Update cmap-example

examples/cmap-example/cmap-example.cpp

@@ -2,17 +2,18 @@
 // there are two: std::map automatically sorts on key; std::unordered_map does not
 
 #include <map>
+#include <string>
 
 int main() {
     std::map<std::string, int> dict;
 
-    dict["apple"] = 5;
-    dict["banana"] = 2;
-    dict["orange"] = 7;
+    dict[std::string("apple")] = 5;
+    dict[std::string("banana")] = 2;
+    dict[std::string("orange")] = 7;
 
 
     // Accessing elements in the map
-    printf("Value of apple: %d\n", dict["apple"]);
+    printf("Value of apple: %d\n", dict[std::string("apple")]);
 
     for (const auto& pair : dict) {
     printf("Key: %s, Value: $s\n", pair.first, pair.second);