Chapter 9: excercise 2

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

class Name_pairs {
public:
    Name_pairs(std::string name, double age);
    Name_pairs() = default;
    void read_names(std::string name);
    void read_age(double age);
    void print() const;
    void sort();

private:
    std::vector<std::string>name_;
    std::vector<double>age_;
};

Name_pairs::Name_pairs(std::string name, double age) : name_{ name }, age_{ age } {
    assert(name_.size() == age_.size());
    assert(name_.size() != 0 && age>= 0);
}

void Name_pairs::read_names(std::string name){
    assert(!name.empty());
    name_.push_back(name);
}

void Name_pairs::read_age(double age){
    assert(age >= 0);
    age_.push_back(age);
}

void Name_pairs::print() const{
    assert(name_.size() == age_.size());

    if (name_.empty() || age_.empty()) {
        std::cout << "No data to print." << std::endl;
        return;
    }

    for (size_t i = 0; i != name_.size() && i != age_.size(); ++i) {
        std::cout << name_[i] << " " << age_[i] << std::endl;
    }
}

void Name_pairs::sort() {
    assert(name_.size() == age_.size());

    if (name_.empty() || age_.empty()) {
        std::cout << "No data to sort." << std::endl;
        return;
    }

    std::vector<std::pair<std::string, double>>temp_pair;
    for (size_t i = 0; i != name_.size(); ++i) {
        temp_pair.push_back(std::make_pair(name_[i], age_[i]));
    }

    std::sort(temp_pair.begin(), temp_pair.end(), [](const auto& one, const auto& two) {
        return one.first < two.first;
        });

    for (size_t i = 0; i < temp_pair.size(); ++i) {
        name_[i] = temp_pair[i].first;
        age_[i] = temp_pair[i].second;
    }

}


int main() {
    Name_pairs person_{"Victory", 35 };
    person_.read_age(25);
    person_.read_names("K");

    person_.read_names("Adele");
    person_.read_age(25);

    person_.read_names("Pavel");
    person_.read_age(63);

    person_.print();
    person_.sort();
    person_.print();
}