├── README.md
├── LICENSE
└── enumerate.hpp


/README.md:
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1 | # enumerate
2 | Range-based for loop with indices retained
3 | 
4 | Purpose and usage: https://blog.therocode.net/2018/10/for-each-with-index
5 | 


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/LICENSE:
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 1 | MIT License
 2 | 
 3 | Copyright (c) 2018 Tobias Widlund
 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 | 


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/enumerate.hpp:
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 1 | /*
 2 |  * MIT License
 3 |  *
 4 |  * Copyright (c) 2018 Tobias Widlund
 5 |  *
 6 |  * Permission is hereby granted, free of charge, to any person obtaining a copy
 7 |  * of this software and associated documentation files (the "Software"), to deal
 8 |  * in the Software without restriction, including without limitation the rights
 9 |  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 |  * copies of the Software, and to permit persons to whom the Software is
11 |  * furnished to do so, subject to the following conditions:
12 |  *
13 |  * The above copyright notice and this permission notice shall be included in all
14 |  * copies or substantial portions of the Software.
15 |  *
16 |  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 |  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 |  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 |  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 |  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 |  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 |  * SOFTWARE.
23 |  */
24 | 
25 | #pragma once
26 | #include <type_traits>
27 | #include <cstddef>
28 | #include <utility>
29 | 
30 | namespace en
31 | {
32 | template <typename container_type>
33 | struct enumerate_wrapper
34 | {
35 |     using iterator_type = std::conditional_t<std::is_const_v<container_type>, typename container_type::const_iterator, typename container_type::iterator>;
36 |     using pointer_type = std::conditional_t<std::is_const_v<container_type>, typename container_type::const_pointer, typename container_type::pointer>;
37 |     using reference_type = std::conditional_t<std::is_const_v<container_type>, typename container_type::const_reference, typename container_type::reference>;
38 | 
39 |     constexpr enumerate_wrapper(container_type& c): container(c)
40 |     {
41 | 
42 |     }
43 | 
44 |     struct enumerate_wrapper_iter
45 |     {
46 |         size_t index;
47 |         iterator_type value;
48 | 
49 | 
50 |         constexpr bool operator!=(const iterator_type& other) const
51 |         {
52 |             return value != other;
53 |         }
54 |         constexpr enumerate_wrapper_iter& operator++()
55 |         {
56 |             ++index;
57 |             ++value;
58 |             return *this;
59 |         }
60 | 
61 |         constexpr std::pair<size_t, reference_type> operator*() {
62 |             return std::pair<size_t, reference_type>{index, *value};
63 |         }
64 |     };
65 | 
66 |     constexpr enumerate_wrapper_iter begin()
67 |     {
68 |         return {0, std::begin(container)};
69 |     }
70 | 
71 |     constexpr iterator_type end()
72 |     {
73 |         return std::end(container);
74 |     }
75 |     container_type& container;
76 | };
77 | 
78 | template <typename container_type>
79 | constexpr auto enumerate(container_type& c)
80 | {
81 |     return enumerate_wrapper(c);
82 | }
83 | 
84 | template <typename container_type>
85 | constexpr auto const_enumerate(const container_type& c)
86 | {
87 |     return enumerate_wrapper(c);
88 | }
89 | }
90 | 


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