1 files changed, 54 insertions, 0 deletions
diff --git a/src/wallet/coinselection.h b/src/wallet/coinselection.h
new file mode 100644
index 0000000000..4d1a43bc17
--- /dev/null
+++ b/src/wallet/coinselection.h
@@ -0,0 +1,54 @@
+// Copyright (c) 2017 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_COINSELECTION_H
+#define BITCOIN_COINSELECTION_H
+
+#include <amount.h>
+#include <primitives/transaction.h>
+#include <random.h>
+
+//! target minimum change amount
+static const CAmount MIN_CHANGE = CENT;
+//! final minimum change amount after paying for fees
+static const CAmount MIN_FINAL_CHANGE = MIN_CHANGE/2;
+
+class CInputCoin {
+public:
+    CInputCoin(const CTransactionRef& tx, unsigned int i)
+    {
+        if (!tx)
+            throw std::invalid_argument("tx should not be null");
+        if (i >= tx->vout.size())
+            throw std::out_of_range("The output index is out of range");
+
+        outpoint = COutPoint(tx->GetHash(), i);
+        txout = tx->vout[i];
+        effective_value = txout.nValue;
+    }
+
+    COutPoint outpoint;
+    CTxOut txout;
+    CAmount effective_value;
+    CAmount fee = 0;
+    CAmount long_term_fee = 0;
+
+    bool operator<(const CInputCoin& rhs) const {
+        return outpoint < rhs.outpoint;
+    }
+
+    bool operator!=(const CInputCoin& rhs) const {
+        return outpoint != rhs.outpoint;
+    }
+
+    bool operator==(const CInputCoin& rhs) const {
+        return outpoint == rhs.outpoint;
+    }
+};
+
+bool SelectCoinsBnB(std::vector<CInputCoin>& utxo_pool, const CAmount& target_value, const CAmount& cost_of_change, std::set<CInputCoin>& out_set, CAmount& value_ret, CAmount not_input_fees);
+
+// Original coin selection algorithm as a fallback
+bool KnapsackSolver(const CAmount& nTargetValue, std::vector<CInputCoin>& vCoins, std::set<CInputCoin>& setCoinsRet, CAmount& nValueRet);
+#endif // BITCOIN_COINSELECTION_H