core: Add a new structure `Position` and move `ShardID`, `ChainID` and `Height` from `Block` (#89)

1 files changed, 25 insertions, 0 deletions

diff --git a/core/types/position.go b/core/types/position.go
new file mode 100644
index 0000000..a894c4b
--- /dev/null
+++ b/core/types/position.go
@@ -0,0 +1,25 @@
+// Copyright 2018 The dexon-consensus-core Authors
+// This file is part of the dexon-consensus-core library.
+//
+// The dexon-consensus-core library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus-core library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus-core library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package types
+
+// Position describes the position in the block lattice of an entity.
+type Position struct {
+	ShardID uint32 `json:"shard_id"`
+	ChainID uint32 `json:"chain_id"`
+	Height  uint64 `json:"height"`
+}