wallet2: "output lineup" fake out selection

Based on python code by sarang:
https://github.com/SarangNoether/skunkworks/blob/outputs/outputs/simulate.py

1 files changed, 25 insertions, 0 deletions

diff --git a/src/wallet/wallet2.h b/src/wallet/wallet2.h
index 8561c42ba..d101e87f5 100644
--- a/src/wallet/wallet2.h
+++ b/src/wallet/wallet2.h
@@ -39,6 +39,7 @@
 #include <boost/serialization/deque.hpp>
 #include <boost/thread/lock_guard.hpp>
 #include <atomic>
+#include <random>
 
 #include "include_base_utils.h"
 #include "cryptonote_basic/account.h"
@@ -76,6 +77,30 @@ namespace tools
   class wallet2;
   class Notify;
 
+  class gamma_picker
+  {
+  public:
+    uint64_t pick();
+    gamma_picker(const std::vector<uint64_t> &rct_offsets);
+    gamma_picker(const std::vector<uint64_t> &rct_offsets, double shape, double scale);
+
+  private:
+    struct gamma_engine
+    {
+      typedef uint64_t result_type;
+      static constexpr result_type min() { return 0; }
+      static constexpr result_type max() { return std::numeric_limits<result_type>::max(); }
+      result_type operator()() { return crypto::rand<result_type>(); }
+    } engine;
+
+private:
+    std::gamma_distribution<double> gamma;
+    const std::vector<uint64_t> &rct_offsets;
+    const uint64_t *begin, *end;
+    uint64_t num_rct_outputs;
+    double average_output_time;
+  };
+
   class wallet_keys_unlocker
   {
   public: