Embedded Template Library 1.0
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nth_type.h
1/******************************************************************************
2The MIT License(MIT)
3
4Embedded Template Library.
5https://github.com/ETLCPP/etl
6https://www.etlcpp.com
7
8Copyright(c) 2021 John Wellbelove
9
10Permission is hereby granted, free of charge, to any person obtaining a copy
11of this software and associated documentation files(the "Software"), to deal
12in the Software without restriction, including without limitation the rights
13to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
14copies of the Software, and to permit persons to whom the Software is
15furnished to do so, subject to the following conditions :
16
17The above copyright notice and this permission notice shall be included in all
18copies or substantial portions of the Software.
19
20THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
23AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
25OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
26SOFTWARE.
27******************************************************************************/
28
29#ifndef ETL_NTH_TYPE_INCLUDED
30#define ETL_NTH_TYPE_INCLUDED
31
32#include "platform.h"
33#include "static_assert.h"
34
35namespace etl
36{
37#if ETL_USING_CPP11
38
39 //***************************************************************************
41 //***************************************************************************
42 template <size_t N, typename... TTypes>
43 struct nth_type;
44
45 //***************************************************************************
47 //***************************************************************************
48 template <size_t N, typename T1, typename... TRest>
49 struct nth_type<N, T1, TRest...>
50 {
51 ETL_STATIC_ASSERT(N <= sizeof...(TRest), "etl::nth_type out of range for type list");
52
53 using type = typename nth_type<N - 1U, TRest...>::type;
54 };
55
56 //***************************************************************************
58 //***************************************************************************
59 template <typename T1, typename... TRest>
60 struct nth_type<0U, T1, TRest...>
61 {
62 using type = T1;
63 };
64
65 //***************************************************************************
67 //***************************************************************************
68 template <size_t N>
69 struct nth_type<N>
70 {
71 };
72
73 //***************************************************************************
75 //***************************************************************************
76 template <size_t N, typename... TTypes>
77 using nth_type_t = typename nth_type<N, TTypes...>::type;
78#endif
79}
80
81#endif
bitset_ext
Definition absolute.h:38
ETL_CONSTEXPR pair()
Default constructor.
Definition utility.h:176