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
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Edit: /usr/include/boost/hana/one.hpp (2432B)

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

@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_ONE_HPP
#define BOOST_HANA_ONE_HPP

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

#include <boost/hana/concept/constant.hpp>
#include <boost/hana/concept/ring.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/core/to.hpp>
#include <boost/hana/core/dispatch.hpp>
#include <boost/hana/detail/canonical_constant.hpp>

#include <type_traits>

BOOST_HANA_NAMESPACE_BEGIN
    //! @cond
    template <typename R>
    constexpr decltype(auto) one_t<R>::operator()() const {
    #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
        static_assert(hana::Ring<R>::value,
        "hana::one<R>() requires 'R' to be a Ring");
    #endif

using One = BOOST_HANA_DISPATCH_IF(one_impl<R>,
            hana::Ring<R>::value
        );

return One::apply();
    }
    //! @endcond

template <typename R, bool condition>
    struct one_impl<R, when<condition>> : default_ {
        template <typename ...Args>
        static constexpr auto apply(Args&& ...) = delete;
    };

//////////////////////////////////////////////////////////////////////////
    // Model for non-boolean arithmetic data types
    //////////////////////////////////////////////////////////////////////////
    template <typename T>
    struct one_impl<T, when<std::is_arithmetic<T>::value &&
                            !std::is_same<bool, T>::value>> {
        static constexpr T apply()
        { return static_cast<T>(1); }
    };

//////////////////////////////////////////////////////////////////////////
    // Model for Constants over a Ring
    //////////////////////////////////////////////////////////////////////////
    namespace detail {
        template <typename C>
        struct constant_from_one {
            static constexpr auto value = hana::one<typename C::value_type>();
            using hana_tag = detail::CanonicalConstant<typename C::value_type>;
        };
    }

template <typename C>
    struct one_impl<C, when<
        hana::Constant<C>::value &&
        Ring<typename C::value_type>::value
    >> {
        static constexpr decltype(auto) apply()
        { return hana::to<C>(detail::constant_from_one<C>{}); }
    };
BOOST_HANA_NAMESPACE_END

#endif // !BOOST_HANA_ONE_HPP

/*! @file Defines `boost::hana::one`. @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_ONE_HPP #define BOOST_HANA_ONE_HPP #include #include #include #include #include #include #include #include BOOST_HANA_NAMESPACE_BEGIN //! @cond template constexpr decltype(auto) one_t::operator()() const { #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS static_assert(hana::Ring::value, "hana::one() requires 'R' to be a Ring"); #endif using One = BOOST_HANA_DISPATCH_IF(one_impl, hana::Ring::value ); return One::apply(); } //! @endcond template struct one_impl> : default_ { template static constexpr auto apply(Args&& ...) = delete; }; ////////////////////////////////////////////////////////////////////////// // Model for non-boolean arithmetic data types ////////////////////////////////////////////////////////////////////////// template struct one_impl::value && !std::is_same::value>> { static constexpr T apply() { return static_cast(1); } }; ////////////////////////////////////////////////////////////////////////// // Model for Constants over a Ring ////////////////////////////////////////////////////////////////////////// namespace detail { template struct constant_from_one { static constexpr auto value = hana::one(); using hana_tag = detail::CanonicalConstant; }; } template struct one_impl::value && Ring::value >> { static constexpr decltype(auto) apply() { return hana::to(detail::constant_from_one{}); } }; BOOST_HANA_NAMESPACE_END #endif // !BOOST_HANA_ONE_HPP