/usr/include/range/v3/utility/infinity.hpp is in librange-v3-dev 0.3.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Range v3 library
//
// Copyright Eric Niebler 2014-present
//
// Use, modification and distribution is subject to the
// Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// Project home: https://github.com/ericniebler/range-v3
//
#ifndef RANGES_V3_UTILITY_INFINITY_HPP
#define RANGES_V3_UTILITY_INFINITY_HPP
#include <range/v3/range_fwd.hpp>
#include <range/v3/utility/concepts.hpp>
namespace ranges
{
inline namespace v3
{
/// \cond
struct infinity
{
};
constexpr bool operator==(infinity, infinity)
{
return true;
}
constexpr bool operator!=(infinity, infinity)
{
return false;
}
template<typename Integer,
CONCEPT_REQUIRES_(Integral<Integer>())>
constexpr bool operator==(Integer, infinity)
{
return false;
}
template<typename Integer,
CONCEPT_REQUIRES_(Integral<Integer>())>
constexpr bool operator==(infinity, Integer)
{
return false;
}
template<typename Integer,
CONCEPT_REQUIRES_(Integral<Integer>())>
constexpr bool operator!=(Integer, infinity)
{
return true;
}
template<typename Integer,
CONCEPT_REQUIRES_(Integral<Integer>())>
constexpr bool operator!=(infinity, Integer)
{
return true;
}
/// \endcond
}
}
#endif
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