1// Copyright Louis Dionne 2013-2022
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/equal.hpp>
7#include <boost/hana/transform.hpp>
8#include <boost/hana/tuple.hpp>
9#include <boost/hana/type.hpp>
10namespace hana = boost::hana;
11
12
13template <typename ...>
14struct F { struct type; };
15
16struct x1;
17struct x2;
18struct x3;
19struct x4;
20
21int main() {
22 // transform with tuple_t and a metafunction
23 BOOST_HANA_CONSTANT_CHECK(hana::equal(
24 hana::transform(hana::tuple_t<>, hana::metafunction<F>),
25 hana::tuple_t<>
26 ));
27
28 BOOST_HANA_CONSTANT_CHECK(hana::equal(
29 hana::transform(hana::tuple_t<x1>, hana::metafunction<F>),
30 hana::tuple_t<F<x1>::type>
31 ));
32
33 BOOST_HANA_CONSTANT_CHECK(hana::equal(
34 hana::transform(hana::tuple_t<x1, x2>, hana::metafunction<F>),
35 hana::tuple_t<F<x1>::type, F<x2>::type>
36 ));
37
38 BOOST_HANA_CONSTANT_CHECK(hana::equal(
39 hana::transform(hana::tuple_t<x1, x2, x3>, hana::metafunction<F>),
40 hana::tuple_t<F<x1>::type, F<x2>::type, F<x3>::type>
41 ));
42
43 BOOST_HANA_CONSTANT_CHECK(hana::equal(
44 hana::transform(hana::tuple_t<x1, x2, x3, x4>, hana::metafunction<F>),
45 hana::tuple_t<F<x1>::type, F<x2>::type, F<x3>::type, F<x4>::type>
46 ));
47
48 BOOST_HANA_CONSTANT_CHECK(hana::equal(
49 hana::transform(hana::tuple_t<x1, x2, x3, x4>, hana::template_<F>),
50 hana::tuple_t<F<x1>, F<x2>, F<x3>, F<x4>>
51 ));
52}
53

source code of boost/libs/hana/test/tuple/special.transform.cpp