]>
Commit | Line | Data |
---|---|---|
b32b8144 | 1 | // Copyright Louis Dionne 2013-2017 |
7c673cae FG |
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) | |
4 | ||
5 | #include <boost/hana/assert.hpp> | |
6 | #include <boost/hana/ext/std/integral_constant.hpp> | |
7 | #include <boost/hana/find.hpp> | |
8 | #include <boost/hana/find_if.hpp> | |
9 | #include <boost/hana/functional/compose.hpp> | |
10 | #include <boost/hana/integral_constant.hpp> | |
11 | #include <boost/hana/optional.hpp> | |
12 | #include <boost/hana/tuple.hpp> | |
13 | #include <boost/hana/type.hpp> | |
14 | ||
15 | #include <type_traits> | |
16 | namespace hana = boost::hana; | |
17 | ||
18 | ||
19 | // First get the type of the object, and then call the trait on it. | |
20 | constexpr auto is_integral = hana::compose(hana::trait<std::is_integral>, hana::typeid_); | |
21 | constexpr auto is_class = hana::compose(hana::trait<std::is_class>, hana::typeid_); | |
22 | ||
23 | static_assert( | |
24 | hana::find_if(hana::make_tuple(1.0, 2, '3'), is_integral) | |
25 | == | |
26 | hana::just(2) | |
27 | , ""); | |
28 | ||
29 | BOOST_HANA_CONSTANT_CHECK( | |
30 | hana::find_if(hana::make_tuple(1.0, 2, '3'), is_class) | |
31 | == | |
32 | hana::nothing | |
33 | ); | |
34 | ||
35 | BOOST_HANA_CONSTANT_CHECK( | |
36 | hana::find(hana::make_tuple(hana::int_c<1>, hana::char_c<'c'>, hana::type_c<void>), hana::type_c<void>) | |
37 | == | |
38 | hana::just(hana::type_c<void>) | |
39 | ); | |
40 | ||
41 | BOOST_HANA_CONSTANT_CHECK( | |
42 | hana::find(hana::make_tuple(hana::int_c<1>, hana::char_c<'c'>, hana::type_c<void>), hana::type_c<int>) | |
43 | == | |
44 | hana::nothing | |
45 | ); | |
46 | ||
47 | int main() { } |