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This is an older version of Boost and was released in 2018. The current version is 1.89.0.
Spirit supports the creation
of a default parser or a default generator from a given attribute type.
It implements a minimal set of predefined mappings from different attribute
types to parsers and generators (for a description of the predefined mappings
see Additional
Attribute Requirements for Parsers and Additional
Attribute Requirements for Generators). The customization points
described in this section (traits::create_parser and traits::create_generator) can be specialized
to define additional mappings for custom data types.