1 #ifndef OSMIUM_UTIL_ITERATOR_HPP 2 #define OSMIUM_UTIL_ITERATOR_HPP 3 4 /* 5 6 This file is part of Osmium (https://osmcode.org/libosmium). 7 8 Copyright 2013-2021 Jochen Topf <jochen@topf.org> and others (see README). 9 10 Boost Software License - Version 1.0 - August 17th, 2003 11 12 Permission is hereby granted, free of charge, to any person or organization 13 obtaining a copy of the software and accompanying documentation covered by 14 this license (the "Software") to use, reproduce, display, distribute, 15 execute, and transmit the Software, and to prepare derivative works of the 16 Software, and to permit third-parties to whom the Software is furnished to 17 do so, all subject to the following: 18 19 The copyright notices in the Software and this entire statement, including 20 the above license grant, this restriction and the following disclaimer, 21 must be included in all copies of the Software, in whole or in part, and 22 all derivative works of the Software, unless such copies or derivative 23 works are solely in the form of machine-executable object code generated by 24 a source language processor. 25 26 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 27 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 28 FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT 29 SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE 30 FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, 31 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 32 DEALINGS IN THE SOFTWARE. 33 34 */ 35 36 #include <type_traits> 37 #include <utility> 38 39 namespace osmium { 40 41 template <typename It, typename P = std::pair<It, It>> 42 struct iterator_range : public P { 43 44 using iterator = It; 45 iterator_rangeosmium::iterator_range46 explicit iterator_range(P&& p) noexcept : 47 P(std::forward<P>(p)) { 48 } 49 beginosmium::iterator_range50 It begin() const noexcept { 51 return this->first; 52 } 53 endosmium::iterator_range54 It end() const noexcept { 55 return this->second; 56 } 57 emptyosmium::iterator_range58 bool empty() const noexcept { 59 return begin() == end(); 60 } 61 62 }; // struct iterator_range 63 64 /** 65 * Helper function to create iterator_range from std::pair. 66 */ 67 template <typename P, typename It = typename P::first_type> make_range(P && p)68 inline iterator_range<It> make_range(P&& p) noexcept { 69 static_assert(std::is_same<P, std::pair<It, It>>::value, "make_range needs pair of iterators as argument"); 70 return iterator_range<It>{std::forward<P>(p)}; 71 } 72 73 } // namespace osmium 74 75 #endif // OSMIUM_UTIL_ITERATOR_HPP 76