/usr/include/caf/detail/comparable.hpp is in libcaf-dev 0.13.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* ____ _ _____ *
* / ___| / \ | ___| C++ *
* | | / _ \ | |_ Actor *
* | |___ / ___ \| _| Framework *
* \____/_/ \_|_| *
* *
* Copyright (C) 2011 - 2015 *
* Dominik Charousset <dominik.charousset (at) haw-hamburg.de> *
* *
* Distributed under the terms and conditions of the BSD 3-Clause License or *
* (at your option) under the terms and conditions of the Boost Software *
* License 1.0. See accompanying files LICENSE and LICENSE_ALTERNATIVE. *
* *
* If you did not receive a copy of the license files, see *
* http://opensource.org/licenses/BSD-3-Clause and *
* http://www.boost.org/LICENSE_1_0.txt. *
******************************************************************************/
#ifndef CAF_COMPARABLE_HPP
#define CAF_COMPARABLE_HPP
namespace caf {
namespace detail {
/**
* Barton–Nackman trick implementation.
* `Subclass` must provide a compare member function that compares
* to instances of `T` and returns an integer x with:
* - `x < 0` if `*this < other`
* - `x > 0` if `*this > other`
* - `x == 0` if `*this == other`
*/
template <class Subclass, class T = Subclass>
class comparable {
friend bool operator==(const Subclass& lhs, const T& rhs) {
return lhs.compare(rhs) == 0;
}
friend bool operator==(const T& lhs, const Subclass& rhs) {
return rhs.compare(lhs) == 0;
}
friend bool operator!=(const Subclass& lhs, const T& rhs) {
return lhs.compare(rhs) != 0;
}
friend bool operator!=(const T& lhs, const Subclass& rhs) {
return rhs.compare(lhs) != 0;
}
friend bool operator<(const Subclass& lhs, const T& rhs) {
return lhs.compare(rhs) < 0;
}
friend bool operator>(const Subclass& lhs, const T& rhs) {
return lhs.compare(rhs) > 0;
}
friend bool operator<(const T& lhs, const Subclass& rhs) {
return rhs > lhs;
}
friend bool operator>(const T& lhs, const Subclass& rhs) {
return rhs < lhs;
}
friend bool operator<=(const Subclass& lhs, const T& rhs) {
return lhs.compare(rhs) <= 0;
}
friend bool operator>=(const Subclass& lhs, const T& rhs) {
return lhs.compare(rhs) >= 0;
}
friend bool operator<=(const T& lhs, const Subclass& rhs) {
return rhs >= lhs;
}
friend bool operator>=(const T& lhs, const Subclass& rhs) {
return rhs <= lhs;
}
};
template <class Subclass>
class comparable<Subclass, Subclass> {
friend bool operator==(const Subclass& lhs, const Subclass& rhs) {
return lhs.compare(rhs) == 0;
}
friend bool operator!=(const Subclass& lhs, const Subclass& rhs) {
return lhs.compare(rhs) != 0;
}
friend bool operator<(const Subclass& lhs, const Subclass& rhs) {
return lhs.compare(rhs) < 0;
}
friend bool operator<=(const Subclass& lhs, const Subclass& rhs) {
return lhs.compare(rhs) <= 0;
}
friend bool operator>(const Subclass& lhs, const Subclass& rhs) {
return lhs.compare(rhs) > 0;
}
friend bool operator>=(const Subclass& lhs, const Subclass& rhs) {
return lhs.compare(rhs) >= 0;
}
};
} // namespace details
} // namespace caf
#endif // CAF_COMPARABLE_HPP
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