Merge pull request #6418

e5214a2ca Adding ZMQ/Pub support for txpool_add and chain_main events (Lee Clagett)

1 files changed, 7 insertions, 2 deletions

diff --git a/src/cryptonote_core/blockchain.h b/src/cryptonote_core/blockchain.h
index fb7e5c4f8..703dd6400 100644
--- a/src/cryptonote_core/blockchain.h
+++ b/src/cryptonote_core/blockchain.h
@@ -30,6 +30,7 @@
 
 #pragma once
 #include <boost/asio/io_service.hpp>
+#include <boost/function/function_fwd.hpp>
 #include <boost/serialization/serialization.hpp>
 #include <boost/serialization/version.hpp>
 #include <boost/serialization/list.hpp>
@@ -764,7 +765,7 @@ namespace cryptonote
      *
      * @param notify the notify object to call at every new block
      */
-    void set_block_notify(const std::shared_ptr<tools::Notify> &notify) { m_block_notify = notify; }
+    void add_block_notify(boost::function<void(std::uint64_t, epee::span<const block>)> &&notify);
 
     /**
      * @brief sets a reorg notify object to call for every reorg
@@ -1125,7 +1126,11 @@ namespace cryptonote
 
     bool m_batch_success;
 
-    std::shared_ptr<tools::Notify> m_block_notify;
+    /* `boost::function` is used because the implementation never allocates if
+       the callable object has a single `std::shared_ptr` or `std::weap_ptr`
+       internally. Whereas, the libstdc++ `std::function` will allocate. */
+
+    std::vector<boost::function<void(std::uint64_t, epee::span<const block>)>> m_block_notifiers;
     std::shared_ptr<tools::Notify> m_reorg_notify;
 
     // for prepare_handle_incoming_blocks