Edit: /usr/include/boost/hana/count.hpp (1496B)
/*!
@file
Defines `boost::hana::count`.
@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_COUNT_HPP
#define BOOST_HANA_COUNT_HPP
#include
#include
#include
#include
#include
#include
BOOST_HANA_NAMESPACE_BEGIN
//! @cond
template
constexpr auto count_t::operator()(Xs&& xs, Value&& value) const {
using S = typename hana::tag_of::type;
using Count = BOOST_HANA_DISPATCH_IF(count_impl,
hana::Foldable::value
);
#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
static_assert(hana::Foldable::value,
"hana::count(xs, value) requires 'xs' to be Foldable");
#endif
return Count::apply(static_cast(xs), static_cast(value));
}
//! @endcond
template
struct count_impl> : default_ {
template
static constexpr auto apply(Xs&& xs, Value&& value) {
return hana::count_if(static_cast(xs),
hana::equal.to(static_cast(value)));
}
};
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_COUNT_HPP