#include <iostream>
#include <string>
#include <algorithm>
using namespace std;
 
struct person {
	string name;
	int age;
};
typedef person const &person_view;
 
namespace compare_person {
	bool by_age(person_view lhs, person_view rhs) {
		return lhs.age < rhs.age;
	}
}
 
int main() {
	person people[] = {
		{"Julie", 8},
		{"Douglas", 32},
		{"Peter", 16},
		{"Mark", 11}
	};
 
	sort(begin(people), end(people), compare_person::by_age);
 
	for(person_view person: people) {
		cout << person.name << ": " << person.age << "\n";
	}
 
	return 0;
}

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