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 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  /*! @file Forward declares boost::hana::replace_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_REPLACE_IF_HPP #define BOOST_HANA_FWD_REPLACE_IF_HPP #include #include BOOST_HANA_NAMESPACE_BEGIN //! Replace all the elements of a structure satisfying a predicate //! with a fixed value. //! @ingroup group-Functor //! //! //! Signature //! --------- //! Given F a Functor and Bool a Logical, the signature is //! \f$//! \mathtt{replace_if} : F(T) \times (T \to Bool) \times T \to F(T) //! \f$ //! //! @param xs //! The structure to replace elements of. //! //! @param predicate //! A function called as predicate(x) for element(s) x of the //! structure and returning a Logical representing whether x //! should be replaced by value. //! //! @param value //! A value by which every element x of the structure for which //! predicate returns a true-valued Logical is replaced. //! //! //! Example //! ------- //! @include example/replace_if.cpp #ifdef BOOST_HANA_DOXYGEN_INVOKED constexpr auto replace_if = [](auto&& xs, auto&& predicate, auto&& value) { return tag-dispatched; }; #else template struct replace_if_impl : replace_if_impl> { }; struct replace_if_t { template constexpr auto operator()(Xs&& xs, Pred&& pred, Value&& value) const; }; constexpr replace_if_t replace_if{}; #endif BOOST_HANA_NAMESPACE_END #endif // !BOOST_HANA_FWD_REPLACE_IF_HPP