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

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+
+// 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]