FM / hana

/usr/include/boost/hana

Name	Size	Mode	Actions
concept/	-	0755	rm
core/	-	0755	rm
detail/	-	0755	rm
experimental/	-	0755	rm
ext/	-	0755	rm
functional/	-	0755	rm
fwd/	-	0755	rm
accessors.hpp	1513	0644	edit dl rm
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bool.hpp	9747	0644	edit dl rm
cartesian_product.hpp	3860	0644	edit dl rm
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if.hpp	1834	0644	edit dl rm
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integral_constant.hpp	389	0644	edit dl rm
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zip_with.hpp	2292	0644	edit dl rm

Edit: /usr/include/boost/hana/if.hpp (1834B)

/*!
@file
Defines `boost::hana::if_`.

@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_IF_HPP
#define BOOST_HANA_IF_HPP

#include <boost/hana/fwd/if.hpp>

#include <boost/hana/concept/logical.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/core/dispatch.hpp>
#include <boost/hana/eval_if.hpp>

BOOST_HANA_NAMESPACE_BEGIN
    //! @cond
    template <typename Cond, typename Then, typename Else>
    constexpr decltype(auto) if_t::operator()(Cond&& cond, Then&& then_, Else&& else_) const {
        using Bool = typename hana::tag_of<Cond>::type;
        using If = BOOST_HANA_DISPATCH_IF(if_impl<Bool>,
            hana::Logical<Bool>::value
        );

#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
        static_assert(hana::Logical<Bool>::value,
        "hana::if_(cond, then, else) requires 'cond' to be a Logical");
    #endif

return If::apply(static_cast<Cond&&>(cond),
                         static_cast<Then&&>(then_),
                         static_cast<Else&&>(else_));
    }
    //! @endcond

namespace detail {
        template <typename T>
        struct hold {
            T value;
            constexpr T&& operator()() && { return static_cast<T&&>(value); }
        };
    }

template <typename L, bool condition>
    struct if_impl<L, when<condition>> : default_ {
        template <typename C, typename T, typename E>
        static constexpr auto apply(C&& c, T&& t, E&& e) {
            return hana::eval_if(static_cast<C&&>(c),
                detail::hold<T&&>{static_cast<T&&>(t)},
                detail::hold<E&&>{static_cast<E&&>(e)}
            );
        }
    };
BOOST_HANA_NAMESPACE_END

#endif // !BOOST_HANA_IF_HPP

/*! @file Defines `boost::hana::if_`. @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_IF_HPP #define BOOST_HANA_IF_HPP #include #include #include #include #include BOOST_HANA_NAMESPACE_BEGIN //! @cond template constexpr decltype(auto) if_t::operator()(Cond&& cond, Then&& then_, Else&& else_) const { using Bool = typename hana::tag_of::type; using If = BOOST_HANA_DISPATCH_IF(if_impl, hana::Logical::value ); #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS static_assert(hana::Logical::value, "hana::if_(cond, then, else) requires 'cond' to be a Logical"); #endif return If::apply(static_cast(cond), static_cast(then_), static_cast(else_)); } //! @endcond namespace detail { template struct hold { T value; constexpr T&& operator()() && { return static_cast(value); } }; } template struct if_impl> : default_ { template static constexpr auto apply(C&& c, T&& t, E&& e) { return hana::eval_if(static_cast(c), detail::hold{static_cast(t)}, detail::hold{static_cast(e)} ); } }; BOOST_HANA_NAMESPACE_END #endif // !BOOST_HANA_IF_HPP