CПРИНТ № 1 | Лямбда-функции | Урок 4: Захват переменных по ссылке

#include <map>
#include <string>
#include <vector>
#include <algorithm>
#include <iostream>

using namespace std;

int CountAndAddNewDogs(const vector<string>& new_dogs, const map<string, int>& max_amount, map<string, int>& shelter) {
    return count_if(new_dogs.begin(), new_dogs.end(), [&max_amount, &shelter](const string& name) {
        int& current_dog = shelter[name];
        if (current_dog < max_amount.at(name)) {
            ++current_dog;
            return true;
        }
        else
            return false;
        });
}

int main() {
    map<string, int> shelter{
        {"shepard"s, 1},
        {"corgie"s, 3},
    };

    map<string, int> max_amount{
        {"shepard"s, 2},
        {"corgie"s, 3},
        {"shiba inu"s, 1},
    };

    cout << CountAndAddNewDogs({ "shepard"s, "shiba inu"s, "shiba inu"s, "corgie"s }, max_amount, shelter) << endl;
}