libnghttp2_asio: Optimized remote endpoint interface to const ref where possible

src/asio_server_http2_handler.cc

@@ -453,7 +453,9 @@ response *http2_handler::push_promise(boost::system::error_code &ec,
 
 boost::asio::io_service &http2_handler::io_service() { return io_service_; }
 
-boost::asio::ip::tcp::endpoint http2_handler::remote_endpoint() { return remote_ep_; }
+const boost::asio::ip::tcp::endpoint &http2_handler::remote_endpoint() {
+  return remote_ep_;
+}
 
 callback_guard::callback_guard(http2_handler &h) : handler(h) {
   handler.enter_callback();

src/asio_server_http2_handler.h

@@ -90,7 +90,7 @@ public:
 
   boost::asio::io_service &io_service();
 
-  boost::asio::ip::tcp::endpoint remote_endpoint();
+  const boost::asio::ip::tcp::endpoint &remote_endpoint();
 
   const std::string &http_date();
 

src/asio_server_request.cc

@@ -50,7 +50,7 @@ void request::on_data(data_cb cb) const {
 
 request_impl &request::impl() const { return *impl_; }
 
-boost::asio::ip::tcp::endpoint request::remote_endpoint() const {
+const boost::asio::ip::tcp::endpoint &request::remote_endpoint() const {
   return impl_->remote_endpoint();
 }
 

src/asio_server_request_impl.cc

@@ -54,7 +54,7 @@ void request_impl::call_on_data(const uint8_t *data, std::size_t len) {
   }
 }
 
-boost::asio::ip::tcp::endpoint request_impl::remote_endpoint() const {
+const boost::asio::ip::tcp::endpoint &request_impl::remote_endpoint() const {
   return remote_ep_;
 }
 

src/asio_server_request_impl.h

@@ -55,7 +55,7 @@ public:
   void stream(class stream *s);
   void call_on_data(const uint8_t *data, std::size_t len);
 
-  boost::asio::ip::tcp::endpoint remote_endpoint() const;
+  const boost::asio::ip::tcp::endpoint &remote_endpoint() const;
   void remote_endpoint(boost::asio::ip::tcp::endpoint ep);
 
 private:

src/includes/nghttp2/asio_http2_server.h

@@ -60,7 +60,7 @@ public:
   request_impl &impl() const;
 
   // Returns the remote endpoint of the request
-  boost::asio::ip::tcp::endpoint remote_endpoint() const;
+  const boost::asio::ip::tcp::endpoint &remote_endpoint() const;
 
 private:
   std::unique_ptr<request_impl> impl_;