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author | 2016-02-15 21:45:34 -0800 | |
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committer | 2016-02-16 22:47:55 -0800 | |
commit | 0161a0f68496682d03c408c5e8c620b620a31611 (patch) | |
tree | 87c4325a4c0bda38356c3d814183f6d89d70fb92 | |
parent | e42d5ffe29b4cd6cf9bac0f36fe37ec5001dfd68 (diff) | |
download | paludis-0161a0f68496682d03c408c5e8c620b620a31611.tar.gz paludis-0161a0f68496682d03c408c5e8c620b620a31611.tar.xz |
util: add IteratorRange utility
This is a utility class meant to provide a helper which permits returning a
range for iteration via a named pair of iterators. It serves as an adapter
for creating a C++11 friendly interface for iteration.
-rw-r--r-- | paludis/util/files.m4 | 1 | ||||
-rw-r--r-- | paludis/util/iterator_range.hh | 78 |
2 files changed, 79 insertions, 0 deletions
diff --git a/paludis/util/files.m4 b/paludis/util/files.m4 index dadcfcab3..4b02b30c8 100644 --- a/paludis/util/files.m4 +++ b/paludis/util/files.m4 @@ -42,6 +42,7 @@ add(`fs_stat', `hh', `cc', `fwd', `gtest', `testscript add(`graph', `hh', `cc', `fwd', `impl', `gtest') add(`hashes', `hh', `cc', `gtest') add(`iterator_funcs', `hh', `gtest') +add(`iterator_range', `hh') add(`indirect_iterator', `hh', `fwd', `impl', `gtest') add(`is_file_with_extension', `hh', `cc', `se', `gtest', `testscript') add(`join', `hh', `gtest') diff --git a/paludis/util/iterator_range.hh b/paludis/util/iterator_range.hh new file mode 100644 index 000000000..c3ea12d67 --- /dev/null +++ b/paludis/util/iterator_range.hh @@ -0,0 +1,78 @@ +/* vim: set sw=4 sts=4 et foldmethod=syntax : */ +/* + * Copyright (c) 2014 Saleem Abdulrasool + * + * This file is part of the Paludis package manager. Paludis is free software; + * you can redistribute it and/or modify it under the terms of the GNU General + * Public License version 2, as published by the Free Software Foundation. + * + * Paludis is distributed in the hope that it will be useful, but WITHOUT ANY + * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS + * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more + * details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 Temple + * Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef PALUDIS_GUARD_PALUDIS_UTIL_ITERATOR_RANGE_HH +#define PALUDIS_GUARD_PALUDIS_UTIL_ITERATOR_RANGE_HH 1 + +#include <iterator> +#include <utility> + +namespace paludis +{ + template <typename Iterator_> + class IteratorRange + { + private: + Iterator_ _begin, _end; + + public: + // TODO(compnerd) use SFINAE to ensure that the container's + // iterators match the range's iterator + template <typename Container_> + IteratorRange(Container_ && container) + : _begin(std::begin(container)), _end(std::end(container)) + { + } + + IteratorRange(Iterator_ begin, Iterator_ end) + : _begin(std::move(begin)), _end(std::move(end)) + { + } + + Iterator_ begin() const + { + return _begin; + } + + Iterator_ end() const + { + return _end; + } + + size_t size() const + { + return std::distance(_end, _begin); + } + }; + + template <typename Iterator_> + IteratorRange<Iterator_> make_range(Iterator_ begin, Iterator_ end) + { + return IteratorRange<Iterator_>(std::move(begin), std::move(end)); + } + + template <typename Iterator_> + IteratorRange<Iterator_> make_range(std::pair<Iterator_, Iterator_> range) + { + return IteratorRange<Iterator_>(std::move(range.first), + std::move(range.second)); + } +} + +#endif + |