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## Struct template placeholder_of

boost::type_erasure::placeholder_of

## Synopsis

    // In header: <boost/type_erasure/placeholder_of.hpp>

    template<typename T>
    struct placeholder_of {
      // types
      typedef unspecified type;
    };

## Description

A metafunction returning the (const/reference qualified) placeholder corresponding to an any. It will also work for all bases of any, so it can be applied to the `Base` parameter of concept_interface.