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adl/iterator.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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20 // CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
21 
22 #ifndef GEARS_ADL_ITERATOR_HPP
23 #define GEARS_ADL_ITERATOR_HPP
24 
25 #include <iterator>
26 #include <utility>
27 
28 namespace gears {
29 namespace adl {
30 namespace detail {
31 using std::begin;
32 using std::end;
33 
34 template<typename T>
35 constexpr auto adl_begin(T&& t) -> decltype(begin(std::declval<T>())) {
36  return begin(std::forward<T>(t));
37 }
38 
39 template<typename T>
40 constexpr auto adl_end(T&& t) -> decltype(end(std::declval<T>())) {
41  return end(std::forward<T>(t));
42 }
43 } // detail
44 
60 template<typename T>
61 constexpr auto begin(T&& t) -> decltype(detail::adl_begin(std::declval<T>())) {
62  return detail::adl_begin(std::forward<T>(t));
63 }
64 
80 template<typename T>
81 constexpr auto end(T&& t) -> decltype(detail::adl_end(std::declval<T>())) {
82  return detail::adl_end(std::forward<T>(t));
83 }
84 } // adl
85 } // gears
86 
87 #endif // GEARS_ADL_ITERATOR_HPP