1 /*
2 // Copyright (c) 2018 Intel Corporation
3 //
4 // Licensed under the Apache License, Version 2.0 (the "License");
5 // you may not use this file except in compliance with the License.
6 // You may obtain a copy of the License at
7 //
8 //      http://www.apache.org/licenses/LICENSE-2.0
9 //
10 // Unless required by applicable law or agreed to in writing, software
11 // distributed under the License is distributed on an "AS IS" BASIS,
12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 // See the License for the specific language governing permissions and
14 // limitations under the License.
15 */
16 
17 #pragma once
18 #include <sdbusplus/message.hpp>
19 
20 #include <tuple>
21 
22 namespace sdbusplus
23 {
24 namespace utility
25 {
26 
27 namespace detail
28 {
29 template <class F, size_t... Is>
30 constexpr auto index_apply_impl(F f, std::index_sequence<Is...>)
31 {
32     return f(std::integral_constant<size_t, Is>{}...);
33 }
34 template <size_t N, class F>
35 constexpr auto index_apply(F f)
36 {
37     return index_apply_impl(f, std::make_index_sequence<N>{});
38 }
39 } // namespace detail
40 template <class Tuple>
41 constexpr bool read_into_tuple(Tuple& t, message_t& m)
42 {
43     return detail::index_apply<std::tuple_size<Tuple>{}>([&](auto... Is) {
44         if (m.is_method_error())
45         {
46             return false;
47         }
48         m.read(std::get<Is>(t)...);
49         return true;
50     });
51 }
52 } // namespace utility
53 } // namespace sdbusplus
54