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C++:algorithm

max_element

엘리먼트 목록중 최대 값을 찾아낸다. 

#include <algorithm>
#include <iostream>
#include <vector>
#include <cmath>

static bool abs_compare(int a, int b)
{
    return (std::abs(a) < std::abs(b));
}

int main()
{
    std::vector<int> v{ 3, 1, -14, 1, 5, 9 }; 
    std::vector<int>::iterator result;

    result = std::max_element(v.begin(), v.end());
    std::cout << "max element at: " << std::distance(v.begin(), result) << '\n';

    result = std::max_element(v.begin(), v.end(), abs_compare);
    std::cout << "max element (absolute) at: " << std::distance(v.begin(), result);
}

Output: 

max element at: 5
max element (absolute) at: 2

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