warnings: remove unused captures in lambdas

Found with clang's -Wunused-lambda-capture

Author: pboettch

http_examples.cpp

@@ -89,13 +89,13 @@ int main() {
 
     //GET-example for the path /match/[number], responds with the matched string in path (number)
     //For instance a request GET /match/123 will receive: 123
-    server.resource["^/match/([0-9]+)$"]["GET"]=[&server](shared_ptr<HttpServer::Response> response, shared_ptr<HttpServer::Request> request) {
+    server.resource["^/match/([0-9]+)$"]["GET"]=[](shared_ptr<HttpServer::Response> response, shared_ptr<HttpServer::Request> request) {
         string number=request->path_match[1];
         *response << "HTTP/1.1 200 OK\r\nContent-Length: " << number.length() << "\r\n\r\n" << number;
     };
 
     //Get example simulating heavy work in a separate thread
-    server.resource["^/work$"]["GET"]=[&server](shared_ptr<HttpServer::Response> response, shared_ptr<HttpServer::Request> /*request*/) {
+    server.resource["^/work$"]["GET"]=[](shared_ptr<HttpServer::Response> response, shared_ptr<HttpServer::Request> /*request*/) {
         thread work_thread([response] {
             this_thread::sleep_for(chrono::seconds(5));
             string message="Work done";

https_examples.cpp

@@ -87,13 +87,13 @@ int main() {
 
     //GET-example for the path /match/[number], responds with the matched string in path (number)
     //For instance a request GET /match/123 will receive: 123
-    server.resource["^/match/([0-9]+)$"]["GET"]=[&server](shared_ptr<HttpsServer::Response> response, shared_ptr<HttpsServer::Request> request) {
+    server.resource["^/match/([0-9]+)$"]["GET"]=[](shared_ptr<HttpsServer::Response> response, shared_ptr<HttpsServer::Request> request) {
         string number=request->path_match[1];
         *response << "HTTP/1.1 200 OK\r\nContent-Length: " << number.length() << "\r\n\r\n" << number;
     };
 
     //Get example simulating heavy work in a separate thread
-    server.resource["^/work$"]["GET"]=[&server](shared_ptr<HttpsServer::Response> response, shared_ptr<HttpsServer::Request> /*request*/) {
+    server.resource["^/work$"]["GET"]=[](shared_ptr<HttpsServer::Response> response, shared_ptr<HttpsServer::Request> /*request*/) {
         thread work_thread([response] {
             this_thread::sleep_for(chrono::seconds(5));
             string message="Work done";

server_http.hpp

@@ -217,7 +217,8 @@ namespace SimpleWeb {
 
         ///Use this function if you need to recursively send parts of a longer message
         void send(const std::shared_ptr<Response> &response, const std::function<void(const boost::system::error_code&)>& callback=nullptr) const {
-            boost::asio::async_write(*response->socket, response->streambuf, [this, response, callback](const boost::system::error_code& ec, size_t /*bytes_transferred*/) {
+            boost::asio::async_write(*response->socket, response->streambuf, [response, callback](const boost::system::error_code& ec, size_t /*bytes_transferred*/) {
+                (void) response; // response is not used here, but needs to captured to keep it alive because async_write is using response->*-fields
                 if(callback)
                     callback(ec);
             });

tests/io_test.cpp

@@ -28,7 +28,8 @@ int main() {
         *response <<  "HTTP/1.1 200 OK\r\nContent-Length: " << content_stream.tellp() << "\r\n\r\n" << content_stream.rdbuf();
     };
 
-    server.resource["^/match/([0-9]+)$"]["GET"]=[&server](shared_ptr<HttpServer::Response> response, shared_ptr<HttpServer::Request> request) {
+
+    server.resource["^/match/([0-9]+)$"]["GET"]=[](shared_ptr<HttpServer::Response> response, shared_ptr<HttpServer::Request> request) {
         string number=request->path_match[1];
         *response << "HTTP/1.1 200 OK\r\nContent-Length: " << number.length() << "\r\n\r\n" << number;
     };