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10.1.5 C++ Location Values

When the directive %locations is used, the C++ parser supports location tracking, see Tracking Locations.

By default, two auxiliary classes define a position, a single point in a file, and a location, a range composed of a pair of positions (possibly spanning several files). If the %define variable api.location.type is defined, then these classes will not be generated, and the user defined type will be used.