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/at.hpp>
7#include <boost/hana/equal.hpp>
8#include <boost/hana/integral_constant.hpp>
9#include <boost/hana/string.hpp>
10namespace hana = boost::hana;
11
12
13int main() {
14 BOOST_HANA_CONSTANT_CHECK(hana::equal(
15 BOOST_HANA_STRING("abcd")[hana::size_c<2>],
16 hana::char_c<'c'>
17 ));
18
19 BOOST_HANA_CONSTANT_CHECK(hana::equal(
20 hana::at(BOOST_HANA_STRING("a"), hana::size_c<0>),
21 hana::char_c<'a'>
22 ));
23 BOOST_HANA_CONSTANT_CHECK(hana::equal(
24 hana::at(BOOST_HANA_STRING("ab"), hana::size_c<0>),
25 hana::char_c<'a'>
26 ));
27 BOOST_HANA_CONSTANT_CHECK(hana::equal(
28 hana::at(BOOST_HANA_STRING("abc"), hana::size_c<0>),
29 hana::char_c<'a'>
30 ));
31
32 BOOST_HANA_CONSTANT_CHECK(hana::equal(
33 hana::at(BOOST_HANA_STRING("ab"), hana::size_c<1>),
34 hana::char_c<'b'>
35 ));
36 BOOST_HANA_CONSTANT_CHECK(hana::equal(
37 hana::at(BOOST_HANA_STRING("abc"), hana::size_c<1>),
38 hana::char_c<'b'>
39 ));
40 BOOST_HANA_CONSTANT_CHECK(hana::equal(
41 hana::at(BOOST_HANA_STRING("abcd"), hana::size_c<1>),
42 hana::char_c<'b'>
43 ));
44
45 BOOST_HANA_CONSTANT_CHECK(hana::equal(
46 hana::at(BOOST_HANA_STRING("abc"), hana::size_c<2>),
47 hana::char_c<'c'>
48 ));
49 BOOST_HANA_CONSTANT_CHECK(hana::equal(
50 hana::at(BOOST_HANA_STRING("abcd"), hana::size_c<2>),
51 hana::char_c<'c'>
52 ));
53}
54

source code of boost/libs/hana/test/string/at.cpp