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  <title>null_mapped_type Interface</title>
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    <h1><tt>null_mapped_type</tt> Interface</h1>

    <p>A mapped-policy indicating that an associative container is
    a "set"</p>

    <p>Defined in: <a href=
    "../../../../include/ext/pb_ds/tag_and_trait.hpp"><tt>tag_and_trait.hpp</tt></a></p>
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