cppFPointersBasic

#include <iostream>
#include <functional>

int* createArr(int size)
{
    return new int[size] {};
}

void deleteArr(int* ptr)
{
    delete[] ptr;
}

void printArr(const int* begin, const int* const end)
{
    while (begin != end)
    {
        std::cout << *begin++ << ' ';
    }
    std::cout << '\n';
}

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


void fillArr(int* begin, const int* const end, int val)
{
    while (begin != end)
    {
        *begin++ = val;
    }
}

void fillArr(int* begin, const int* const end)
{
    int val{ 1 };
    while (begin != end)
    {
        *begin++ = val++;
    }
}

void printMsg()
{
    std::cout << "Hello, world!\n";
}

void countDown()
{
    for (int i{ 5 }; i >= 0; --i)
    {
        std::cout << i << '\n';
    }
    std::cout << "Booom!\n";
}

int max(int a, int b)
{
    return a > b ? a : b;
}

int min(int a, int b)
{
    return a < b ? a : b;
}

float func(bool f, int n, char s);

bool sortUp(int a, int b) { return a < b; };
bool sortDown(int a, int b) { return a > b; };
bool sortEvenFirst(int a, int b) { return (a % 2 == 0) and (b % 2 != 0); }
bool sortOddFirst(int a, int b) { return (a % 2 != 0) and (b % 2 == 0); }
//void sort(int* arr, int arrSize, int sortCrit = 1)
//{
//  int tmp;
//  for (int head{ 0 }; head < arrSize; ++head)
//  {
//      for (int tail{ arrSize - 1 }; tail > head; --tail)
//      {
//          if (sortCrit == 1)
//          {
//              if (sortUp(arr[tail], arr[tail - 1]))
//              {
//                  tmp = arr[tail];
//                  arr[tail] = arr[tail - 1];
//                  arr[tail - 1] = tmp;
//              }
//          }
//          else if (sortCrit == 0)
//          {
//              if (sortDown(arr[tail], arr[tail - 1]))
//              {
//                  tmp = arr[tail];
//                  arr[tail] = arr[tail - 1];
//                  arr[tail - 1] = tmp;
//              }
//          }
//          else if (sortCrit == 3)
//          {
//              if (sortEvenFirst(arr[tail], arr[tail - 1]))
//              {
//                  tmp = arr[tail];
//                  arr[tail] = arr[tail - 1];
//                  arr[tail - 1] = tmp;
//              }
//          }
//          /*if (arr[tail] < arr[tail - 1])
//          {
//              tmp = arr[tail];
//              arr[tail] = arr[tail - 1];
//              arr[tail - 1] = tmp;
//          }*/
//      }
//  }
//}

void sort(int* arr, int arrSize, int sortCrit = 1)
{
    int tmp;
    for (int head{ 0 }; head < arrSize; ++head)
    {
        for (int tail{ arrSize - 1 }; tail > head; --tail)
        {
            if ((sortCrit == 1 and sortUp(arr[tail], arr[tail - 1])) or (sortCrit == 0 and sortDown(arr[tail], arr[tail - 1])) or (sortCrit == 3 and sortEvenFirst(arr[tail], arr[tail - 1])))
            {
                tmp = arr[tail];
                arr[tail] = arr[tail - 1];
                arr[tail - 1] = tmp;
            }
        }
    }
}

void sort(int* arr, int arrSize, std::function<bool(int,int)> sortCrit)
{
    int tmp;
    for (int head{ 0 }; head < arrSize; ++head)
    {
        for (int tail{ arrSize - 1 }; tail > head; --tail)
        {
            if (sortCrit(arr[tail], arr[tail - 1]))
            {
                tmp = arr[tail];
                arr[tail] = arr[tail - 1];
                arr[tail - 1] = tmp;
            }
        }
    }
}



void forEach(int* begin, const int* const end, std::function<void(int&)>action)
{
    while (begin != end)
    {
        //std::cout << *begin++ << ' ';
        action(*begin++);
    }
    std::cout << '\n';
}


void printHAction(int& elem)
{
    std::cout << elem << ' ';
}

void printVAction(int& elem)
{
    std::cout << elem << '\n';
}

void randomAction(int& elem)
{
    elem = rand() % 10;
}

int main()
{
    const int arrSize{ 10 };
    int arr[arrSize]{ 6,1,4,2,8,9,11,3,2,1 };

    forEach(arr, arr + arrSize, printHAction);
    //printArr(arr, arr + arrSize);
    //sort(arr, arrSize,0);
    sort(arr, arrSize, sortOddFirst);
    //printArr(arr, arr + arrSize);
    forEach(arr, arr + arrSize, printVAction);


    /*printMsg();
    std::cout << "Address of printMsg: " << printMsg << '\n';

    float(*funcPointer)(bool, int, char) {nullptr};

    void* vPtr{ printMsg };

    std::function<void()>vPtr();

    std::function<void()> newFPtr{ printMsg };
    std::function<int(int, int)> newFPtr1{ max };
    std::function<float(bool, int, char)> newFPtr2{ func };

    void* ptr{ min };
    auto funcPtr{ printMsg };

    void(*ptrF1)() {printMsg};
    int(*ptrF2)(int, int) { max };

    ptrF1();
    ptrF1 = countDown;

    if (ptrF1)
    {
        ptrF1();
    }
    else
    {
        std::cout << "Nobody lives here :(\n";
    }*/

}