add NewCrossInViewpoint

diff --git a/protocol/state/cross_in_view.go b/protocol/state/cross_in_view.go
index e7391bd..26f2838 100644 (file)
--- a/protocol/state/cross_in_view.go
+++ b/protocol/state/cross_in_view.go
@@ -1,5 +1,15 @@
 package state
 
+import (
+       "github.com/vapor/protocol/bc"
+)
+
 type CrossInViewpoint struct {
        Entries map[bc.Hash]bool
 }
+
+func NewCrossInViewpoint() *CrossInViewpoint {
+       return &CrossInViewpoint{
+               Entries: make(map[bc.Hash]bool),
+       }
+}