auto_ptr → unique_ptr

Change the few occurrences of the deprecated `auto_ptr` to c++11 `unique_ptr`.
Silences the deprecation warnings.

Also add a missing `std::` for consistency.

src/httpserver.cpp

@@ -252,7 +252,7 @@ static std::string RequestMethodString(HTTPRequest::RequestMethod m)
 /** HTTP request callback */
 static void http_request_cb(struct evhttp_request* req, void* arg)
 {
-    std::auto_ptr<HTTPRequest> hreq(new HTTPRequest(req));
+    std::unique_ptr<HTTPRequest> hreq(new HTTPRequest(req));
 
     LogPrint("http", "Received a %s request for %s from %s\n",
              RequestMethodString(hreq->GetRequestMethod()), hreq->GetURI(), hreq->GetPeer().ToString());
@@ -288,7 +288,7 @@ static void http_request_cb(struct evhttp_request* req, void* arg)
 
     // Dispatch to worker thread
     if (i != iend) {
-        std::auto_ptr<HTTPWorkItem> item(new HTTPWorkItem(hreq.release(), path, i->handler));
+        std::unique_ptr<HTTPWorkItem> item(new HTTPWorkItem(hreq.release(), path, i->handler));
         assert(workQueue);
         if (workQueue->Enqueue(item.get()))
             item.release(); /* if true, queue took ownership */

src/miner.cpp

@@ -74,7 +74,7 @@ int64_t UpdateTime(CBlockHeader* pblock, const Consensus::Params& consensusParam
 CBlockTemplate* CreateNewBlock(const CChainParams& chainparams, const CScript& scriptPubKeyIn)
 {
     // Create new block
-    auto_ptr<CBlockTemplate> pblocktemplate(new CBlockTemplate());
+    std::unique_ptr<CBlockTemplate> pblocktemplate(new CBlockTemplate());
     if(!pblocktemplate.get())
         return NULL;
     CBlock *pblock = &pblocktemplate->block; // pointer for convenience

src/rpc/mining.cpp

@@ -111,7 +111,7 @@ UniValue generateBlocks(boost::shared_ptr<CReserveScript> coinbaseScript, int nG
     UniValue blockHashes(UniValue::VARR);
     while (nHeight < nHeightEnd)
     {
-        auto_ptr<CBlockTemplate> pblocktemplate(CreateNewBlock(Params(), coinbaseScript->reserveScript));
+        std::unique_ptr<CBlockTemplate> pblocktemplate(CreateNewBlock(Params(), coinbaseScript->reserveScript));
         if (!pblocktemplate.get())
             throw JSONRPCError(RPC_INTERNAL_ERROR, "Couldn't create new block");
         CBlock *pblock = &pblocktemplate->block;