fix String methods

SadPencil · SadPencil · commit 23246486a982 · 2019-02-21T00:11:48.000+08:00
diff --git a/bn256/bn256.go b/bn256/bn256.go
@@ -55,7 +55,7 @@ func RandomG1(r io.Reader) (*big.Int, *G1, error) {
 
 func (e *G1) String() string {
 	if e.p == nil {
-		e.p = newCurvePoint(nil)
+		return "bn256.G1" + newCurvePoint(nil).String()
 	}
 	return "bn256.G1" + e.p.String()
 }
@@ -179,7 +179,7 @@ func RandomG2(r io.Reader) (*big.Int, *G2, error) {
 
 func (e *G2) String() string {
 	if e.p == nil {
-		e.p = newTwistPoint(nil)
+		return "bn256.G2" + newTwistPoint(nil).String()
 	}
 	return "bn256.G2" + e.p.String()
 }
@@ -285,7 +285,7 @@ type GT struct {
 
 func (e *GT) String() string {
 	if e.p == nil {
-		e.p = newGFp12(nil)
+		return "bn256.GT" + newGFp12(nil).String()
 	}
 	return "bn256.GT" + e.p.String()
 }

Original file line number	Diff line number	Diff line change
`@@ -55,7 +55,7 @@ func RandomG1(r io.Reader) (big.Int, G1, error) {`
`55`	`55`
`56`	`56`	`func (e *G1) String() string {`
`57`	`57`	`if e.p == nil {`
`58`		`- e.p = newCurvePoint(nil)`
	`58`	`+ return "bn256.G1" + newCurvePoint(nil).String()`
`59`	`59`	`}`
`60`	`60`	`return "bn256.G1" + e.p.String()`
`61`	`61`	`}`
`@@ -179,7 +179,7 @@ func RandomG2(r io.Reader) (big.Int, G2, error) {`
`179`	`179`
`180`	`180`	`func (e *G2) String() string {`
`181`	`181`	`if e.p == nil {`
`182`		`- e.p = newTwistPoint(nil)`
	`182`	`+ return "bn256.G2" + newTwistPoint(nil).String()`
`183`	`183`	`}`
`184`	`184`	`return "bn256.G2" + e.p.String()`
`185`	`185`	`}`
`@@ -285,7 +285,7 @@ type GT struct {`
`285`	`285`
`286`	`286`	`func (e *GT) String() string {`
`287`	`287`	`if e.p == nil {`
`288`		`- e.p = newGFp12(nil)`
	`288`	`+ return "bn256.GT" + newGFp12(nil).String()`
`289`	`289`	`}`
`290`	`290`	`return "bn256.GT" + e.p.String()`
`291`	`291`	`}`