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📂 / (Root) / opt / cpanel / ea-ruby27 / src / passenger-release-6.1.5 / src / cxx_supportlib / vendor-modified / boost / core

📍 /opt/cpanel/ea-ruby27/src/passenger-release-6.1.5/src/cxx_supportlib/vendor-modified/boost/core

✏️ Editing: identity.hpp Read Only

/*
Copyright 2021-2023 Glen Joseph Fernandes
(glenjofe@gmail.com)

Distributed under the Boost Software License, Version 1.0.
(http://www.boost.org/LICENSE_1_0.txt)
*/
#ifndef BOOST_CORE_IDENTITY_HPP
#define BOOST_CORE_IDENTITY_HPP

#include <boost/config.hpp>
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
#include <utility>
#endif

namespace boost {

struct identity {
    typedef void is_transparent;

#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
    template<class T>
    BOOST_CONSTEXPR T&& operator()(T&& value) const BOOST_NOEXCEPT {
        return std::forward<T>(value);
    }
#else
    template<class T>
    BOOST_CONSTEXPR const T& operator()(const T& value) const BOOST_NOEXCEPT {
        return value;
    }

template<class T>
    BOOST_CONSTEXPR T& operator()(T& value) const BOOST_NOEXCEPT {
        return value;
    }
#endif

template<class>
    struct result { };

template<class T>
    struct result<identity(T&)> {
        typedef T& type;
    };

#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
    template<class T>
    struct result<identity(T)> {
        typedef T&& type;
    };

template<class T>
    struct result<identity(T&&)> {
        typedef T&& type;
    };
#endif
};

} /* boost */

#endif

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