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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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/product.hpp (1701B)

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

@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_PRODUCT_HPP
#define BOOST_HANA_PRODUCT_HPP

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

#include <boost/hana/concept/foldable.hpp>
#include <boost/hana/concept/ring.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/core/dispatch.hpp>
#include <boost/hana/fold_left.hpp>
#include <boost/hana/integral_constant.hpp> // required by fwd decl
#include <boost/hana/mult.hpp>
#include <boost/hana/one.hpp>

BOOST_HANA_NAMESPACE_BEGIN
    //! @cond
    template <typename R>
    template <typename Xs>
    constexpr decltype(auto) product_t<R>::operator()(Xs&& xs) const {
        using S = typename hana::tag_of<Xs>::type;
        using Product = BOOST_HANA_DISPATCH_IF(product_impl<S>,
            hana::Foldable<S>::value
        );

#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
        static_assert(hana::Ring<R>::value,
        "hana::product<R> requires 'R' to be a Ring");

static_assert(hana::Foldable<S>::value,
        "hana::product<R>(xs) requires 'xs' to be Foldable");
    #endif

return Product::template apply<R>(static_cast<Xs&&>(xs));
    }
    //! @endcond

template <typename T, bool condition>
    struct product_impl<T, when<condition>> : default_ {
        template <typename R, typename Xs>
        static constexpr decltype(auto) apply(Xs&& xs) {
            return hana::fold_left(static_cast<Xs&&>(xs), hana::one<R>(), hana::mult);
        }
    };
BOOST_HANA_NAMESPACE_END

#endif // !BOOST_HANA_PRODUCT_HPP

/*! @file Defines `boost::hana::product`. @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_PRODUCT_HPP #define BOOST_HANA_PRODUCT_HPP #include #include #include #include #include #include #include // required by fwd decl #include #include BOOST_HANA_NAMESPACE_BEGIN //! @cond template template constexpr decltype(auto) product_t::operator()(Xs&& xs) const { using S = typename hana::tag_of::type; using Product = BOOST_HANA_DISPATCH_IF(product_impl, hana::Foldable::value ); #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS static_assert(hana::Ring::value, "hana::product requires 'R' to be a Ring"); static_assert(hana::Foldable::value, "hana::product(xs) requires 'xs' to be Foldable"); #endif return Product::template apply(static_cast(xs)); } //! @endcond template struct product_impl> : default_ { template static constexpr decltype(auto) apply(Xs&& xs) { return hana::fold_left(static_cast(xs), hana::one(), hana::mult); } }; BOOST_HANA_NAMESPACE_END #endif // !BOOST_HANA_PRODUCT_HPP