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

Returns a range of iterators to the fields with the specified name.

std::pair< const_iterator, const_iterator >
equal_range(
    field name) const;
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Returns a range of iterators to the fields with the specified name.

std::pair< const_iterator, const_iterator >
equal_range(
    string_view name) const;
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