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#include <iostream>
template <class T>
class DynamicArray {
T *values;
int lastUnused;
int allocated;
void free();
void copyFrom(const DynamicArray<T>& other);
void resize();
public:
DynamicArray();
~DynamicArray();
DynamicArray(const DynamicArray<T>& other);
DynamicArray<T>& operator=(const DynamicArray<T>& other);
DynamicArray(DynamicArray<T>&& other);
DynamicArray<T>& operator=(DynamicArray<T>&& other);
void Add(const T& newValue);
// Тези оператори променят аргумента си, затова е по-добре да са член-функции
DynamicArray<T>& operator+=(const DynamicArray<T>& other);
DynamicArray<T>& operator+=(const T& newValue);
// По дефиниция не може operator=, operator(), operator[] и operator-> да бъдат имплементирани
// като приятелски функции
T& operator[](int index);
// Тези оператори не променят аргументите си, затова е по-добре да са приятелски
template <class U>
friend DynamicArray<U> operator+(const DynamicArray<U>& left, const DynamicArray<U>& right);
template <class U>
friend DynamicArray<U> operator+(const DynamicArray<U>& left, const U& right);
template <class U>
friend bool operator==(const DynamicArray<U>& left, const DynamicArray<U>& right);
template <class U>
friend bool operator!=(const DynamicArray<U>& left, const DynamicArray<U>& right);
template <class U>
friend std::ostream& operator<<(std::ostream& ostr, const DynamicArray<U>& right);
template <class U>
friend std::istream& operator>>(std::istream& ostr, DynamicArray<U>& right);
};
template <class T>
void DynamicArray<T>::free() {
delete[] values;
}
template <class T>
void DynamicArray<T>::copyFrom(const DynamicArray<T>& other) {
this->lastUnused = other.lastUnused;
this->allocated = other.allocated;
this->values = new T[allocated];
for (int i = 0; i < this->lastUnused; i++) {
this->values[i] = other.values[i];
}
}
template <class T>
void DynamicArray<T>::resize() {
allocated *= 2;
T* moreValues = new T[allocated];
for (int i = 0; i < lastUnused; i++) {
moreValues[i] = values[i];
}
delete[] values;
values = moreValues;
}
template <class T>
DynamicArray<T>::DynamicArray() {
values = nullptr;
lastUnused = allocated = 0;
}
template <class T>
DynamicArray<T>::~DynamicArray() {
free();
}
template <class T>
DynamicArray<T>::DynamicArray(const DynamicArray<T>& other) {
copyFrom(other);
}
template <class T>
DynamicArray<T>& DynamicArray<T>::operator=(const DynamicArray<T>& other) {
if (this != &other) {
free();
copyFrom(other);
}
return *this;
}
template <class T>
DynamicArray<T>::DynamicArray(DynamicArray<T>&& other) {
this->values = other.values;
other.values = nullptr;
this->lastUnused = other.lastUnused;
this->allocated = other.allocated;
}
template <class T>
DynamicArray<T>& DynamicArray<T>::operator=(DynamicArray<T>&& other) {
if (this != &other) {
free();
this->values = other.values;
other.values = nullptr;
this->lastUnused = other.lastUnused;
this->allocated = other.allocated;
}
return *this;
}
template <class T>
void DynamicArray<T>::Add(const T& number) {
if (allocated == lastUnused) {
resize();
}
values[lastUnused++] = number;
}
template <class T>
DynamicArray<T>& DynamicArray<T>::operator+=(const DynamicArray<T>& other) {
for (int i = 0; i < other.lastUnused; i++) {
this->Add(other.values[i]);
}
return *this;
}
template <class T>
DynamicArray<T>& DynamicArray<T>::operator+=(const T& number) {
for (int i = 0; i < lastUnused; i++) {
values[i] += number;
}
return *this;
}
template <class T>
T& DynamicArray<T>::operator[](int index) {
if (index < 0 || lastUnused <= index) {
throw "Invalid index!";
}
return values[index];
}
template <class T>
DynamicArray<T> operator+(const DynamicArray<T>& left, const DynamicArray<T>& right) {
DynamicArray<T> output;
(output += left) += right;
return output;
}
template <class T>
DynamicArray<T> operator+(const DynamicArray<T>& left, T right) {
DynamicArray<T> output = left; // Копиращ конструктор
output += right;
return output;
}
template <class T>
bool operator==(const DynamicArray<T>& left, const DynamicArray<T>& right) {
if (left.lastUnused != right.lastUnused) {
return false;
}
for (int i = 0; i < left.lastUnused; i++) {
if (left.values[i] != right.values[i]) {
return false;
}
}
return true;
}
template <class T>
bool operator!=(const DynamicArray<T>& left, const DynamicArray<T>& right) {
return !(left == right);
}
template <class T>
std::ostream& operator<<(std::ostream& ostr, const DynamicArray<T>& right) {
for (int i = 0; i < right.lastUnused; i++) {
ostr << right.values[i] << " ";
}
return ostr;
}
template <class T>
std::istream& operator>>(std::istream& istr, DynamicArray<T>& right) {
int length;
istr >> length;
right.lastUnused = 0;
for (int i = 0; i < length; i++) {
T temp;
istr >> temp;
right.Add(temp);
}
return istr;
}
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