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This class encapsulates values which can be tested for null-ness.
Public Functions
Constructor of an empty instance.
Constructor.
The cast to bool returns true if the instance has a value, false otherwise.
Accesses the contained value, returns a reference to the contained value.
The behaviour is undefined if the object does not contain a value.
Accesses the contained value, returns a pointer to the contained value.
std::runtime_error – if the object does not contain a value
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ErrorHandler
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OutputHandler