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git.proxmox.com Git - ceph.git/blob - ceph/src/boost/libs/hana/example/ext/boost/mpl/vector/foldable.cpp
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1 // Copyright Louis Dionne 2013-2016
2 // Distributed under the Boost Software License, Version 1.0.
3 // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
5 #include <boost/hana/assert.hpp>
6 #include <boost/hana/equal.hpp>
7 #include <boost/hana/ext/boost/mpl/vector.hpp>
8 #include <boost/hana/ext/std/integral_constant.hpp>
9 #include <boost/hana/fold_left.hpp>
10 #include <boost/hana/if.hpp>
11 #include <boost/hana/integral_constant.hpp>
12 #include <boost/hana/plus.hpp>
13 #include <boost/hana/type.hpp>
15 #include <boost/mpl/vector.hpp>
16 #include <type_traits>
17 namespace hana
= boost::hana
;
18 namespace mpl
= boost::mpl
;
21 auto types
= mpl::vector
<long, float, short, float, long, long double>{};
22 auto number_of_floats
= hana::fold_left(types
, hana::int_c
<0>, [](auto count
, auto t
) {
23 return hana::if_(hana::trait
<std::is_floating_point
>(t
),
24 count
+ hana::int_c
<1>,
29 BOOST_HANA_CONSTANT_CHECK(number_of_floats
== hana::int_c
<3>);