Server : Apache/2.4.41 (Ubuntu) System : Linux absol.cf 5.4.0-198-generic #218-Ubuntu SMP Fri Sep 27 20:18:53 UTC 2024 x86_64 User : www-data ( 33) PHP Version : 7.4.33 Disable Function : pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_get_handler,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,pcntl_async_signals,pcntl_unshare, Directory :  /proc/self/root/usr/include/boost/hana/fwd/

Upload File : current_dir [ Writeable ] document_root [ Writeable ]

/*!
@file
Forward declares `boost::hana::transform`.

@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_FWD_TRANSFORM_HPP
#define BOOST_HANA_FWD_TRANSFORM_HPP

#include <boost/hana/config.hpp>
#include <boost/hana/core/when.hpp>


BOOST_HANA_NAMESPACE_BEGIN
    //! Map a function over a `Functor`.
    //! @ingroup group-Functor
    //!
    //!
    //! Signature
    //! ---------
    //! Given `F` a Functor, the signature is
    //! \f$
    //!     \mathtt{transform} : F(T) \times (T \to U) \to F(U)
    //! \f$
    //!
    //! @param xs
    //! The structure to map `f` over.
    //!
    //! @param f
    //! A function called as `f(x)` on element(s) `x` of the structure,
    //! and returning a new value to replace `x` in the structure.
    //!
    //!
    //! Example
    //! -------
    //! @include example/transform.cpp
#ifdef BOOST_HANA_DOXYGEN_INVOKED
    constexpr auto transform = [](auto&& xs, auto&& f) {
        return tag-dispatched;
    };
#else
    template <typename Xs, typename = void>
    struct transform_impl : transform_impl<Xs, when<true>> { };

    struct transform_t {
        template <typename Xs, typename F>
        constexpr auto operator()(Xs&& xs, F&& f) const;
    };

    constexpr transform_t transform{};
#endif
BOOST_HANA_NAMESPACE_END

#endif // !BOOST_HANA_FWD_TRANSFORM_HPP