Update 010_map_insert_or_assign.cpp

ls-Brynn · web-flow · commit ef90e2863c4e · 2021-07-22T21:54:12.000+08:00
diff --git a/cpp_17/010_map_insert_or_assign.cpp b/cpp_17/010_map_insert_or_assign.cpp
@@ -1 +1,24 @@
-1
+#include <iostream>
+#include <map>
+#include <string>
+ 
+auto print_node = [](const auto &node) {
+    std::cout << "[" << node.first << "] = " << node.second << '\n';
+};
+ 
+auto print_result = [](auto const &pair) {
+    std::cout << (pair.second ? "inserted: " : "assigned: ");
+    print_node(*pair.first);
+};
+ 
+int main()
+{
+    std::map<std::string, std::string> myMap;
+ 
+    print_result( myMap.insert_or_assign("a", "apple"     ) );
+    print_result( myMap.insert_or_assign("b", "banana"    ) );
+    print_result( myMap.insert_or_assign("c", "cherry"    ) );
+    print_result( myMap.insert_or_assign("c", "clementine") );
+ 
+    for (const auto &node : myMap) { print_node(node); }
+}
