63e88f80
 Hu Chunming
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/*!
@file
Forward declares `boost::hana::fill`.
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_FILL_HPP
#define BOOST_HANA_FWD_FILL_HPP
#include <boost/hana/config.hpp>
#include <boost/hana/core/when.hpp>
namespace boost { namespace hana {
//! Replace all the elements of a structure with a fixed value.
//! @ingroup group-Functor
//!
//!
//! Signature
//! ---------
//! Given `F` a Functor, the signature is
//! \f$
//! \mathtt{fill} : F(T) \times U \to F(U)
//! \f$
//!
//! @param xs
//! The structure to fill with a `value`.
//!
//! @param value
//! A value by which every element `x` of the structure is replaced,
//! unconditionally.
//!
//!
//! Example
//! -------
//! @include example/fill.cpp
#ifdef BOOST_HANA_DOXYGEN_INVOKED
constexpr auto fill = [](auto&& xs, auto&& value) {
return tag-dispatched;
};
#else
template <typename Xs, typename = void>
struct fill_impl : fill_impl<Xs, when<true>> { };
struct fill_t {
template <typename Xs, typename Value>
constexpr auto operator()(Xs&& xs, Value&& value) const;
};
BOOST_HANA_INLINE_VARIABLE constexpr fill_t fill{};
#endif
}} // end namespace boost::hana
#endif // !BOOST_HANA_FWD_FILL_HPP
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