Merge #10645: Use nullptr (C++11) instead of zero (0) as the null pointer constant

36d326e8b Use nullptr instead of zero (0) as the null pointer constant (practicalswift)

Pull request description:

  Use `nullptr` instead of zero (0) as the null pointer constant.

  The road towards `nullptr` (C++11) is split into two PRs:
  * `NULL` → `nullptr` is handled in PR #10483 (scripted)
  * `0` → `nullptr` is handled in PR #10645 (manual, this PR)

  By using the C++11 keyword `nullptr` we are guaranteed a prvalue of type `std::nullptr_t`.

  For a more thorough discussion, see "A name for the null pointer: nullptr" (Sutter &
  Stroustrup), http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2431.pdf

Tree-SHA512: 5412404b40a94ea2d9fc8f81573559c4ffe559749301d486b09d41a7a736345ad602d08ac590930bb00a49692b6075520cf3d543e4da6ccd5b29fa9bcc3f15ea

1 files changed, 7 insertions, 7 deletions

diff --git a/src/httpserver.cpp b/src/httpserver.cpp
index ba3b0d1a68..815d660288 100644
--- a/src/httpserver.cpp
+++ b/src/httpserver.cpp
@@ -164,13 +164,13 @@ struct HTTPPathHandler
 /** HTTP module state */
 
 //! libevent event loop
-static struct event_base* eventBase = 0;
+static struct event_base* eventBase = nullptr;
 //! HTTP server
-struct evhttp* eventHTTP = 0;
+struct evhttp* eventHTTP = nullptr;
 //! List of subnets to allow RPC connections from
 static std::vector<CSubNet> rpc_allow_subnets;
 //! Work queue for handling longer requests off the event loop thread
-static WorkQueue<HTTPClosure>* workQueue = 0;
+static WorkQueue<HTTPClosure>* workQueue = nullptr;
 //! Handlers for (sub)paths
 std::vector<HTTPPathHandler> pathHandlers;
 //! Bound listening sockets
@@ -495,11 +495,11 @@ void StopHTTPServer()
     }
     if (eventHTTP) {
         evhttp_free(eventHTTP);
-        eventHTTP = 0;
+        eventHTTP = nullptr;
     }
     if (eventBase) {
         event_base_free(eventBase);
-        eventBase = 0;
+        eventBase = nullptr;
     }
     LogPrint(BCLog::HTTP, "Stopped HTTP server\n");
 }
@@ -601,9 +601,9 @@ void HTTPRequest::WriteReply(int nStatus, const std::string& strReply)
     evbuffer_add(evb, strReply.data(), strReply.size());
     HTTPEvent* ev = new HTTPEvent(eventBase, true,
         std::bind(evhttp_send_reply, req, nStatus, (const char*)nullptr, (struct evbuffer *)nullptr));
-    ev->trigger(0);
+    ev->trigger(nullptr);
     replySent = true;
-    req = 0; // transferred back to main thread
+    req = nullptr; // transferred back to main thread
 }
 
 CService HTTPRequest::GetPeer()