryMode.`
`21`	`23`	`func Primary() *ReadPref {`
`22`		`- return &ReadPref{mode: PrimaryMode}`
	`24`	`+ return &primary`
`23`	`25`	`}`
`24`	`26`
`25`	`27`	`// PrimaryPreferred constructs a read preference with a PrimaryPreferredMode.`