const int size = array_size + 1;
T* inside_array = new T[size];
for (int i = 0; i < array_size; i++)
    inside_array[i] = (*array)[i];
inside_array[array_size] = buffer;
if (array_size >= 100)
{
    throw 1;
}

int array_size;
cout << "Размер массива: ";
cin >> array_size;
int* array = new int[array_size];
for (int i = 0; i < array_size; i++)
{
    array[i] = i + 1;
    cout << array[i] << " ";
}
int buffer;
cout << "nДобавить элемент: ";
cin >> buffer;
try
{
    push_back(&array, buffer, array_size);
}
catch (int e)
{
    cout << "ошибка №: " << e << endl;
}
for (int i = 0; i < array_size + 1; i++)
{
    cout << array[i] << " ";
}
return 0;