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nonesuch 

struct nonesuch {
    nonesuch() = delete;
    ~nonesuch() = delete;
    nonesuch(const nonesuch&) = delete;
    void operator=(const nonesuch&) = delete;
};

Header: #include <boost/type_traits/nonesuch.hpp>

Type nonesuch is a placeholder type used when the detection idiom fails - see detected.

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Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

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