cppDynArrFunctions

#include <iostream>

template <typename T>
T* createArr(int size)
{
    return new T[size];
}

template <typename T>
void deleteArr(T* ptr)
{
    delete[] ptr;
}

template <typename T>
void printArr(const T* begin, const T* const end)
{
    while (begin != end)
    {
        std::cout << *begin++ << ' ';
    }
    std::cout << '\n';
}

template <typename T>
void fillArr(T* begin, const T* const end, int start, int stop)
{
    while (begin != end)
    {
        *begin++ = (rand() % (stop - start) + start);
    }
}

template <typename T>
void fillArr(T* begin, const T* const end, T val, bool incremental = false)
{
    while (begin != end)
    {
        *begin++ = val;
        val += incremental;
    }

}

template <typename T>
void addElementTo(T*& begin, int& size, int idx, T val = 0)
{
    T* newArr{ new T[size + 1] };

    for (int copyPos{0}; copyPos < size; ++copyPos)
    {
        *(newArr + copyPos + (copyPos >= idx)) = *(begin + copyPos);
    }

    *(newArr + idx) = val;

    delete[] begin;
    begin = newArr;
    ++size;
}

template <typename T>
void addElementToEnd(T*& begin, int& size, T val = 0)
{
    addElementTo(begin, size, size, val);
}

template <typename T>
void deleteElementFrom(T*& begin, int& size, int idx)
{
    T* newArr{ new T[--size] };

    for (int copyPos{ 0 }; copyPos < size; ++copyPos)
    {
        *(newArr + copyPos) = *(begin + copyPos + (copyPos >= idx));
    }

    delete[] begin;
    begin = newArr;
}

template <typename T>
void deleteElementFromEnd(T*& begin, int& size)
{
    deleteElementFrom(begin, size, size);
}

int main()
{
    int arr1Size{ 10 };
    auto arr1{ createArr<int>(arr1Size) };

    fillArr(arr1, arr1 + arr1Size, 0, true);
    printArr(arr1, arr1 + arr1Size);

    addElementTo(arr1, arr1Size, arr1Size / 2, 33);
    printArr(arr1, arr1 + arr1Size);

    deleteElementFrom(arr1, arr1Size, arr1Size / 2);
    printArr(arr1, arr1 + arr1Size);

    addElementToEnd(arr1, arr1Size, 42);
    printArr(arr1, arr1 + arr1Size);

    deleteElementFromEnd(arr1, arr1Size);
    printArr(arr1, arr1 + arr1Size);

    deleteArr(arr1);
}