mirror of https://github.com/aria2/aria2
105 lines
2.6 KiB
C++
105 lines
2.6 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2006 Tatsuhiro Tsujikawa
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#ifndef D_SEQUENCE_H
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#define D_SEQUENCE_H
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#include <vector>
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namespace aria2 {
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template<typename T>
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class Sequence
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{
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public:
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// Generates value in [first_, last_). last_ is not included.
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class Value {
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private:
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T first_;
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T last_;
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public:
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Value(const T& first, const T& last):first_(first), last_(last) {}
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T next()
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{
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return first_++;
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}
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bool hasNext() const
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{
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return first_ != last_;
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}
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};
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typedef std::vector<Value> Values;
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private:
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Values values_;
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typename Values::iterator cur_;
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public:
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Sequence(const Values& values):
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values_(values), cur_(values_.begin()) {}
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Sequence():cur_(values_.end()) {}
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T next()
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{
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if(cur_ == values_.end()) {
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return T();
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}
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T t = (*cur_).next();
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if(!(*cur_).hasNext()) {
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++cur_;
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}
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return t;
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}
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bool hasNext()
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{
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return cur_ != values_.end();
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}
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std::vector<T> flush()
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{
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std::vector<T> r;
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while(hasNext()) {
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r.push_back(next());
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}
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return r;
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}
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};
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} // namespace aria2
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#endif // D_SEQUENCE_H
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