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https://github.com/bolero-MURAKAMI/Sprout.git
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36 lines
1.1 KiB
C++
36 lines
1.1 KiB
C++
#ifndef SPROUT_ITERATOR_DISTANCE_HPP
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#define SPROUT_ITERATOR_DISTANCE_HPP
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#include <iterator>
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#include <sprout/config.hpp>
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#include <sprout/iterator/next.hpp>
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namespace sprout {
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namespace detail {
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// Copyright (C) 2011 RiSK (sscrisk)
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template<typename InputIterator>
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inline SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type
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distance(InputIterator first, InputIterator last) {
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return first == last ? 0
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: 1 + sprout::detail::distance(sprout::next(first), last)
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;
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}
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template<typename InputIterator>
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inline SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type
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distance_impl(InputIterator first, InputIterator last) {
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using sprout::detail::distance;
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return distance(first, last);
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}
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} // namespace detail
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//
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// distance
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//
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template<typename InputIterator>
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inline SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type
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distance(InputIterator first, InputIterator last) {
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return sprout::detail::distance_impl(first, last);
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_ITERATOR_DISTANCE_HPP
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