63e88f80
 Hu Chunming
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/*!
@file
Forward declares `boost::hana::adjust`.
Copyright Louis Dionne 2013-2022
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_HPP
#define BOOST_HANA_FWD_ADJUST_HPP
#include <boost/hana/config.hpp>
#include <boost/hana/core/when.hpp>
namespace boost { namespace hana {
//! Apply a function on all the elements of a structure that compare
//! equal to some value.
//! @ingroup group-Functor
//!
//!
//! Signature
//! ---------
//! Given `F` a Functor and `U` a type that can be compared with `T`'s,
//! the signature is
//! \f$
//! \mathtt{adjust} : F(T) \times U \times (T \to T) \to F(T)
//! \f$
//!
//! @param xs
//! The structure to adjust with `f`.
//!
//! @param value
//! An object that is compared with each element `x` of the structure.
//! Elements of the structure that compare equal to `value` are adjusted
//! with the `f` function.
//!
//! @param f
//! A function called as `f(x)` on the element(s) of the structure that
//! compare equal to `value`.
//!
//!
//! Example
//! -------
//! @include example/adjust.cpp
#ifdef BOOST_HANA_DOXYGEN_INVOKED
constexpr auto adjust = [](auto&& xs, auto&& value, auto&& f) {
return tag-dispatched;
};
#else
template <typename Xs, typename = void>
struct adjust_impl : adjust_impl<Xs, when<true>> { };
struct adjust_t {
template <typename Xs, typename Value, typename F>
constexpr auto operator()(Xs&& xs, Value&& value, F&& f) const;
};
BOOST_HANA_INLINE_VARIABLE constexpr adjust_t adjust{};
#endif
}} // end namespace boost::hana
#endif // !BOOST_HANA_FWD_ADJUST_HPP
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