tg_windows5.12.6/Telegram/ThirdParty/range-v3/example/for_each_assoc.cpp

// Range v3 library
//
//  Copyright Jeff Garland 2017
//
//  Use, modification and distribution is subject to the
//  Boost Software License, Version 1.0. (See accompanying
//  file LICENSE_1_0.txt or copy at
//  http://www.boost.org/LICENSE_1_0.txt)
//
// Project home: https://github.com/ericniebler/range-v3
//

///[for_each_assoc]
// for_each with associative containers
// output
// set:           1 2 3 4 5 6
// map:           one:1 three:3 two:2
// unordered_map: three:3 one:1 two:2
// unordered_set: 6 5 4 3 2 1

#include <iostream>
#include <map>
#include <range/v3/algorithm/for_each.hpp>
#include <set>
#include <string>
#include <unordered_map>
#include <unordered_set>
using std::cout;
using std::string;

auto print = [](int i) { cout << i << ' '; };
// must take a pair for map types
auto printm = [](std::pair<string, int> p) {
    cout << p.first << ":" << p.second << ' ';
};

int
main()
{
    cout << "set:           ";
    std::set<int> si{1, 2, 3, 4, 5, 6};
    ranges::for_each(si, print);

    cout << "\nmap:           ";
    std::map<string, int> msi{{"one", 1}, {"two", 2}, {"three", 3}};
    ranges::for_each(msi, printm);

    cout << "\nunordered map: ";
    std::unordered_map<string, int> umsi{{"one", 1}, {"two", 2}, {"three", 3}};
    ranges::for_each(umsi, printm);

    cout << "\nunordered set: ";
    std::unordered_set<int> usi{1, 2, 3, 4, 5, 6};
    ranges::for_each(usi, print);
    cout << '\n';
}
///[for_each_assoc]