Edit: /usr/include/boost/hana/second.hpp (1253B)
/*!
@file
Defines `boost::hana::second`.
@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_SECOND_HPP
#define BOOST_HANA_SECOND_HPP
#include
#include
#include
#include
BOOST_HANA_NAMESPACE_BEGIN
//! @cond
template
constexpr decltype(auto) second_t::operator()(Pair&& pair) const {
using P = typename hana::tag_of::type;
using Second = BOOST_HANA_DISPATCH_IF(second_impl,
hana::Product
::value
);
#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
static_assert(hana::Product
::value,
"hana::second(pair) requires 'pair' to be a Product");
#endif
return Second::apply(static_cast(pair));
}
//! @endcond
template
struct second_impl> : default_ {
template
static constexpr auto apply(Args&& ...) = delete;
};
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_SECOND_HPP