FM / detail

/usr/include/boost/hana/detail

Name	Size	Mode	Actions
operators/	-	0755	rm
variadic/	-	0755	rm
algorithm.hpp	5973	0644	edit dl rm
any_of.hpp	1380	0644	edit dl rm
array.hpp	3374	0644	edit dl rm
canonical_constant.hpp	2700	0644	edit dl rm
concepts.hpp	3019	0644	edit dl rm
create.hpp	935	0644	edit dl rm
decay.hpp	1715	0644	edit dl rm
dispatch_if.hpp	2082	0644	edit dl rm
ebo.hpp	3874	0644	edit dl rm
fast_and.hpp	600	0644	edit dl rm
first_unsatisfied_index.hpp	1731	0644	edit dl rm
hash_table.hpp	5487	0644	edit dl rm
has_common_embedding.hpp	2473	0644	edit dl rm
has_duplicates.hpp	2337	0644	edit dl rm
index_if.hpp	1610	0644	edit dl rm
integral_constant.hpp	10052	0644	edit dl rm
intrinsics.hpp	1984	0644	edit dl rm
nested_by.hpp	1255	0644	edit dl rm
nested_by_fwd.hpp	1990	0644	edit dl rm
nested_than.hpp	854	0644	edit dl rm
nested_than_fwd.hpp	1624	0644	edit dl rm
nested_to.hpp	788	0644	edit dl rm
nested_to_fwd.hpp	1627	0644	edit dl rm
preprocessor.hpp	1435	0644	edit dl rm
std_common_type.hpp	1085	0644	edit dl rm
struct_macros.hpp	798577	0644	edit dl rm
type_at.hpp	1594	0644	edit dl rm
type_foldl1.hpp	3916	0644	edit dl rm
type_foldr1.hpp	3903	0644	edit dl rm
unpack_flatten.hpp	2416	0644	edit dl rm
void_t.hpp	518	0644	edit dl rm
wrong.hpp	861	0644	edit dl rm

Edit: /usr/include/boost/hana/detail/ebo.hpp (3874B)

/*!
@file
Defines `boost::hana::detail::ebo`.

@copyright Louis Dionne 2013-2016
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_DETAIL_EBO_HPP
#define BOOST_HANA_DETAIL_EBO_HPP

#include <boost/hana/config.hpp>
#include <boost/hana/detail/intrinsics.hpp>

namespace _hana {
    //////////////////////////////////////////////////////////////////////////
    // ebo<K, V>
    //
    // Building block to implement the Empty Base Optimization (EBO). We
    // use a short name and define it in a short namespace to reduce
    // symbol lengths, since this type is used as a building block for
    // other widely used types such as `hana::pair`.
    //
    // When available, we use compiler intrinsics to reduce the number
    // of instantiations.
    //
    // `ebo` provides a limited set of constructors to reduce instantiations.
    // Also, the constructors are open-ended and they do not check for the
    // validity of their arguments, again to reduce compile-time costs.
    // Users of `ebo` should make sure that they only try to construct an
    // `ebo` from a compatible value.
    //
    // EBOs can be indexed using an arbitrary type. The recommended usage is
    // to define an integrap constant wrapper for the specific container using
    // EBO, and then index using that wrapper:
    //
    //      template <int> struct idx; // wrapper for tuple
    //      template <typename ...T>
    //      struct tuple : ebo<idx<0>, T0>, ebo<idx<1>, T1>, ... { };
    //
    // The reason for defining one wrapper per container is to avoid any issues
    // that can arise when using `ebo_get`, which casts to the base class. If
    // `tuple` and `pair` are inheritting from `ebo`s with the same indexing
    // scheme, trying to use `ebo_get` on a tuple of pairs will trigger an
    // ambiguous base class conversion, since both tuple and pair inherit
    // from `ebo`s with the same keys.
    //////////////////////////////////////////////////////////////////////////
    template <typename K, typename V, bool =
        BOOST_HANA_TT_IS_EMPTY(V) && !BOOST_HANA_TT_IS_FINAL(V)
    >
    struct ebo;

// Specialize storage for empty types
    template <typename K, typename V>
    struct ebo<K, V, true> : V {
        constexpr ebo() { }

template <typename T>
        explicit constexpr ebo(T&& t)
            : V(static_cast<T&&>(t))
        { }
    };

// Specialize storage for non-empty types
    template <typename K, typename V>
    struct ebo<K, V, false> {
        constexpr ebo() : data_() { }

template <typename T>
        explicit constexpr ebo(T&& t)
            : data_(static_cast<T&&>(t))
        { }

V data_;
    };

//////////////////////////////////////////////////////////////////////////
    // ebo_get
    //////////////////////////////////////////////////////////////////////////
    template <typename K, typename V>
    constexpr V const& ebo_get(ebo<K, V, true> const& x)
    { return x; }

template <typename K, typename V>
    constexpr V& ebo_get(ebo<K, V, true>& x)
    { return x; }

template <typename K, typename V>
    constexpr V&& ebo_get(ebo<K, V, true>&& x)
    { return static_cast<V&&>(x); }

template <typename K, typename V>
    constexpr V const& ebo_get(ebo<K, V, false> const& x)
    { return x.data_; }

template <typename K, typename V>
    constexpr V& ebo_get(ebo<K, V, false>& x)
    { return x.data_; }

template <typename K, typename V>
    constexpr V&& ebo_get(ebo<K, V, false>&& x)
    { return static_cast<V&&>(x.data_); }
} // end namespace _hana

BOOST_HANA_NAMESPACE_BEGIN
    namespace detail {
        using ::_hana::ebo;
        using ::_hana::ebo_get;
    }
BOOST_HANA_NAMESPACE_END

#endif // !BOOST_HANA_DETAIL_EBO_HPP

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