Edit: /usr/include/boost/hana/extend.hpp (1498B)
/*!
@file
Defines `boost::hana::extend`.
@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_EXTEND_HPP
#define BOOST_HANA_EXTEND_HPP
#include
#include
#include
#include
#include
#include
BOOST_HANA_NAMESPACE_BEGIN
//! @cond
template
constexpr decltype(auto) extend_t::operator()(W_&& w, F&& f) const {
using W = typename hana::tag_of::type;
using Extend = BOOST_HANA_DISPATCH_IF(extend_impl,
hana::Comonad::value
);
#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
static_assert(hana::Comonad::value,
"hana::extend(w, f) requires 'w' to be a Comonad");
#endif
return Extend::apply(static_cast(w), static_cast(f));
}
//! @endcond
template
struct extend_impl> : default_ {
template
static constexpr decltype(auto) apply(X&& x, F&& f) {
return hana::transform(hana::duplicate(static_cast(x)),
static_cast(f));
}
};
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_EXTEND_HPP