Add counter to block.populate().

Author: evoskuil

include/bitcoin/system/chain/block.hpp

@@ -137,7 +137,7 @@ class BC_API block
     code confirm(const context& ctx) const NOEXCEPT;
 
     /// Populate previous outputs (only, no metadata) internal to the block.
-    void populate() const NOEXCEPT;
+    size_t populate() const NOEXCEPT;
 
 protected:
     block(const chain::header::cptr& header,

src/chain/block.cpp

@@ -688,7 +688,7 @@ bool block::is_unspent_coinbase_collision() const NOEXCEPT
 }
 
 // Search is not ordered, forward references are caught by block.check.
-void block::populate() const NOEXCEPT
+size_t block::populate() const NOEXCEPT
 {
     std::unordered_map<point, output::cptr> points{};
     uint32_t index{};
@@ -699,16 +699,22 @@ void block::populate() const NOEXCEPT
             points.emplace(std::pair{ point{ (*tx)->hash(false), index++ },
                 out });
 
-    // Populate input prevouts from hash table.
+    // Populate input prevouts from hash table and obtain count.
+    size_t count{};
     for (auto tx = txs_->begin(); tx != txs_->end(); ++tx)
     {
         for (const auto& in: *(*tx)->inputs_ptr())
         {
             const auto point = points.find(in->point());
             if (point != points.end())
+            {
+                ++count;
                 in->prevout = point->second;
+            }
         }
     }
+
+    return count;
 }
 
 // Delegated.