sec-20-video-242-template-class

gistfile1.txt

template <int N>
class Array {
    int size {N};
    int values {N};
    
    friend std::ostream &operator<<(std::ostream &os, const Array &arr) {
        os << "[";
        for (const auto &val: arr.values) {
            os << val << " ";
        }
        os << "]";
        os << std::endl;
        return os;
    }
    
public:
    Array() = default;
    Array(int init_val) {
        for (auto &item: values) {
            item = init_val;
        }
    }
    void fill(int val) {
        for (auto &item: values) {
            item = val;
        }
    }
    
    int get_size() const {return size;}
    
    int &operator[](int index) {
        return values[index];
    }
};


// Error -> 
// error: invalid range expression of type 'int'; no viable 'begin' function available
//   85 |         for (auto &item: values) {


//error: invalid range expression of type 'const int'; no viable 'begin' function available
//   69 |         for (const auto &val: arr.values) {
//      |                             ^ ~~~