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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/at_key.hpp> | |
7 | #include <boost/hana/integral_constant.hpp> | |
8 | #include <boost/hana/map.hpp> | |
9 | #include <boost/hana/pair.hpp> | |
10 | ||
11 | #include <utility> | |
12 | namespace hana = boost::hana; | |
13 | ||
14 | ||
15 | template <typename T> | |
16 | T const& cref(T& t) { return t; } | |
17 | ||
18 | int main() { | |
19 | // using at_key | |
20 | { | |
21 | auto xs = hana::make_map( | |
22 | hana::make_pair(hana::int_c<0>, 0), | |
23 | hana::make_pair(hana::int_c<1>, '1'), | |
24 | hana::make_pair(hana::int_c<2>, 2.2) | |
25 | ); | |
26 | ||
27 | // Make sure we return lvalue-references | |
28 | BOOST_HANA_RUNTIME_CHECK(hana::at_key(xs, hana::int_c<0>) == 0); | |
29 | BOOST_HANA_RUNTIME_CHECK(hana::at_key(xs, hana::int_c<1>) == '1'); | |
30 | BOOST_HANA_RUNTIME_CHECK(hana::at_key(xs, hana::int_c<2>) == 2.2); | |
31 | ||
32 | int& a = hana::at_key(xs, hana::int_c<0>); | |
33 | char& b = hana::at_key(xs, hana::int_c<1>); | |
34 | double& c = hana::at_key(xs, hana::int_c<2>); | |
35 | a = 9; | |
36 | b = '9'; | |
37 | c = 9.9; | |
38 | ||
39 | // Make sure we return lvalue-references to const on a const map | |
40 | int const& ca = hana::at_key(cref(xs), hana::int_c<0>); | |
41 | char const& cb = hana::at_key(cref(xs), hana::int_c<1>); | |
42 | double const& cc = hana::at_key(cref(xs), hana::int_c<2>); | |
43 | ||
44 | BOOST_HANA_RUNTIME_CHECK(ca == 9); | |
45 | BOOST_HANA_RUNTIME_CHECK(cb == '9'); | |
46 | BOOST_HANA_RUNTIME_CHECK(cc == 9.9); | |
47 | } | |
48 | ||
49 | // using operator[] | |
50 | { | |
51 | auto xs = hana::make_map( | |
52 | hana::make_pair(hana::int_c<0>, 0), | |
53 | hana::make_pair(hana::int_c<1>, '1'), | |
54 | hana::make_pair(hana::int_c<2>, 2.2) | |
55 | ); | |
56 | ||
57 | BOOST_HANA_RUNTIME_CHECK(xs[hana::int_c<0>] == 0); | |
58 | BOOST_HANA_RUNTIME_CHECK(xs[hana::int_c<1>] == '1'); | |
59 | BOOST_HANA_RUNTIME_CHECK(xs[hana::int_c<2>] == 2.2); | |
60 | ||
61 | xs[hana::int_c<0>] = 9; | |
62 | xs[hana::int_c<1>] = '9'; | |
63 | xs[hana::int_c<2>] = 9.9; | |
64 | ||
65 | BOOST_HANA_RUNTIME_CHECK(xs[hana::int_c<0>] == 9); | |
66 | BOOST_HANA_RUNTIME_CHECK(xs[hana::int_c<1>] == '9'); | |
67 | BOOST_HANA_RUNTIME_CHECK(xs[hana::int_c<2>] == 9.9); | |
68 | } | |
69 | ||
70 | // Make sure we return a rvalue-reference from a temporary map | |
71 | // (https://github.com/boostorg/hana/issues/90) | |
72 | { | |
73 | auto xs = hana::make_map( | |
74 | hana::make_pair(hana::int_c<0>, 0), | |
75 | hana::make_pair(hana::int_c<1>, '1'), | |
76 | hana::make_pair(hana::int_c<2>, 2.2) | |
77 | ); | |
78 | ||
79 | char&& c = hana::at_key(std::move(xs), hana::int_c<1>); | |
80 | BOOST_HANA_RUNTIME_CHECK(hana::at_key(xs, hana::int_c<1>) == '1'); | |
81 | c = '9'; | |
82 | BOOST_HANA_RUNTIME_CHECK(hana::at_key(xs, hana::int_c<1>) == '9'); | |
83 | } | |
84 | } |