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Since CMake 3.19 it is possible to specify private sources for `INTERFACE` targets. This makes the library turn up like compiled libraries in IDEs such as Visual Studio. It can also be specified in the `add_library` call but using `target_sources` is more isolated to the CMake version check
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.