Теория. Универсальные функции вывода контейнеров

RobertDeMilo

Oct 28th, 2023

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#include <iostream>
#include <map>
#include <set>
#include <vector>
using namespace std;
template <typename First, typename Second>
ostream& operator<<(ostream& out, const pair<First, Second>& p) {
return out << '(' << p.first << ", "s << p.second << ')';
}
template <typename Container>
void Print(ostream& out, const Container& container) {
bool is_first = true;
for (const auto& element : container) {
if (!is_first) {
out << ", "s;
}
is_first = false;
out << element;
}
}
template <typename Element>
ostream& operator<<(ostream& out, const vector<Element>& container) {
out << '[';
Print(out, container);
out << ']';
return out;
}
template <typename Element>
ostream& operator<<(ostream& out, const set<Element>& container) {
out << '{';
Print(out, container);
out << '}';
return out;
}
template <typename Key, typename Value>
ostream& operator<<(ostream& out, const map<Key, Value>& container) {
out << '<';
Print(out, container);
out << '>';
return out;
}
int main() {
setlocale(LC_ALL, "ru");
const set<string> cats = { "Мурка"s, "Белка"s, "Георгий"s, "Рюрик"s };
cout << cats << endl;
const vector<int> ages = { 10, 5, 2, 12 };
cout << ages << endl;
const map<string, int> cat_ages = {
{"Мурка"s, 10},
{"Белка"s, 5},
{"Георгий"s, 2},
{"Рюрик"s, 12}
};
cout << cat_ages << endl;
}
/////////////////////////////////////////////////////////////////
Мои попыточки
#include <iostream>
#include <vector>
#include <map>
#include <set>
using namespace std;
template <typename First, typename Second>
ostream& operator<<(ostream& out, const pair<First, Second>& p) {
return out << '(' << p.first << ", "s << p.second << ')';
}
//с const работать не будет!
template <typename Container>
ostream& operator<<(ostream& out, Container& container) {
bool is_first = true;
for (const auto& element : container) {
if (!is_first) {
out << ", "s; без s работать не будет!
}
is_first = false;
out << element;
}
return out;
}
int main() {
//для строк не работает
const set<string> cats = { "Мурка"s, "Белка"s, "Георгий"s, "Рюрик"s };
cout << cats << endl;
const set<int> ages = { 10, 5, 2, 12 };
cout << ages << endl;
}

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