/usr/include/range/v3/view/empty.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_VIEW_EMPTY_HPP
#define RANGES_V3_VIEW_EMPTY_HPP
#include <range/v3/detail/satisfy_boost_range.hpp>
#include <range/v3/range_fwd.hpp>
#include <range/v3/view_facade.hpp>
namespace ranges
{
inline namespace v3
{
template<typename T>
struct empty_view
: view_facade<empty_view<T>, (cardinality)0>
{
private:
friend range_access;
struct cursor
{
[[noreturn]] T const & read() const
{
RANGES_ENSURE(false);
}
constexpr bool equal(default_sentinel) const
{
return true;
}
constexpr bool equal(cursor const &) const
{
return true;
}
[[noreturn]] void next()
{
RANGES_ENSURE(false);
}
[[noreturn]] void prev()
{
RANGES_ENSURE(false);
}
void advance(std::ptrdiff_t n)
{
RANGES_EXPECT(n == 0);
}
std::ptrdiff_t distance_to(cursor const &) const
{
return 0;
}
};
cursor begin_cursor() const
{
return {};
}
cursor end_cursor() const
{
return {};
}
public:
empty_view() = default;
constexpr std::size_t size() const
{
return 0u;
}
constexpr T const *data() const
{
return nullptr;
}
};
namespace view
{
template<typename T>
empty_view<T> empty()
{
return {};
}
}
}
}
RANGES_SATISFY_BOOST_RANGE(::ranges::v3::empty_view)
#endif
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