Provide count of segregated txs.

Author: evoskuil

include/bitcoin/system/chain/block.hpp

@@ -98,6 +98,7 @@ class BC_API block
     bool is_segregated() const NOEXCEPT;
     size_t serialized_size(bool witness) const NOEXCEPT;
     size_t signature_operations(bool bip16, bool bip141) const NOEXCEPT;
+    size_t segregated() const NOEXCEPT;
 
     /// Computed malleation properties.
     bool is_malleable() const NOEXCEPT;

src/chain/block.cpp

@@ -587,6 +587,16 @@ bool block::is_segregated() const NOEXCEPT
     return std::any_of(txs_->begin(), txs_->end(), segregated);
 }
 
+size_t block::segregated() const NOEXCEPT
+{
+    const auto count_segregated = [](const auto& tx) NOEXCEPT
+    {
+        return tx->is_segregated();
+    };
+
+    return std::count_if(txs_->begin(), txs_->end(), count_segregated);
+}
+
 // The witness merkle root is obtained from wtxids, subject to malleation just
 // as the txs commitment. However, since tx duplicates are precluded by the
 // malleable32 (or complete) block check, there is no opportunity for this.

test/chain/block.cpp

@@ -460,6 +460,7 @@ BOOST_AUTO_TEST_CASE(block__hash__default__matches_header_hash)
 // is_malleable
 // is_segregated
 // serialized_size
+// segregated
 
 // validation (public)
 // ----------------------------------------------------------------------------