Edit: /usr/include/boost/hana/power.hpp (1954B)
/*!
@file
Defines `boost::hana::power`.
@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_POWER_HPP
#define BOOST_HANA_POWER_HPP
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
BOOST_HANA_NAMESPACE_BEGIN
//! @cond
template
constexpr decltype(auto) power_t::operator()(X&& x, N const& n) const {
using R = typename hana::tag_of::type;
using Power = BOOST_HANA_DISPATCH_IF(power_impl,
hana::Ring::value &&
hana::IntegralConstant::value
);
#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
static_assert(hana::Ring::value,
"hana::power(x, n) requires 'x' to be in a Ring");
static_assert(hana::IntegralConstant::value,
"hana::power(x, n) requires 'n' to be an IntegralConstant");
#endif
static_assert(N::value >= 0,
"hana::power(x, n) requires 'n' to be non-negative");
return Power::apply(static_cast(x), n);
}
//! @endcond
template
struct power_impl> : default_ {
template
static constexpr decltype(auto) apply(X&& x, N const&) {
constexpr std::size_t n = N::value;
return hana::iterate(
hana::partial(hana::mult, static_cast(x)),
hana::one()
);
}
};
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_POWER_HPP