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/* ByUUID.h
Copyright (c) 2021 by Benjamin Hauch
Endless Sky 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.
Endless Sky 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
this program. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#include <memory>
template<class T>
class ByUUID {
public:
// Comparator for collections of shared_ptr<T>
bool operator()(const std::shared_ptr<T> &a, const std::shared_ptr<T> &b) const noexcept(false)
{
return a->UUID() < b->UUID();
}
// Comparator for collections of T*, e.g. set<T *>
bool operator()(const T *a, const T *b) const noexcept(false)
{
return a->UUID() < b->UUID();
}
// No comparator for collections of T, as std containers generally perform copy operations
// and copying this class will eventually be disabled.
};
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