I have created a class like this:
#ifndef MyList_h
#define MyList_h
#include "Arduino.h"
template <typename T>
class MyList {
public:
MyList(void);
~MyList(void);
void addItem(T* item);
//more stuff
};
#endif
And implementation is like this:
#include "Arduino.h"
#include "MyList.h"
template<typename T> MyList<T>::MyList(void) {
// constructor implementation here
}
template<typename T> MyList<T>::~MyList(void) {
// desctructor implementation here
}
template<typename T> void MyList<T>::addItem(T* item) {
// function implementation here
}
// ...more stuff
In my .ino Sketch I'm doing this (found this solution in a C++ example):
#include "MyList.h"
MyList<word>* list = new MyList<word>(); // global scope
//... more stuff
But when compiling, Arduino IDE complains:
Test.ino:5: undefined reference to `MyList::MyList()'
I googled a bit and found this alternative way for creating the instance:
ArrayList<word>* list;
Then there's no error, just compiles file. BUT as soon as I want to use this instance (=adding code) like this:
list->addItem(i);
compiler complains again:
Test.ino:25: undefined reference to `MyList::addItem(unsigned int*)'
What's wrong? Why is this reference undefined?
I tried another way:
ArrayList<word> list; // again global scope
But then the compiler also tells me:
Test.ino:5: undefined reference to
MyList<unsigned int>::MyList()' /tmp/ccp8qmCz.ltrans0.ltrans.o: In function_GLOBAL__sub_D_list': /....../Test.ino:5: undefined reference to `MyList::~MyList()'
So, how can I create an instance of my class that uses a template?
Environment: Arduino IDE 1.8.3 (I know, I could update...) + Arduino Nano Board.
