Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Streams a field_kind.

std::ostream&
operator<<(
    std::ostream& os,
    field_kind v);
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Streams a column_type.

std::ostream&
operator<<(
    std::ostream& os,
    column_type t);
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