Added move set_body for preformance

Author: MatusKysel

examples/telemetry_server/telemetry_server.cpp

@@ -149,7 +149,7 @@ class telemetry_server {
         response.assign((std::istreambuf_iterator<char>(file)),
                         std::istreambuf_iterator<char>());
 
-        con->set_body(response);
+        con->set_body(std::move(response));
         con->set_status(websocketpp::http::status_code::ok);
     }
 

test/connection/connection.cpp

@@ -175,6 +175,20 @@ void http_func(server* s, websocketpp::connection_hdl hdl) {
     BOOST_CHECK_EQUAL(con->get_response_msg(), status_code::get_string(status_code::ok));
 }
 
+void http_func_with_move(server* s, websocketpp::connection_hdl hdl) {
+    using namespace websocketpp::http;
+
+    server::connection_ptr con = s->get_con_from_hdl(hdl);
+
+    std::string res = con->get_resource();
+
+    con->set_body(std::move(res));
+    con->set_status(status_code::ok);
+
+    BOOST_CHECK_EQUAL(con->get_response_code(), status_code::ok);
+    BOOST_CHECK_EQUAL(con->get_response_msg(), status_code::get_string(status_code::ok));
+}
+
 void defer_http_func(server* s, bool * deferred, websocketpp::connection_hdl hdl) {
     *deferred = true;
 
@@ -240,6 +254,18 @@ BOOST_AUTO_TEST_CASE( http_request ) {
     BOOST_CHECK_EQUAL(run_server_test(s,input), output);
 }
 
+BOOST_AUTO_TEST_CASE( http_request_with_move ) {
+    std::string input = "GET /foo/bar HTTP/1.1\r\nHost: www.example.com\r\nOrigin: http://www.example.com\r\n\r\n";
+    std::string output = "HTTP/1.1 200 OK\r\nContent-Length: 8\r\nServer: ";
+    output+=websocketpp::user_agent;
+    output+="\r\n\r\n/foo/bar";
+
+    server s;
+    s.set_http_handler(bind(&http_func_with_move,&s,::_1));
+
+    BOOST_CHECK_EQUAL(run_server_test(s,input), output);
+}
+
 BOOST_AUTO_TEST_CASE( deferred_http_request ) {
     std::string input = "GET /foo/bar HTTP/1.1\r\nHost: www.example.com\r\nOrigin: http://www.example.com\r\n\r\n";
     std::string output = "HTTP/1.1 200 OK\r\nContent-Length: 8\r\nServer: ";

websocketpp/connection.hpp

@@ -1041,6 +1041,7 @@ class connection
      * @see websocketpp::http::response::set_body
      */
     void set_body(std::string const & value);
+    void set_body( std::string&& value );
 
     /// Append a header
     /**

websocketpp/impl/connection_impl.hpp

@@ -575,6 +575,16 @@ void connection<config>::set_body(std::string const & value) {
     m_response.set_body(value);
 }
 
+template <typename config>
+void connection<config>::set_body( std::string&& value ) {
+    if (m_internal_state != istate::PROCESS_HTTP_REQUEST) {
+        throw exception("Call to set_status from invalid state",
+                        error::make_error_code(error::invalid_state));
+    }
+
+    m_response.set_body(std::move(value));
+}
+
 // TODO: EXCEPTION_FREE
 template <typename config>
 void connection<config>::append_header(std::string const & key,