Edit: /usr/include/boost/hana/for_each.hpp (1863B)
/*!
@file
Defines `boost::hana::for_each`.
@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_FOR_EACH_HPP
#define BOOST_HANA_FOR_EACH_HPP
#include
#include
#include
#include
#include
BOOST_HANA_NAMESPACE_BEGIN
//! @cond
template
constexpr void for_each_t::operator()(Xs&& xs, F&& f) const {
using S = typename hana::tag_of::type;
using ForEach = BOOST_HANA_DISPATCH_IF(for_each_impl,
hana::Foldable::value
);
#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
static_assert(hana::Foldable::value,
"hana::for_each(xs, f) requires 'xs' to be Foldable");
#endif
return ForEach::apply(static_cast(xs), static_cast(f));
}
//! @endcond
namespace detail {
template
struct on_each {
F f;
template
constexpr void operator()(Xs&& ...xs) const {
using Swallow = int[];
(void)Swallow{0, ((void)(*f)(static_cast(xs)), 0)...};
}
};
}
template
struct for_each_impl> : default_ {
template
static constexpr void apply(Xs&& xs, F&& f) {
// We use a pointer instead of a reference to avoid a Clang ICE.
hana::unpack(static_cast(xs),
detail::on_each{&f});
}
};
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_FOR_EACH_HPP