[Core] Introduce CMoneySupply class

random-zebra · random-zebra · commit ed591d6433b7 · 2020-10-11T13:56:24.000+02:00
Dumb storage class. This will be used to cache the sum of spendable
transaction outputs (and the height of the chain when this sum was last
updated).
diff --git a/src/Makefile.am b/src/Makefile.am
@@ -211,6 +211,7 @@ BITCOIN_CORE_H = \
   merkleblock.h \
   messagesigner.h \
   miner.h \
+  moneysupply.h \
   net.h \
   net_processing.h \
   netaddress.h \
diff --git a/src/moneysupply.h b/src/moneysupply.h
@@ -0,0 +1,35 @@
+// Copyright (c) 2020 The PIVX developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or https://www.opensource.org/licenses/mit-license.php.
+
+#ifndef PIVX_MONEYSUPPLY_H
+#define PIVX_MONEYSUPPLY_H
+
+#include "amount.h"
+#include "sync.h"
+
+/*
+ * Class used to cache the sum of utxo's values
+ */
+class CMoneySupply {
+private:
+    mutable RecursiveMutex cs;
+    CAmount nSupply;
+    // height of the chain when the supply was last updated
+    int64_t nHeight;
+
+public:
+    CMoneySupply(): nSupply(0), nHeight(0) {}
+
+    void Update(const CAmount& _nSupply, int _nHeight)
+    {
+        LOCK(cs);
+        nSupply = _nSupply;
+        nHeight = _nHeight;
+    }
+
+    CAmount Get() const { LOCK(cs); return nSupply; }
+    int64_t GetCacheHeight() const { LOCK(cs); return nHeight; }
+};
+
+#endif // PIVX_MONEYSUPPLY_H
