/usr/include/range/v3/view/tail.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_TAIL_HPP
#define RANGES_V3_VIEW_TAIL_HPP
#include <utility>
#include <type_traits>
#include <range/v3/detail/satisfy_boost_range.hpp>
#include <range/v3/range_fwd.hpp>
#include <range/v3/begin_end.hpp>
#include <range/v3/empty.hpp>
#include <range/v3/size.hpp>
#include <range/v3/range_traits.hpp>
#include <range/v3/range_concepts.hpp>
#include <range/v3/view_interface.hpp>
#include <range/v3/utility/iterator.hpp>
#include <range/v3/utility/static_const.hpp>
#include <range/v3/view/all.hpp>
#include <range/v3/view/view.hpp>
namespace ranges
{
inline namespace v3
{
namespace detail
{
template<typename T>
constexpr T prev_or_zero_(T n)
{
return n == 0 ? T(0) : T(n - 1);
}
}
/// \addtogroup group-views
/// @{
template<typename Rng>
struct tail_view
: view_interface<
tail_view<Rng>,
(range_cardinality<Rng>::value >= 0)
? detail::prev_or_zero_(range_cardinality<Rng>::value)
: range_cardinality<Rng>::value>
{
private:
Rng rng_;
using size_type_ = range_size_type_t<Rng>;
public:
using iterator = iterator_t<Rng>;
using sentinel = sentinel_t<Rng>;
tail_view() = default;
tail_view(Rng rng)
: rng_(static_cast<Rng&&>(rng))
{
CONCEPT_ASSERT(InputRange<Rng>());
}
iterator begin()
{
return next(ranges::begin(rng_), 1, ranges::end(rng_));
}
CONCEPT_REQUIRES(Range<Rng const>())
iterator begin() const
{
return next(ranges::begin(rng_), 1, ranges::end(rng_));
}
sentinel end()
{
return ranges::end(rng_);
}
CONCEPT_REQUIRES(Range<Rng const>())
sentinel end() const
{
return ranges::end(rng_);
}
CONCEPT_REQUIRES(SizedView<Rng>())
constexpr size_type_ size() const
{
return range_cardinality<Rng>::value >= 0
? detail::prev_or_zero_((size_type_)range_cardinality<Rng>::value)
: detail::prev_or_zero_(ranges::size(rng_));
}
Rng & base()
{
return rng_;
}
Rng const & base() const
{
return rng_;
}
};
namespace view
{
struct tail_fn
{
template<typename Rng, CONCEPT_REQUIRES_(InputRange<Rng>())>
meta::if_c<range_cardinality<Rng>::value == 0, all_t<Rng>, tail_view<all_t<Rng>>>
operator()(Rng && rng) const
{
return all(static_cast<Rng&&>(rng));
}
#ifndef RANGES_DOXYGEN_INVOKED
template<typename Rng, CONCEPT_REQUIRES_(!InputRange<Rng>())>
void operator()(Rng &&) const
{
CONCEPT_ASSERT_MSG(InputRange<Rng>(),
"The object on which view::tail is to operate must be a model of the "
"InputRange concept.");
}
#endif
};
/// \relates tail_fn
/// \ingroup group-views
RANGES_INLINE_VARIABLE(view<tail_fn>, tail)
}
/// @}
}
}
RANGES_SATISFY_BOOST_RANGE(::ranges::v3::tail_view)
#endif
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