/usr/include/osmium/utils/delta.hpp is in libosmium-dev 0.0~20140910-9a069af-1+b1.
This file is owned by root:root, with mode 0o644.
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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 | #ifndef OSMIUM_UTILS_DELTA_HPP
#define OSMIUM_UTILS_DELTA_HPP
/*
Copyright 2012 Jochen Topf <jochen@topf.org> and others (see README).
This file is part of Osmium (https://github.com/joto/osmium).
Osmium is free software: you can redistribute it and/or modify it under the
terms of the GNU Lesser General Public License or (at your option) the GNU
General Public License as published by the Free Software Foundation, either
version 3 of the Licenses, or (at your option) any later version.
Osmium 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 Lesser General Public License and the GNU
General Public License for more details.
You should have received a copy of the Licenses along with Osmium. If not, see
<http://www.gnu.org/licenses/>.
*/
#include <algorithm>
namespace Osmium {
/**
* This class models a variable that keeps track of the value
* it was last set to and returns the delta between old and
* new value from the update() call.
*/
template <typename T>
class Delta {
public:
Delta() :
m_value(0) {
}
void clear() {
m_value = 0;
}
T update(T new_value) {
std::swap(m_value, new_value);
return m_value - new_value;
}
private:
T m_value;
};
}
#endif // OSMIUM_UTILS_DELTA_HPP
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