Null object: Difference between revisions

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 }</lang>
-boost::optional is available for cases where the programmer wishes to pass by value, but still support a null value.
+std::optional is available since C++17 (or Boost's boost::optional via boost/optional.hpp for earlier standards) for cases where the programmer wishes to pass by value, but still support a null value.
 <lang cpp>
-#include <boost/optional.hpp>
 #include <iostream>
+#include <optional>
-boost::optional<int> maybeInt()
+std::optional<int> maybeInt()
 int main()
 {
-  boost::optional<int> maybe = maybeInt();
+  std::optional<int> maybe = maybeInt();
   if(!maybe)