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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/fold_right.hpp> | |
7 | #include <boost/hana/tuple.hpp> | |
8 | ||
9 | #include <sstream> | |
10 | #include <string> | |
11 | namespace hana = boost::hana; | |
12 | ||
13 | ||
14 | auto to_string = [](auto x) { | |
15 | std::ostringstream ss; | |
16 | ss << x; | |
17 | return ss.str(); | |
18 | }; | |
19 | ||
20 | int main() { | |
21 | auto f = [=](auto element, std::string s) { | |
22 | return "f(" + to_string(element) + ", " + s + ")"; | |
23 | }; | |
24 | ||
25 | // with an initial state | |
26 | BOOST_HANA_RUNTIME_CHECK( | |
27 | hana::fold_right(hana::make_tuple(1, '2', 3.0, 4), "5", f) | |
28 | == | |
29 | "f(1, f(2, f(3, f(4, 5))))" | |
30 | ); | |
31 | ||
32 | // without initial state | |
33 | BOOST_HANA_RUNTIME_CHECK( | |
34 | hana::fold_right(hana::make_tuple(1, '2', 3.0, 4, "5"), f) | |
35 | == | |
36 | "f(1, f(2, f(3, f(4, 5))))" | |
37 | ); | |
38 | } |