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numeric_properties.hpp
1 // The MIT License (MIT)
2 
3 // Copyright (c) 2012-2014 Danny Y., Rapptz
4 
5 // Permission is hereby granted, free of charge, to any person obtaining a copy of
6 // this software and associated documentation files (the "Software"), to deal in
7 // the Software without restriction, including without limitation the rights to
8 // use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
9 // the Software, and to permit persons to whom the Software is furnished to do so,
10 // 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, FITNESS
17 // FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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21 
22 #ifndef GEARS_FUNCTIONAL_NUMERICAL_PROPERTIES_HPP
23 #define GEARS_FUNCTIONAL_NUMERICAL_PROPERTIES_HPP
24 
25 #include <utility>
26 
27 namespace gears {
28 namespace functional {
29 struct even_type {
30  template<typename T>
31  constexpr auto operator()(T&& t) const -> decltype(std::forward<T>(t) % 2 == 0) {
32  return std::forward<T>(t) % 2 == 0;
33  }
34 };
35 
36 struct odd_type {
37  template<typename T>
38  constexpr auto operator()(T&& t) const -> decltype(std::forward<T>(t) % 2 != 0) {
39  return std::forward<T>(t) % 2 != 0;
40  }
41 };
42 
53 constexpr even_type even{};
54 
65 constexpr odd_type odd{};
66 } // functional
67 } // gears
68 
69 #endif // GEARS_FUNCTIONAL_NUMERICAL_PROPERTIES_HPP