how to use custom array in c++
template<typename T>
class array
{
public:
typedef T* iterator;
typedef const T* const_iterator;
private:
iterator head;
unsigned long elems;
public:
array()
: head(nullptr)
, elems(0) {}
array(const unsigned long &size)
: head(size > 0 ? new T[size] : nullptr)
, elems(size) {}
array(const T[]);
array(const array&);
~array() { delete[] head; }
iterator begin() const { return head; }
iterator end() const { return head != nullptr ? &head[elems] : nullptr; }
unsigned long size() const { return elems; }
array& operator=(const array&);
T& operator()(const unsigned long&);
};
template<typename T>
array<T>::array(const T rhs[])
{
unsigned long size = sizeof(rhs) / sizeof(T);
head = new T[size];
iterator pointer = begin();
for (const_iterator i = &rhs[0]; i != &rhs[0] + size; i++)
*pointer++ = *i;
}
template<typename T>
array<T>::array(const array<T> &rhs)
{
head = new T[rhs.size()];
iterator pointer = begin();
for (const_iterator i = rhs.begin(); i != rhs.end(); i++)
*pointer++ = *i;
}
template<typename T>
array<T>& array<T>::operator=(const array<T> &rhs)
{
if (this != &rhs)
{
delete[] head;
head = new T[rhs.size()];
iterator pointer = begin();
for (const_iterator i = rhs.begin(); i != rhs.end(); i++)
*pointer++ = *i;
}
return *this;
}
template<typename T>
T& array<T>::operator()(const unsigned long &index)
{
if (index < 1 || index > size())
{
// Add some error-handling here.
}
return head[index - 1];
}