7.9 함수포인터

#include <iostream>
#include <array>
#include <functional>

using namespace std;

bool isEven(const int& number){
    
    if (number%2==0) return true;
    else return false;
}

bool isOdd(const int& number){
    if (number%2==1) return true;
    else return false;
}

// typedef bool (*check_fcn_t)(const int&);

using check_fcn_t = bool(*)(const int&);

void printNumbers(const array<int, 10> &my_array, 
        std::function<bool(const int&)> fcnptr){
    for (auto element: my_array){
        if (fcnptr(element)) cout << element << " ";
    }
    cout << "\n";
}


int main(){

    std::array<int,10> my_array{0,1,2,3,4,5,6,7,8,9};

    std::function<bool(const int&)> fcnptr = isEven;


    printNumbers(my_array, fcnptr);

    fcnptr = isOdd;

    printNumbers(my_array, fcnptr);

    return 0;
}