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boost::pfr::io_fields
// In header: <boost/pfr/io_fields.hpp> template<typename T> ( value);
IO manipulator to read/write simple aggregate value
field-by-field.
Example:
Input and output streaming operators for boost::pfr::io_fields
are symmetric, meaning that you get the original value by streaming it and reading back if each fields streaming operator is symmetric.
See Also : 'Custom printing of aggregates' for info on how to implement your own manipulator with custom format.