From e5214a2ca22cecf123bcff1ab441ed0415d08a6f Mon Sep 17 00:00:00 2001
From: Lee Clagett <code@leeclagett.com>
Date: Mon, 16 Mar 2020 23:59:26 +0000
Subject: Adding ZMQ/Pub support for txpool_add and chain_main events

---
 src/cryptonote_core/blockchain.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'src/cryptonote_core/blockchain.h')

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
-- 
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