Exploring optional return values.

PPP3/ex08.cpp

@@ -1,8 +1,31 @@
 #include <iostream>
+#include <optional>
+#include <string>
 
 using namespace std;
 
+optional<string> create(bool b)
+{
+  if(b) {
+    return "Godzilla";
+  } else {
+    return {};
+  }
+}
+
+auto create2(bool b)
+{
+  return b ? optional<string>{"Godzilla"} : nullopt;
+}
+
 int main()
 {
+  cout << "create(false) returned "
+    << create(false).value_or("empty") << "\n";
+
+  if(auto str = create2(true)) {
+    cout << "create2(true) returned " << *str << " with size " << str->size() << "\n";
+  }
+
   return 0;
 }