[1470] Remove "this" from initializer lists

Some compilers warn if "this" is referred to in a constructor
initialization list.  This change replaces such initializations
with an assignment within the constructor body.

src/bin/auth/auth_srv.cc

@@ -228,12 +228,13 @@ private:
     AuthSrv* server_;
 };
 
-AuthSrv::AuthSrv(const bool use_cache, AbstractXfroutClient& xfrout_client) :
-    impl_(new AuthSrvImpl(use_cache, xfrout_client)),
-    checkin_(new ConfigChecker(this)),
-    dns_lookup_(new MessageLookup(this)),
-    dns_answer_(new MessageAnswer(this))
-{}
+AuthSrv::AuthSrv(const bool use_cache, AbstractXfroutClient& xfrout_client)
+{
+    impl_ = new AuthSrvImpl(use_cache, xfrout_client);
+    checkin_ = new ConfigChecker(this);
+    dns_lookup_ = new MessageLookup(this);
+    dns_answer_ = new MessageAnswer(this);
+}
 
 void
 AuthSrv::stop() {

src/bin/resolver/resolver.cc

@@ -354,13 +354,19 @@ private:
 Resolver::Resolver() :
     impl_(new ResolverImpl()),
     dnss_(NULL),
-    checkin_(new ConfigCheck(this)),
-    dns_lookup_(new MessageLookup(this)),
+    checkin_(NULL),
+    dns_lookup_(NULL),
     dns_answer_(new MessageAnswer),
     nsas_(NULL),
     cache_(NULL),
     configured_(false)
-{}
+{
+    // Operations referring to "this" must be done in the constructor body
+    // (some compilers will issue warnings if "this" is referred to in the
+    // initialization list).
+    checkin_ = new ConfigCheck(this);
+    dns_lookup_ = new MessageLookup(this);
+}
 
 Resolver::~Resolver() {
     delete impl_;

src/lib/asiodns/dns_lookup.h

@@ -51,7 +51,9 @@ protected:
     ///
     /// This is intentionally defined as \c protected as this base class
     /// should never be instantiated (except as part of a derived class).
-    DNSLookup() : self_(this) {}
+    DNSLookup() {
+        self_ = this;
+    }
 public:
     /// \brief The destructor
     virtual ~DNSLookup() {}

src/lib/asiodns/dns_server.h

@@ -53,7 +53,9 @@ protected:
     /// This is intentionally defined as \c protected, as this base class
     /// should never be instantiated except as part of a derived class.
     //@{
-    DNSServer() : self_(this) {}
+    DNSServer() {
+        self_ = this;
+    }
 public:
     /// \brief The destructor
     virtual ~DNSServer() {}

src/lib/asiolink/simple_callback.h

@@ -49,7 +49,9 @@ protected:
     ///
     /// This is intentionally defined as \c protected as this base class
     /// should never be instantiated (except as part of a derived class).
-    SimpleCallback() : self_(this) {}
+    SimpleCallback() {
+        self_ = this;
+    }
 public:
     /// \brief The destructor
     virtual ~SimpleCallback() {}

src/lib/datasrc/rbtree.h

@@ -295,15 +295,20 @@ private:
 // This is only to support NULL nodes.
 template <typename T>
 RBNode<T>::RBNode() :
-    parent_(this),
-    left_(this),
-    right_(this),
+    parent_(NULL),
+    left_(NULL),
+    right_(NULL),
     color_(BLACK),
     // dummy name, the value doesn't matter:
     name_(isc::dns::Name::ROOT_NAME()),
-    down_(this),
+    down_(NULL),
     flags_(0)
 {
+    // Some compilers object to use of "this" in initializer lists.
+    parent_ = this;
+    left_ = this;
+    right_ = this;
+    down_ = this;
 }
 
 template <typename T>

src/lib/resolve/recursive_query.cc

@@ -676,11 +676,14 @@ public:
         nsas_(nsas),
         cache_(cache),
         cur_zone_("."),
-        nsas_callback_(new ResolverNSASCallback(this)),
+        nsas_callback_(),
         nsas_callback_out_(false),
         outstanding_events_(0),
         rtt_recorder_(recorder)
     {
+        // Set here to avoid using "this" in initializer list.
+        nsas_callback_.reset(new ResolverNSASCallback(this));
+
         // Setup the timer to stop trying (lookup_timeout)
         if (lookup_timeout >= 0) {
             lookup_timer.expires_from_now(