CUDA: ptxas fatal : Unresolved extern function '_ZN15Rel_CoordinatesIdE9calculateERK11CoordinatesIdES4_'

Question

I am trying to calculate relative distance between points with user defined classes in CUDA. I have a Coordinates class and a Relative Coordinate class to store coordinates and calculate Relative Coodinates.

// class.cuh

#pragma once

#ifdef __CUDACC__
#include <cuda_runtime.h>
#define CUDA_HOST __host__ 
#define CUDA_DEVICE __device__
#else
#define CUDA_HOST 
#define CUDA_DEVICE 
#endif 

#define _USE_MATH_DEFINES
#include <math.h>

template <class Typ>
class Coordinates {
    public:
    Typ x{}, y{}, z{};

    Coordinates () = default;
    Coordinates (const Typ&, const Typ&, const Typ&);
};

template <class Typ>
class Rel_Coordinates : public Coordinates<Typ> {
    public:
    // unsigned idx_a{}, idx_b{};
    Typ dist2{}, dist{}, dist_inv{};

    Rel_Coordinates () = default;

    CUDA_HOST CUDA_DEVICE 
    void calculate (const Coordinates<Typ>&, const Coordinates<Typ>&);
};

template <class Typ>
Coordinates<Typ>::Coordinates(const Typ& X, const Typ& Y, const Typ& Z)
: x{X}, y{Y}, z{Z}
{}

template <class Typ>
__host__ __device__
void Rel_Coordinates<Typ>::calculate (
    const Coordinates<Typ>& element_A, 
    const Coordinates<Typ>& element_B
){
    this -> x = element_B.x - element_A.x;
    this -> y = element_B.y - element_A.y;
    this -> z = element_B.z - element_A.z;

    this -> dist2 = 0.;
    this -> dist2 += std::pow(this -> x, 2);
    this -> dist2 += std::pow(this -> y, 2);
    this -> dist2 += std::pow(this -> z, 2);

    this -> dist = std::sqrt(this -> dist2);

    this -> dist_inv = 1 / this -> dist;
}

// main.cu
#include "class.cuh"

__device__ Coordinates<double> a {}, b {};
__device__ Rel_Coordinates<double> ba {};

__global__ void cal (
    Coordinates<double> & a,
    Coordinates<double> & b,
    Rel_Coordinates<double> & ba
){
    a.x = 0.;
    a.y = 0.;
    a.z = 0.;
    b.x = 0.;
    b.y = 3.;
    b.z = 4.;

    ba.calculate (a, b);
}

int main () {

    cal <<<1,1>>> (a, b, ba);

}

and i am compiling it using:

nvcc main.cu class.cu -o main

I am runing this on Win11 with RTX 3070 mobile GPU.

I was expecing it to calculate relative position and distance. But i got this error:

main.cu
ptxas fatal   : Unresolved extern function '_ZN15Rel_CoordinatesIdE9calculateERK11CoordinatesIdES4_'