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The previous IO operator declarations were made up from multiple code phrase markups with line breaks, where the markup was broken and some of the line breaks were not translated propertly into output. Replace this with proper code blocks. This also resolves the QuickBook warning about line breaks potentially producing invalid BoostBook output.
optional
A library for representing optional (nullable) objects in C++.
optional<int> readInt(); // this function may return either an int or a not-an-int
if (optional<int> oi = readInt()) // did I get a real int
cout << "my int is: " << *oi; // use my int
else
cout << "I have no int";
For more information refer to the documentation provided with this library.