FM / functional

/usr/include/boost/hana/functional

Name	Size	Mode	Actions
always.hpp	1790	0644	edit dl rm
apply.hpp	2940	0644	edit dl rm
arg.hpp	5116	0644	edit dl rm
capture.hpp	3498	0644	edit dl rm
compose.hpp	3393	0644	edit dl rm
curry.hpp	5716	0644	edit dl rm
demux.hpp	9550	0644	edit dl rm
fix.hpp	2758	0644	edit dl rm
flip.hpp	2071	0644	edit dl rm
id.hpp	905	0644	edit dl rm
infix.hpp	6462	0644	edit dl rm
iterate.hpp	6254	0644	edit dl rm
lockstep.hpp	3610	0644	edit dl rm
on.hpp	2291	0644	edit dl rm
overload.hpp	2681	0644	edit dl rm
overload_linearly.hpp	3707	0644	edit dl rm
partial.hpp	3237	0644	edit dl rm
placeholder.hpp	12985	0644	edit dl rm
reverse_partial.hpp	3269	0644	edit dl rm

Edit: /usr/include/boost/hana/functional/overload.hpp (2681B)

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

@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_FUNCTIONAL_OVERLOAD_HPP
#define BOOST_HANA_FUNCTIONAL_OVERLOAD_HPP

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

BOOST_HANA_NAMESPACE_BEGIN
    //! @ingroup group-functional
    //! Pick one of several functions to call based on overload resolution.
    //!
    //! Specifically, `overload(f1, f2, ..., fn)` is a function object such
    //! that
    //! @code
    //!     overload(f1, f2, ..., fn)(x...) == fk(x...)
    //! @endcode
    //!
    //! where `fk` is the function of `f1, ..., fn` that would be called if
    //! overload resolution was performed amongst that set of functions only.
    //! If more than one function `fk` would be picked by overload resolution,
    //! then the call is ambiguous.
    //!
    //! ### Example
    //! @include example/functional/overload.cpp
#ifdef BOOST_HANA_DOXYGEN_INVOKED
    constexpr auto overload = [](auto&& f1, auto&& f2, ..., auto&& fn) {
        return [perfect-capture](auto&& ...x) -> decltype(auto) {
            return forwarded(fk)(forwarded(x)...);
        };
    };
#else
    template <typename F, typename ...G>
    struct overload_t
        : overload_t<F>::type
        , overload_t<G...>::type
    {
        using type = overload_t;
        using overload_t<F>::type::operator();
        using overload_t<G...>::type::operator();

template <typename F_, typename ...G_>
        constexpr explicit overload_t(F_&& f, G_&& ...g)
            : overload_t<F>::type(static_cast<F_&&>(f))
            , overload_t<G...>::type(static_cast<G_&&>(g)...)
        { }
    };

template <typename F>
    struct overload_t<F> { using type = F; };

template <typename R, typename ...Args>
    struct overload_t<R(*)(Args...)> {
        using type = overload_t;
        R (*fptr_)(Args...);

explicit constexpr overload_t(R (*fp)(Args...))
            : fptr_(fp)
        { }

constexpr R operator()(Args ...args) const
        { return fptr_(static_cast<Args&&>(args)...); }
    };

struct make_overload_t {
        template <typename ...F,
            typename Overload = typename overload_t<
                typename detail::decay<F>::type...
            >::type
        >
        constexpr Overload operator()(F&& ...f) const {
            return Overload(static_cast<F&&>(f)...);
        }
    };

constexpr make_overload_t overload{};
#endif
BOOST_HANA_NAMESPACE_END

#endif // !BOOST_HANA_FUNCTIONAL_OVERLOAD_HPP

/*! @file Defines `boost::hana::overload`. @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_FUNCTIONAL_OVERLOAD_HPP #define BOOST_HANA_FUNCTIONAL_OVERLOAD_HPP #include #include BOOST_HANA_NAMESPACE_BEGIN //! @ingroup group-functional //! Pick one of several functions to call based on overload resolution. //! //! Specifically, `overload(f1, f2, ..., fn)` is a function object such //! that //! @code //! overload(f1, f2, ..., fn)(x...) == fk(x...) //! @endcode //! //! where `fk` is the function of `f1, ..., fn` that would be called if //! overload resolution was performed amongst that set of functions only. //! If more than one function `fk` would be picked by overload resolution, //! then the call is ambiguous. //! //! ### Example //! @include example/functional/overload.cpp #ifdef BOOST_HANA_DOXYGEN_INVOKED constexpr auto overload = [](auto&& f1, auto&& f2, ..., auto&& fn) { return [perfect-capture](auto&& ...x) -> decltype(auto) { return forwarded(fk)(forwarded(x)...); }; }; #else template struct overload_t : overload_t::type , overload_t::type { using type = overload_t; using overload_t::type::operator(); using overload_t::type::operator(); template constexpr explicit overload_t(F_&& f, G_&& ...g) : overload_t::type(static_cast(f)) , overload_t::type(static_cast(g)...) { } }; template struct overload_t { using type = F; }; template struct overload_t { using type = overload_t; R (*fptr_)(Args...); explicit constexpr overload_t(R (*fp)(Args...)) : fptr_(fp) { } constexpr R operator()(Args ...args) const { return fptr_(static_cast(args)...); } }; struct make_overload_t { template ::type... >::type > constexpr Overload operator()(F&& ...f) const { return Overload(static_cast(f)...); } }; constexpr make_overload_t overload{}; #endif BOOST_HANA_NAMESPACE_END #endif // !BOOST_HANA_FUNCTIONAL_OVERLOAD_HPP