FM / std

/usr/include/boost/hana/ext/std

Name	Size	Mode	Actions
array.hpp	6306	0644	edit dl rm
integer_sequence.hpp	5292	0644	edit dl rm
integral_constant.hpp	2975	0644	edit dl rm
pair.hpp	2687	0644	edit dl rm
ratio.hpp	5736	0644	edit dl rm
tuple.hpp	6118	0644	edit dl rm
vector.hpp	3907	0644	edit dl rm

Edit: /usr/include/boost/hana/ext/std/integral_constant.hpp (2975B)

/*!
@file
Adapts `std::integral_constant` for use with Hana.

@copyright Louis Dionne 2013-2017
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
 */

#ifndef BOOST_HANA_EXT_STD_INTEGRAL_CONSTANT_HPP
#define BOOST_HANA_EXT_STD_INTEGRAL_CONSTANT_HPP

#include <boost/hana/concept/integral_constant.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/core/when.hpp>
#include <boost/hana/fwd/core/to.hpp>
#include <boost/hana/fwd/core/tag_of.hpp>
#include <boost/hana/fwd/integral_constant.hpp>

#include <type_traits>

#ifdef BOOST_HANA_DOXYGEN_INVOKED
namespace std {
    //! @ingroup group-ext-std
    //! Adapter for `std::integral_constant`s.
    //!
    //! Provided models
    //! ---------------
    //! 1. `Constant` and `IntegralConstant`\n
    //! A `std::integral_constant` is a model of the `IntegralConstant` and
    //! `Constant` concepts, just like `hana::integral_constant`s are. As a
    //! consequence, they are also implicitly a model of the concepts provided
    //! for all models of `Constant`.
    //! @include example/ext/std/integral_constant.cpp
    template <typename T, T v>
    struct integral_constant { };
}
#endif

BOOST_HANA_NAMESPACE_BEGIN
    namespace ext { namespace std {
        template <typename T>
        struct integral_constant_tag { using value_type = T; };
    }}

namespace detail {
        template <typename T, T v>
        constexpr bool
        is_std_integral_constant(std::integral_constant<T, v>*)
        { return true; }

constexpr bool is_std_integral_constant(...)
        { return false; }

template <typename T, T v>
        constexpr bool
        is_hana_integral_constant(hana::integral_constant<T, v>*)
        { return true; }

constexpr bool is_hana_integral_constant(...)
        { return false; }
    }

template <typename T>
    struct tag_of<T, when<
        detail::is_std_integral_constant((T*)0) &&
        !detail::is_hana_integral_constant((T*)0)
    >> {
        using type = ext::std::integral_constant_tag<
            typename hana::tag_of<typename T::value_type>::type
        >;
    };

//////////////////////////////////////////////////////////////////////////
    // Constant/IntegralConstant
    //////////////////////////////////////////////////////////////////////////
    template <typename T>
    struct IntegralConstant<ext::std::integral_constant_tag<T>> {
        static constexpr bool value = true;
    };

template <typename T, typename C>
    struct to_impl<ext::std::integral_constant_tag<T>, C, when<
        hana::IntegralConstant<C>::value
    >> : embedding<is_embedded<typename C::value_type, T>::value> {
        template <typename N>
        static constexpr auto apply(N const&) {
            return std::integral_constant<T, N::value>{};
        }
    };
BOOST_HANA_NAMESPACE_END

#endif // !BOOST_HANA_EXT_STD_INTEGRAL_CONSTANT_HPP

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