/usr/include/jellyfish/stream_iterator.hpp is in libjellyfish-2.0-dev 2.2.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 | /* This file is part of Jellyfish.
Jellyfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Jellyfish 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 Jellyfish. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __STREAM_ITERATOR_HPP__
#define __STREAM_ITERATOR_HPP__
#include <assert.h>
#include <iostream>
#include <fstream>
#include <iterator>
#include <stdexcept>
#include <memory>
#include <jellyfish/err.hpp>
namespace jellyfish {
/// Transform an iterator of paths (c string: const char*) into an
/// iterator of std::ifstream. Every file is opened and closed in
/// turn. The object instantiated with no argument is the end marker.
template<typename PathIterator>
class stream_iterator : public std::iterator<std::forward_iterator_tag, std::ifstream> {
PathIterator begin_, end_;
std::ifstream* stream_;
public:
stream_iterator(PathIterator begin, PathIterator end) :
begin_(begin), end_(end), stream_(0)
{
if(begin_ != end_) {
stream_ = new std::ifstream;
open_file();
}
}
stream_iterator(const stream_iterator& rhs) :
begin_(rhs.begin_), end_(rhs.end_), stream_(rhs.stream_)
{ }
stream_iterator() : begin_(), end_(), stream_() { }
bool operator==(const stream_iterator& rhs) const {
return stream_ == rhs.stream_;
}
bool operator!=(const stream_iterator& rhs) const {
return stream_ != rhs.stream_;
}
std::ifstream& operator*() { return *stream_; }
std::ifstream* operator->() { return stream_; }
stream_iterator& operator++() {
stream_->close();
if(++begin_ != end_) {
open_file();
} else {
delete stream_;
stream_ = 0;
}
return *this;
}
stream_iterator operator++(int) {
stream_iterator res(*this);
++*this;
return res;
}
protected:
void open_file() {
stream_->open(*begin_);
if(stream_->fail())
throw std::runtime_error(err::msg() << "Failed to open file '" << *begin_ << "'");
}
};
}
#endif /* __STREAM_ITERATOR_HPP__ */
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