learnmoderncpp-tutorial/headers/10-functor2.cpp at main · cpp-tutor/learnmoderncpp-tutorial · GitHub

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// 10-functor2.cpp : function object maintaining state

#include <iostream>

#include <vector>

#include <algorithm>

using namespace std;

struct MinMaxAvg {

void operator()(int i) {

if (first) {

min = max = avg = i;

first = false;

return;

}

if (i < min) {

min = i;

}

if (i > max) {

max = i;

}

avg = ((avg * num) + i) / (num + 1);

++num;

}

int min, max, num{ 1 };

double avg;

bool first{ true };

};

int main() {

vector v{ 3, 5, 2, 6, 2, 4 };

MinMaxAvg f = for_each(begin(v), end(v), MinMaxAvg{});

cout << "Min: " << f.min << " Max: " << f.max

<< " Avg: " << f.avg << " Num: " << f.num << '\n';

}

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