Introduce changeable magnitude weight factors for polling

src/gridcoin/voting/result.cpp

@@ -2,6 +2,7 @@
 // Distributed under the MIT/X11 software license, see the accompanying
 // file COPYING or https://opensource.org/licenses/mit-license.php.
 
+#include "gridcoin/protocol.h"
 #include "main.h"
 #include "gridcoin/beacon.h"
 #include "gridcoin/quorum.h"
@@ -1133,6 +1134,20 @@ CAmount ResolveMoneySupplyForPoll(const Poll& poll)
 
     return pindex->nMoneySupply;
 }
+
+Fraction ResolveMagnitudeWeightFactorForPoll(const Poll& poll)
+{
+    Fraction magnitude_weight_factor(100, 567);
+
+    if (!poll.Expired(pindexBest->nTime)) {
+        ProtocolEntryOption protocol_entry = GetProtocolRegistry().Try("magnitudeweightfactor");
+
+        if (protocol_entry != nullptr) {
+            magnitude_weight_factor = Fraction().FromString(protocol_entry->m_value);
+        }
+    }
+}
+
 } // Anonymous namespace
 
 // -----------------------------------------------------------------------------

src/util.h

@@ -340,6 +340,22 @@ class Fraction {
         return strprintf("%" PRId64 "/" "%" PRId64, m_numerator, m_denominator);
     }
 
+    Fraction FromString(const std::string& string) const
+    {
+        std::vector<std::string> string_fraction = split(string, "/");
+
+        int64_t numerator;
+        int64_t denominator;
+
+        if (string_fraction.size() != 2
+            || !ParseInt64(string_fraction[0], &numerator)
+            || !ParseInt64(string_fraction[1], &denominator)) {
+            throw std::out_of_range("Fraction input string cannot be parsed to fraction.");
+        }
+
+        return Fraction(numerator, denominator);
+    }
+
     bool operator!()
     {
         return IsZero();