include .cpp to .hpp in C++ template class

tempclass.cpp

#include <iostream>

template<class T>
TempClass<T>::TempClass(){
    std::cout << "new" << std::endl;
}

template<class T>
TempClass<T>::~TempClass(){
    std::cout << "delete" << std::endl;
}

template<class T>
void
TempClass<T>::input(T val){
    this->memory = val;
}

template<class T>
T
TempClass<T>::output(){
    return this->memory;
}

tempclass.hpp

#pragma once

template<class T>
class TempClass{

public:
    TempClass();
    ~TempClass();

    void input(T val);
    T output();

private:
    T memory;
};

#include "tempclass.cpp"

temptest.cpp

#include <iostream>
#include <string>

#include "tempclass.hpp"


int main(){
    TempClass<int> t_int;
    TempClass<std::string> t_string;

    t_int.input(12345);
    t_string.input("皆と同じようにiPodの手術を受けたい");

    std::cout << "int: " << t_int.output() << std::endl;
    std::cout << "string: " << t_string.output() << std::endl;

    return 0;
}