lor-array-template.cpp

#include <cstddef>

#include <iostream>
#include <new>
#include <utility>

template <typename T>
class Array
{
public:
    explicit Array(size_t size = 0, const T& value = T())
        : size_(size),
          dat(reinterpret_cast<T*>(new char[sizeof(T[size])]))
    {
        for (size_t i = 0; i < size; ++i)
        {
            new (&dat[i]) T(value);
        }
    }

    Array(const Array & a)
    {
        size_=a.size();
        dat= new T [size_];
        for (size_t i = 0; i<size_; ++i)
            dat[i]= a.dat[i];
    }

    ~Array()
    {
        for (size_t i = 0; i<size_; ++i)
            dat[i].~T();
    }

    Array& operator=(const  Array  &  a )
    {
        Array copy(a);
        std::swap(*this, a);
        return *this;
    }

    size_t size() const
    {
        return size_;
    }

    T & operator[](size_t iter)
    {
        return dat[iter];
    }

    const T& operator[](size_t iter) const
    {
        return dat[iter];
    }

private:
    size_t size_;
    T *dat;
};

class Class
{
public:
    Class(int d) : d(d) {}

    operator int() const { return d; }

private:
    int d;
};

int
main()
{
    Class c = 1;
    Array<Class> a(10, c);
    std::cout << a[5] << std::endl;
}