| cpp_redis 4.0.0 cpp_redis is a C++11 Asynchronous Multi-Platform Lightweight Redis Client, with support for synchronous operations and pipelining.

variadic_template.hpp
1 // The MIT License (MIT)
2 //
3 // Copyright (c) 2015-2017 Simon Ninon <simon.ninon@gmail.com>
4 //
5 // Permission is hereby granted, free of charge, to any person obtaining a copy
6 // of this software and associated documentation files (the "Software"), to deal
7 // in the Software without restriction, including without limitation the rights
8 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 // copies of the Software, and to permit persons to whom the Software is
10 // furnished to do so, subject to the following conditions:
11 //
12 // The above copyright notice and this permission notice shall be included in all
13 // copies or substantial portions of the Software.
14 //
15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 // SOFTWARE.
22
23 #pragma once
24
25 #include <type_traits>
26
27 namespace cpp_redis {
28 namespace helpers {
29
33 template <typename T, typename... Args>
34 struct back {
38 using type = typename back<Args...>::type;
39 };
40
44 template <typename T>
45 struct back<T> {
49 using type = T;
50 };
51
55 template <typename T, typename... Ts>
56 struct front {
60 using type = T;
61 };
62
66 template <typename T1, typename T2, typename... Ts>
67 struct is_type_present {
72 static constexpr bool value = std::is_same<T1, T2>::value
73 ? true
74 : is_type_present<T1, Ts...>::value;
75 };
76
80 template <typename T1, typename T2>
81 struct is_type_present<T1, T2> {
86 static constexpr bool value = std::is_same<T1, T2>::value;
87 };
88
92 template <typename T, typename... Args>
93 struct is_different_types {
98 static constexpr bool value = is_type_present<T, Args...>::value
99 ? false
100 : is_different_types<Args...>::value;
101 };
102
106 template <typename T1>
107 struct is_different_types<T1> {
111 static constexpr bool value = true;
112 };
113
114 } // namespace helpers
115
116 } // namespace cpp_redis
cpp_redis::helpers::is_type_present
Definition: variadic_template.hpp:67
cpp_redis::helpers::front::type
T type
Definition: variadic_template.hpp:60
cpp_redis::helpers::back< T >::type
T type
Definition: variadic_template.hpp:49
cpp_redis::helpers::front
Definition: variadic_template.hpp:56
cpp_redis::helpers::is_different_types
Definition: variadic_template.hpp:93
cpp_redis::helpers::back
Definition: variadic_template.hpp:34
cpp_redis::helpers::back::type
typename back< Args... >::type type
Definition: variadic_template.hpp:38
cpp_redis
Definition: array_builder.hpp:29