// templateClassTemplate.cpp
#include <iostream>
class Account{
public:
  explicit Account(double amount=0.0): balance(amount){}
  void deposit(double amount){
    balance+= amount;
  }
  void withdraw(double amount){
    balance-= amount;
  }
  
  double getBalance() const{
    return balance;
  }
private:
  double balance;
};
template <typename T, int N>
class Array{
public:
  Array()= default;
  int getSize() const;
private:
  T elem[N];
};
template <typename T, int N>
int Array<T,N>::getSize() const {
  return N;
}
int main(){
  std::cout << std::endl;
  Array<double,10> doubleArray;
  std::cout << "doubleArray.getSize(): " << doubleArray.getSize() << std::endl;
  Array<Account,1000> accountArray;
  std::cout << "accountArray.getSize(): " << accountArray.getSize() << std::endl;
  std::cout << std::endl;
}

// templateClassTemplateMethods.cpp
#include <algorithm>
#include <iostream>
#include <vector>
template <typename T, int N>
class Array{
public:
  Array()= default;
  template <typename T2>
  Array<T, N>& operator=(const Array<T2, N>& arr){
    elem.clear();
	  elem.insert(elem.begin(), arr.elem.begin(), arr.elem.end());
	  return *this;
  }
  int getSize() const;
  std::vector<T> elem;
};
template <typename T, int N>
int Array<T, N>::getSize() const {
  return N;
}
int main(){
  Array<double, 10> doubleArray{};
  Array<int, 10> intArray{};
  doubleArray= intArray;
  Array<std::string, 10> strArray{};
  Array<int, 100> bigIntArray{};
  // doubleArray= strArray;            // ERROR: cannot convert ‘const std::basic_string<char>’ to ‘double’
  // doubleArray= bigIntArray;         // ERROR: no match for ‘operator=’ in ‘doubleArray = bigIntArray
  
}