summaryrefslogtreecommitdiff log msg author committer range
 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69  /*! @file Forward declares boost::hana::adjust_if. @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_ADJUST_IF_HPP #define BOOST_HANA_FWD_ADJUST_IF_HPP #include #include BOOST_HANA_NAMESPACE_BEGIN //! Apply a function on all the elements of a structure satisfying a predicate. //! @ingroup group-Functor //! //! Given a Functor, a predicate pred and a function f, adjust_if //! will _adjust_ the elements of the Functor that satisfy the predicate //! with the function f. In other words, adjust_if will return a new //! Functor equal to the original one, except that the elements satisfying //! the predicate will be transformed with the given function. Elements //! for which the predicate is not satisfied are left untouched, and they //! are kept as-is in the resulting Functor. //! //! //! Signature //! --------- //! Given a Functor F and a Logical Bool, the signature is //! \f$//! \mathtt{adjust\_if} : F(T) \times (T \to Bool) \times (T \to T) \to F(T) //! \f$ //! //! @param xs //! The structure to adjust with f. //! //! @param pred //! A function called as pred(x) for each element of the Functor, //! and returning whether f should be applied on that element. //! //! @param f //! A function called as f(x) on the element(s) of the Functor that //! satisfy the predicate. //! //! //! Example //! ------- //! @include example/adjust_if.cpp #ifdef BOOST_HANA_DOXYGEN_INVOKED constexpr auto adjust_if = [](auto&& xs, auto const& pred, auto const& f) { return tag-dispatched; }; #else template struct adjust_if_impl : adjust_if_impl> { }; struct adjust_if_t { template constexpr auto operator()(Xs&& xs, Pred const& pred, F const& f) const; }; constexpr adjust_if_t adjust_if{}; #endif BOOST_HANA_NAMESPACE_END #endif // !BOOST_HANA_FWD_ADJUST_IF_HPP