Merge #8353: Trivial: tiny c++11 refactors

c784086 use std::map::emplace() instead of std::map::insert() (whythat)
5e187e7 use c++11 std::unique_ptr instead of boost::shared_ptr (whythat)
947913f use std::map::erase(const_iterator, const_iterator) to get non-constant iterator (whythat)

src/limitedmap.h

@@ -66,8 +66,11 @@ public:
     }
     void update(const_iterator itIn, const mapped_type& v)
     {
-        // TODO: When we switch to C++11, use map.erase(itIn, itIn) to get the non-const iterator.
-        iterator itTarget = map.find(itIn->first);
+        // Using map::erase() with empty range instead of map::find() to get a non-const iterator,
+        // since it is a constant time operation in C++11. For more details, see
+        // https://stackoverflow.com/questions/765148/how-to-remove-constness-of-const-iterator
+        iterator itTarget = map.erase(itIn, itIn);
+        
         if (itTarget == map.end())
             return;
         std::pair<rmap_iterator, rmap_iterator> itPair = rmap.equal_range(itTarget->second);

src/rpc/server.cpp

@@ -25,6 +25,8 @@
 #include <boost/thread.hpp>
 #include <boost/algorithm/string/case_conv.hpp> // for to_upper()
 
+#include <memory> // for unique_ptr
+
 using namespace RPCServer;
 using namespace std;
 
@@ -34,9 +36,8 @@ static std::string rpcWarmupStatus("RPC server started");
 static CCriticalSection cs_rpcWarmup;
 /* Timer-creating functions */
 static RPCTimerInterface* timerInterface = NULL;
-/* Map of name to timer.
- * @note Can be changed to std::unique_ptr when C++11 */
-static std::map<std::string, boost::shared_ptr<RPCTimerBase> > deadlineTimers;
+/* Map of name to timer. */
+static std::map<std::string, std::unique_ptr<RPCTimerBase> > deadlineTimers;
 
 static struct CRPCSignals
 {
@@ -490,7 +491,7 @@ void RPCRunLater(const std::string& name, boost::function<void(void)> func, int6
         throw JSONRPCError(RPC_INTERNAL_ERROR, "No timer handler registered for RPC");
     deadlineTimers.erase(name);
     LogPrint("rpc", "queue run of timer %s in %i seconds (using %s)\n", name, nSeconds, timerInterface->Name());
-    deadlineTimers.insert(std::make_pair(name, boost::shared_ptr<RPCTimerBase>(timerInterface->NewTimer(func, nSeconds*1000))));
+    deadlineTimers.emplace(name, std::unique_ptr<RPCTimerBase>(timerInterface->NewTimer(func, nSeconds*1000)));
 }
 
 CRPCTable tableRPC;