From e700cd0bc885340563df9e6b7a5b6c6603b8c984 Mon Sep 17 00:00:00 2001
From: Jeremy Rubin <jeremy.l.rubin@gmail.com>
Date: Sun, 19 Jun 2016 21:42:15 -0400
Subject: [PATCH] Convert ForEachNode* functions to take a templated function
 argument rather than a std::function to eliminate std::function overhead

---
 src/net.cpp | 73 -------------------------------------------------
 src/net.h   | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++++++------
 2 files changed, 82 insertions(+), 81 deletions(-)

diff --git a/src/net.cpp b/src/net.cpp
index bf5cc07db..19c14e105 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -2697,79 +2697,6 @@ bool CConnman::ForNode(NodeId id, std::function<bool(CNode* pnode)> func)
     return found != nullptr && func(found);
 }
 
-bool CConnman::ForEachNodeContinueIf(std::function<bool(CNode* pnode)> func)
-{
-    LOCK(cs_vNodes);
-    for (auto&& node : vNodes)
-        if(!func(node))
-            return false;
-    return true;
-}
-
-bool CConnman::ForEachNodeContinueIf(std::function<bool(const CNode* pnode)> func) const
-{
-    LOCK(cs_vNodes);
-    for (const auto& node : vNodes)
-        if(!func(node))
-            return false;
-    return true;
-}
-
-bool CConnman::ForEachNodeContinueIfThen(std::function<bool(CNode* pnode)> pre, std::function<void()> post)
-{
-    bool ret = true;
-    LOCK(cs_vNodes);
-    for (auto&& node : vNodes)
-        if(!pre(node)) {
-            ret = false;
-            break;
-        }
-    post();
-    return ret;
-}
-
-bool CConnman::ForEachNodeContinueIfThen(std::function<bool(const CNode* pnode)> pre, std::function<void()> post) const
-{
-    bool ret = true;
-    LOCK(cs_vNodes);
-    for (const auto& node : vNodes)
-        if(!pre(node)) {
-            ret = false;
-            break;
-        }
-    post();
-    return ret;
-}
-
-void CConnman::ForEachNode(std::function<void(CNode* pnode)> func)
-{
-    LOCK(cs_vNodes);
-    for (auto&& node : vNodes)
-        func(node);
-}
-
-void CConnman::ForEachNode(std::function<void(const CNode* pnode)> func) const
-{
-    LOCK(cs_vNodes);
-    for (const auto& node : vNodes)
-        func(node);
-}
-
-void CConnman::ForEachNodeThen(std::function<void(CNode* pnode)> pre, std::function<void()> post)
-{
-    LOCK(cs_vNodes);
-    for (auto&& node : vNodes)
-		pre(node);
-    post();
-}
-
-void CConnman::ForEachNodeThen(std::function<void(const CNode* pnode)> pre, std::function<void()> post) const
-{
-    LOCK(cs_vNodes);
-    for (const auto& node : vNodes)
-		pre(node);
-    post();
-}
 int64_t PoissonNextSend(int64_t nNow, int average_interval_seconds) {
     return nNow + (int64_t)(log1p(GetRand(1ULL << 48) * -0.0000000000000035527136788 /* -1/2^48 */) * average_interval_seconds * -1000000.0 + 0.5);
 }
diff --git a/src/net.h b/src/net.h
index 6ee0430f2..97604ca56 100644
--- a/src/net.h
+++ b/src/net.h
@@ -129,14 +129,88 @@ public:
     bool CheckIncomingNonce(uint64_t nonce);
 
     bool ForNode(NodeId id, std::function<bool(CNode* pnode)> func);
-    bool ForEachNodeContinueIf(std::function<bool(CNode* pnode)> func);
-    bool ForEachNodeContinueIf(std::function<bool(const CNode* pnode)> func) const;
-    bool ForEachNodeContinueIfThen(std::function<bool(CNode* pnode)> pre, std::function<void()> post);
-    bool ForEachNodeContinueIfThen(std::function<bool(const CNode* pnode)> pre, std::function<void()> post) const;
-    void ForEachNode(std::function<void(CNode* pnode)> func);
-    void ForEachNode(std::function<void(const CNode* pnode)> func) const;
-    void ForEachNodeThen(std::function<void(CNode* pnode)> pre, std::function<void()> post);
-    void ForEachNodeThen(std::function<void(const CNode* pnode)> pre, std::function<void()> post) const;
+
+    template<typename Callable>
+    bool ForEachNodeContinueIf(Callable&& func)
+    {
+        LOCK(cs_vNodes);
+        for (auto&& node : vNodes)
+            if(!func(node))
+                return false;
+        return true;
+    };
+
+    template<typename Callable>
+    bool ForEachNodeContinueIf(Callable&& func) const
+    {
+        LOCK(cs_vNodes);
+        for (const auto& node : vNodes)
+            if(!func(node))
+                return false;
+        return true;
+    };
+
+    template<typename Callable, typename CallableAfter>
+    bool ForEachNodeContinueIfThen(Callable&& pre, CallableAfter&& post)
+    {
+        bool ret = true;
+        LOCK(cs_vNodes);
+        for (auto&& node : vNodes)
+            if(!pre(node)) {
+                ret = false;
+                break;
+            }
+        post();
+        return ret;
+    };
+
+    template<typename Callable, typename CallableAfter>
+    bool ForEachNodeContinueIfThen(Callable&& pre, CallableAfter&& post) const
+    {
+        bool ret = true;
+        LOCK(cs_vNodes);
+        for (const auto& node : vNodes)
+            if(!pre(node)) {
+                ret = false;
+                break;
+            }
+        post();
+        return ret;
+    };
+
+    template<typename Callable>
+    void ForEachNode(Callable&& func)
+    {
+        LOCK(cs_vNodes);
+        for (auto&& node : vNodes)
+            func(node);
+    };
+
+    template<typename Callable>
+    void ForEachNode(Callable&& func) const
+    {
+        LOCK(cs_vNodes);
+        for (const auto& node : vNodes)
+            func(node);
+    };
+
+    template<typename Callable, typename CallableAfter>
+    void ForEachNodeThen(Callable&& pre, CallableAfter&& post)
+    {
+        LOCK(cs_vNodes);
+        for (auto&& node : vNodes)
+            pre(node);
+        post();
+    };
+
+    template<typename Callable, typename CallableAfter>
+    void ForEachNodeThen(Callable&& pre, CallableAfter&& post) const
+    {
+        LOCK(cs_vNodes);
+        for (const auto& node : vNodes)
+            pre(node);
+        post();
+    };
 
     void RelayTransaction(const CTransaction& tx);
 
-- 
2.11.4.GIT