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EDIT: I resolved the issue up there (it was due to the misplaced comment), but a new issue has popped up saying that it expected an initialiser before the '<' token at the places where I had defined the functions in the derived class. This is where my actual is.

Edit: I resolved the issue up there (it was due to the misplaced comment), but a new issue has popped up saying that it expected an initialiser before the '<' token at the places where I had defined the functions in the derived class. This is where my actual is.

Edit I decided to move forward despite errors. Here's how I remade my header file:

#ifndef Devices_h
#define Devices_h

/* Initial build for MCUOS 
Anybody can edit this according to their device needs */ 

#include "Arduino.h"

template < typename datatype>
class Device_Handler 
{
               // a class to handle devices
    public:
        virtual void write_to_device(datatype *send_data)= 0; // write data to device
        virtual void read_from_device(datatype *store_location)= 0 ; // read data from device to location
        virtual void clear_device() = 0; // clear device state
};

class Serial_Handler:public Device_Handler<char*>
{
   public:
          void write_to_device(char *send_data);
          void read_from_device(char *store_location);
          void clear_device();
};


void Serial_Handler::write_to_device(char *send_data){
        Serial.println(*send_data);
 }

void Serial_Handler::read_from_device(char *store_location){
       *store_location = Serial.read();
}

void  Serial_Handler::clear_device(){
        Serial.flush(); 
}


#endif

Here's the sketch code:

#include <Devices.h>

Serial_Handler myserial;
char storage = '\0';
char test_string[] = "Hello";

void setup() {
  Serial.begin(9600);
  myserial.write_to_device(test_string);
  myserial.read_from_device(&storage);
}

void loop() {
  // put your main code here, to run repeatedly:

}

(I know that the code up there may also be faulty) and errors come up:

Arduino: 1.8.13 (Windows 10), Board: "Arduino Uno"
Devices_Test:3:16: error: cannot declare variable 'myserial' to be of abstract type 'Serial_Handler'

 Serial_Handler myserial;

                ^~~~~~~~

In file included from C:\Users\<smbdy>\Documents\Arduino\Devices_Test\Devices_Test.ino:1:0:

C:\Users\<smbdy>\Documents\Arduino\libraries\Devices/Devices.h:19:7: note:   because the following virtual functions are pure within 'Serial_Handler':

 class Serial_Handler:public Device_Handler<char*>

       ^~~~~~~~~~~~~~

C:\Users\<smbdy>\Documents\Arduino\libraries\Devices/Devices.h:14:16: note:     void Device_Handler<datatype>::write_to_device(datatype*) [with datatype = char*]

   virtual void write_to_device(datatype *send_data)= 0; // write data to device

                ^~~~~~~~~~~~~~~

C:\Users\<smbdy>\Documents\Arduino\libraries\Devices/Devices.h:15:16: note:     void Device_Handler<datatype>::read_from_device(datatype*) [with datatype = char*]

   virtual void read_from_device(datatype *store_location)= 0 ; // read data from device to location

                ^~~~~~~~~~~~~~~~

exit status 1

cannot declare variable 'myserial' to be of abstract type 'Serial_Handler'

How should I resolve this?

#ifndef Devices_h
#define Devices_h

/* Initial build for MCUOS 
Anybody can edit this according to their device needs */ 

#include "Arduino.h"

template < typename datatype>

class Device_Handler 
{
    // a class to handle devices
    public:
        virtual void write_to_device(datatype *send_data)= 0; // write data to device
        virtual void read_from_device(datatype *store_location)= 0 ; // read data from device to location
        virtual void clear_device() = 0; // clear device state
};

class Serial_Handler:public Device_Handler<char>
{
   public:
          void write_to_device(char *send_data);
          void read_from_device(char *store_location);
          void clear_device();
};


void Serial_Handler<char>::write_to_device(char *send_data){
        Serial.println(*send_data);
 }

void read_from_device(char *store_location){
       *store_location = Serial.read();
}

void clear_device(){
        Serial.flush(); 
}


#endif

EDIT: I resolved the issue up there (it was due to the misplaced comment), but a new issue has popped up saying that it expected an initialiser before the '<' token at the places where I had defined the functions in the derived class.

#ifndef Devices_h
#define Devices_h

/* Initial build for MCUOS 
Anybody can edit this according to their device needs */ 

#include "Arduino.h"

template < typename datatype>

class Device_Handler 
{
    // a class to handle devices
    public:
        virtual void write_to_device(datatype *send_data)= 0; // write data to device
        virtual void read_from_device(datatype *store_location)= 0 ; // read data from device to location
        virtual void clear_device() = 0; // clear device state
};

class Serial_Handler:public Device_Handler<char*>
{
   public:
          void write_to_device(char *send_data);
          void read_from_device(char *store_location);
          void clear_device();
};


void Serial_Handler<char*>::write_to_device(char *send_data){
        Serial.println(*send_data);
 }

void Serial_Handler<char*>::read_from_device(char *store_location){
       *store_location = Serial.read();
}

void Serial_Handler::clear_device(){
        Serial.flush(); 
}


#endif

EDIT: I resolved the issue up there (it was due to the misplaced comment), but a new issue has popped up saying that it expected an initialiser before the '<' token at the places where I had defined the functions in the derived class. This is where my actual is.

My snippets of main concern:

void Serial_Handler<char>::write_to_device(char *send_data){
        Serial.println(*send_data);
 }

void Serial_Handler<char*>::read_from_device(char *store_location){
       *store_location = Serial.read();
}

I doubt if these will be able to handle long sentences or have syntax errors.