How to pass a object member function to ResourceNode constructor? 

**I need to register a node callback with a object member function**
I created a class to hold all my https request callbacks functions and I want to pass those functions to ResourceNode constructor and register in my server.

**Some of my files**


**https_handler.h**
```c++
#ifndef HTTPS_HANDLER_H
#define HTTPS_HANDLER_H
#include "Arduino.h"
#include <HTTPSServer.hpp>
#include "SSLCert.hpp"
#include <HTTPRequest.hpp>
#include <HTTPResponse.hpp>
using namespace httpsserver;
class HttpsHandler {
  public:
    HttpsHandler();
    ~HttpsHandler();
    void root(HTTPRequest * req, HTTPResponse * res);
  private:
};
#endif
```

**https_handler.cpp**
```c++
#include "https_handler.h"

void HttpsHandler::root(HTTPRequest * req, HTTPResponse * res) {
	// We want to deliver an HTML page, so we set the content type
	res->setHeader("Content-Type", "text/html");
	// The response implements the Print interface, so you can use it just like
	// you would write to Serial etc.
	res->println("<!DOCTYPE html>");
	res->println("<html>");
	res->println("<head><title>Hello World!</title></head>");
	res->println("<body>");
	res->println("<h1>Hello World!</h1>");
	res->print("<p>... from your ESP32!</p>");
	res->println("</body>");
	res->println("</html>");
}
```

**my_server.h**
```c++
#ifndef MY_SERVER_H
#define MY_SERVER_H

#include "../ssl_certificate/cert.h"
#include "../ssl_certificate/private_key.h"
#include "handlers/https_handler.h"
#include <HTTPSServer.hpp>
#include "SSLCert.hpp"
#include <HTTPRequest.hpp>
#include <HTTPResponse.hpp>

using namespace httpsserver;

class MyServer {
  public:
    MyServer();
    ~MyServer();
    void setup();
    void loop();
  private:
    SSLCert cert = SSLCert(
        example_crt_DER,     // DER-formatted certificate data
        example_crt_DER_len, // length of the certificate data
        example_key_DER,     // private key for that certificate
        example_key_DER_len  // Length of the private key
    );
    HTTPSServer secureServer = HTTPSServer(&cert);
    HttpsHandler *handler;
    void configureNodes();
};
#endif

```

**my_server.cpp**
```c++
#include "my_server.h"

MyServer::MyServer(/* args */) { }

MyServer::~MyServer() { }

void MyServer::setup() {
  Serial.println("MyServer::start");
  secureServer.start();
  configureNodes();
};

void MyServer::loop() {
  secureServer.loop();
}


void MyServer::configureNodes() {
  ResourceNode * nodeRoot = new ResourceNode("/", "GET", &HttpsHandler::root);
  secureServer.registerNode(nodeRoot);
}
```

**platformio.ini**

```c++
[env:development]
platform = espressif32@2.1.0
board = esp32doit-devkit-v1
framework = arduino
upload_speed = 115200
board_build.flash_mode = dio
build_flags =
  -DHTTPS_LOGLEVEL=2
  -DHTTPS_LOGTIMESTAMP
  -DHTTPS_DISABLE_SELFSIGNING
lib_deps =
  fhessel/esp32_https_server
```
**Here the error logs**


```c++
src/system/communication/protocols/HTTPS/my_server.cpp:23:77: error: no matching function for call to 'httpsserver::ResourceNode::ResourceNode(const char [2], const char [4], void (HttpsHandler::*)(httpsserver::HTTPRequest*, httpsserver::HTTPResponse*))'
   ResourceNode * nodeRoot = new ResourceNode("/", "GET", &HttpsHandler::root);
                                                                             ^
In file included from .pio/libdeps/esp01_1m/esp32_https_server/src/HTTPServer.hpp:20:0,
                 from .pio/libdeps/esp01_1m/esp32_https_server/src/HTTPSServer.hpp:15,
                 from src/system/communication/protocols/HTTPS/handlers/https_handler.h:4,
                 from src/system/communication/protocols/HTTPS/my_server.h:6,
                 from src/system/communication/protocols/HTTPS/my_server.cpp:1:
.pio/libdeps/esp01_1m/esp32_https_server/src/ResourceNode.hpp:18:3: note: candidate: httpsserver::ResourceNode::ResourceNode(const string&, const string&, void (*)(httpsserver::HTTPRequest*, httpsserver::HTTPResponse*), const string&)
   ResourceNode(const std::string &path, const std::string &method, const HTTPSCallbackFunction * callback, const std::string &tag = "");
   ^
.pio/libdeps/esp01_1m/esp32_https_server/src/ResourceNode.hpp:18:3: note:   no known conversion for argument 3 from 'void (HttpsHandler::*)(httpsserver::HTTPRequest*, httpsserver::HTTPResponse*)' to 'void (*)(httpsserver::HTTPRequest*, httpsserver::HTTPResponse*)'
.pio/libdeps/esp01_1m/esp32_https_server/src/ResourceNode.hpp:16:7: note: candidate: httpsserver::ResourceNode::ResourceNode(const httpsserver::ResourceNode&)
 class ResourceNode : public HTTPNode {
       ^
.pio/libdeps/esp01_1m/esp32_https_server/src/ResourceNode.hpp:16:7: note:   candidate expects 1 argument, 3 provided
*** [.pio/build/esp01_1m/src/system/communication/protocols/HTTPS/my_server.cpp.o] Error 1

```
Is it possible to do what I am proposing? how?
I'm a beginner in CPP

thanks in advance


**ESP32-D0WDQ6 (revision 1)**
- Flash Size: 4MB

**Tools**
 - IDE and Version: vscode 1.51.1
 - OS: Ubuntu 18.04.4 LTS



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How to pass a object member function to ResourceNode constructor? #105

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