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1e59de90 | 1 | // Copyright 2016-2022 Antony Polukhin |
20effc67 TL |
2 | |
3 | // Distributed under the Boost Software License, Version 1.0. | |
4 | // (See the accompanying file LICENSE_1_0.txt | |
5 | // or a copy at <http://www.boost.org/LICENSE_1_0.txt>.) | |
6 | ||
7 | //[pfr_example_get | |
8 | /*` | |
9 | The following example shows how to access structure fields by index using [funcref boost::pfr::get]. | |
10 | ||
11 | Let's define some structure: | |
12 | */ | |
13 | #include <boost/pfr/core.hpp> | |
14 | ||
15 | struct foo { // defining structure | |
16 | int some_integer; | |
17 | char c; | |
18 | }; | |
19 | ||
20 | /*` | |
21 | We can access fields of that structure by index: | |
22 | */ | |
23 | foo f {777, '!'}; | |
24 | auto& r1 = boost::pfr::get<0>(f); // accessing field with index 0, returns reference to `foo::some_integer` | |
25 | auto& r2 = boost::pfr::get<1>(f); // accessing field with index 1, returns reference to `foo::c` | |
26 | //] [/pfr_example_get] | |
27 | ||
28 | ||
29 | int main() { | |
30 | if (r1 != 777) return 1; | |
31 | if (r2 != '!') return 2; | |
32 | ||
33 | r1 = 42; | |
34 | r2 = 'A'; | |
35 | ||
36 | if (r1 != 42) return 3; | |
37 | if (r2 != 'A') return 4; | |
38 | if (f.some_integer != 42) return 5; | |
39 | if (f.c != 'A') return 6; | |
40 | ||
41 | return 0; | |
42 | } |