1 files changed, 42 insertions, 1 deletions
diff --git a/src/amount.h b/src/amount.h
index 831fa1f6ca..c0d37954cb 100644
--- a/src/amount.h
+++ b/src/amount.h
@@ -6,8 +6,49 @@
 #ifndef BITCOIN_AMOUNT_H
 #define BITCOIN_AMOUNT_H
 
-#include <stdint.h>
+#include "serialize.h"
+
+#include <stdlib.h>
+#include <string>
 
 typedef int64_t CAmount;
 
+static const CAmount COIN = 100000000;
+static const CAmount CENT = 1000000;
+
+/** No amount larger than this (in satoshi) is valid */
+static const CAmount MAX_MONEY = 21000000 * COIN;
+inline bool MoneyRange(const CAmount& nValue) { return (nValue >= 0 && nValue <= MAX_MONEY); }
+
+/** Type-safe wrapper class to for fee rates
+ * (how much to pay based on transaction size)
+ */
+class CFeeRate
+{
+private:
+    CAmount nSatoshisPerK; // unit is satoshis-per-1,000-bytes
+public:
+    CFeeRate() : nSatoshisPerK(0) { }
+    explicit CFeeRate(const CAmount& _nSatoshisPerK): nSatoshisPerK(_nSatoshisPerK) { }
+    CFeeRate(const CAmount& nFeePaid, size_t nSize);
+    CFeeRate(const CFeeRate& other) { nSatoshisPerK = other.nSatoshisPerK; }
+
+    CAmount GetFee(size_t size) const; // unit returned is satoshis
+    CAmount GetFeePerK() const { return GetFee(1000); } // satoshis-per-1000-bytes
+
+    friend bool operator<(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK < b.nSatoshisPerK; }
+    friend bool operator>(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK > b.nSatoshisPerK; }
+    friend bool operator==(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK == b.nSatoshisPerK; }
+    friend bool operator<=(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK <= b.nSatoshisPerK; }
+    friend bool operator>=(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK >= b.nSatoshisPerK; }
+    std::string ToString() const;
+
+    ADD_SERIALIZE_METHODS;
+
+    template <typename Stream, typename Operation>
+    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+        READWRITE(nSatoshisPerK);
+    }
+};
+
 #endif //  BITCOIN_AMOUNT_H