66 lines
1.6 KiB
C++
66 lines
1.6 KiB
C++
/*
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* Copyright (c) 2013 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* sortix/kernel/yielder.h
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* Template that allows creation of easily-iterable sequences.
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*/
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#ifndef _INCLUDE_SORTIX_KERNEL_YIELDER_H
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#define _INCLUDE_SORTIX_KERNEL_YIELDER_H
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namespace Sortix {
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class finished_yielder { };
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template <class yielder_type, class yielded_type> class yielder_iterator
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{
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public:
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yielder_iterator(yielder_type yielder) : yielder_object(yielder)
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{
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has_value = yielder_object.yield(¤t_value);
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}
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bool is_finished() const
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{
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return !has_value;
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}
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bool operator!=(const yielder_iterator& other) const
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{
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return !(is_finished() && other.is_finished());
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}
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yielded_type operator*()
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{
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return current_value;
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}
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const yielder_iterator& operator++()
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{
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has_value = yielder_object.yield(¤t_value);
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return *this;
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}
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private:
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yielder_type yielder_object;
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yielded_type current_value;
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bool has_value;
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};
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} // namespace Sortix
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#endif
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