Remove unused strands in server examples

example/http/server/async-ssl/http_server_async_ssl.cpp

@@ -379,7 +379,6 @@ public:
 class listener : public std::enable_shared_from_this<listener>
 {
     ssl::context& ctx_;
-    boost::asio::io_service::strand strand_;
     tcp::acceptor acceptor_;
     tcp::socket socket_;
     std::string const& doc_root_;
@@ -391,7 +390,6 @@ public:
         tcp::endpoint endpoint,
         std::string const& doc_root)
         : ctx_(ctx)
-        , strand_(ios)
         , acceptor_(ios)
         , socket_(ios)
         , doc_root_(doc_root)

example/http/server/async/http_server_async.cpp

@@ -346,7 +346,6 @@ public:
 // Accepts incoming connections and launches the sessions
 class listener : public std::enable_shared_from_this<listener>
 {
-    boost::asio::io_service::strand strand_;
     tcp::acceptor acceptor_;
     tcp::socket socket_;
     std::string const& doc_root_;
@@ -356,8 +355,7 @@ public:
         boost::asio::io_service& ios,
         tcp::endpoint endpoint,
         std::string const& doc_root)
-        : strand_(ios)
-        , acceptor_(ios)
+        : acceptor_(ios)
         , socket_(ios)
         , doc_root_(doc_root)
     {

example/http/server/stackless-ssl/http_server_stackless_ssl.cpp

@@ -362,7 +362,6 @@ class listener
     , public std::enable_shared_from_this<listener>
 {
     ssl::context& ctx_;
-    boost::asio::io_service::strand strand_;
     tcp::acceptor acceptor_;
     tcp::socket socket_;
     std::string const& doc_root_;
@@ -374,7 +373,6 @@ public:
         tcp::endpoint endpoint,
         std::string const& doc_root)
         : ctx_(ctx)
-        , strand_(ios)
         , acceptor_(ios)
         , socket_(ios)
         , doc_root_(doc_root)

example/http/server/stackless/http_server_stackless.cpp

@@ -337,7 +337,6 @@ class listener
     : public boost::asio::coroutine
     , public std::enable_shared_from_this<listener>
 {
-    boost::asio::io_service::strand strand_;
     tcp::acceptor acceptor_;
     tcp::socket socket_;
     std::string const& doc_root_;
@@ -347,8 +346,7 @@ public:
         boost::asio::io_service& ios,
         tcp::endpoint endpoint,
         std::string const& doc_root)
-        : strand_(ios)
-        , acceptor_(ios)
+        : acceptor_(ios)
         , socket_(ios)
         , doc_root_(doc_root)
     {