/usr/include/range/v3/view/unbounded.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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// 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_VIEW_UNBOUNDED_HPP
#define RANGES_V3_VIEW_UNBOUNDED_HPP
#include <range/v3/detail/satisfy_boost_range.hpp>
#include <range/v3/range_fwd.hpp>
#include <range/v3/view_interface.hpp>
#include <range/v3/utility/unreachable.hpp>
#include <range/v3/utility/static_const.hpp>
namespace ranges
{
inline namespace v3
{
/// \addtogroup group-views
/// @{
template<typename I>
struct unbounded_view
: view_interface<unbounded_view<I>, infinite>
{
private:
I it_;
public:
constexpr explicit unbounded_view(I it)
: it_(detail::move(it))
{}
constexpr I begin() const
{
return it_;
}
constexpr unreachable end() const
{
return {};
}
};
namespace view
{
struct unbounded_fn
{
template<typename I>
constexpr unbounded_view<I> operator()(I it) const
{
CONCEPT_ASSERT(InputIterator<I>());
return unbounded_view<I>{detail::move(it)};
}
};
/// \relates unbounded_fn
/// \ingroup group-views
RANGES_INLINE_VARIABLE(unbounded_fn, unbounded)
}
/// @}
}
}
RANGES_SATISFY_BOOST_RANGE(::ranges::v3::unbounded_view)
#endif
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