/usr/include/range/v3/view/bounded.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_BOUNDED_HPP
#define RANGES_V3_VIEW_BOUNDED_HPP
#include <type_traits>
#include <range/v3/begin_end.hpp>
#include <range/v3/iterator_range.hpp>
#include <range/v3/range_concepts.hpp>
#include <range/v3/range_fwd.hpp>
#include <range/v3/range_traits.hpp>
#include <range/v3/size.hpp>
#include <range/v3/view_interface.hpp>
#include <range/v3/detail/satisfy_boost_range.hpp>
#include <range/v3/utility/common_iterator.hpp>
#include <range/v3/utility/functional.hpp>
#include <range/v3/utility/iterator_concepts.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
{
/// \addtogroup group-views
/// @{
namespace detail
{
/// \cond
template<typename R>
using RA_and_Sized =
meta::strict_and<RandomAccessRange<R>, SizedRange<R>>;
template<typename R>
using bounded_iterator_t = meta::if_<RA_and_Sized<R>,
iterator_t<R>,
common_iterator_t<iterator_t<R>, sentinel_t<R>>>;
/// \endcond
}
template<typename Rng>
struct bounded_view
: view_interface<bounded_view<Rng>, range_cardinality<Rng>::value>
{
private:
CONCEPT_ASSERT(View<Rng>());
CONCEPT_ASSERT(!BoundedView<Rng>());
Rng rng_;
sentinel_t<Rng> end_(std::false_type)
{
return ranges::end(rng_);
}
iterator_t<Rng> end_(std::true_type)
{
return ranges::begin(rng_) + ranges::distance(rng_);
}
template<typename R = Rng const, CONCEPT_REQUIRES_(Range<R &>())>
sentinel_t<R> end_(std::false_type) const
{
return ranges::end(rng_);
}
template<typename R = Rng const, CONCEPT_REQUIRES_(Range<R &>())>
iterator_t<R> end_(std::true_type) const
{
return ranges::begin(rng_) + ranges::distance(rng_);
}
public:
bounded_view() = default;
explicit bounded_view(Rng rng)
: rng_(detail::move(rng))
{}
Rng & base()
{
return rng_;
}
Rng const & base() const
{
return rng_;
}
detail::bounded_iterator_t<Rng> begin()
{
return detail::bounded_iterator_t<Rng>{ranges::begin(rng_)};
}
detail::bounded_iterator_t<Rng> end()
{
return detail::bounded_iterator_t<Rng>{end_(detail::RA_and_Sized<Rng>{})};
}
CONCEPT_REQUIRES(SizedRange<Rng>())
range_size_type_t<Rng> size()
{
return ranges::size(rng_);
}
template<typename R = Rng const, CONCEPT_REQUIRES_(Range<R &>())>
detail::bounded_iterator_t<R> begin() const
{
return detail::bounded_iterator_t<R>{ranges::begin(rng_)};
}
template<typename R = Rng const, CONCEPT_REQUIRES_(Range<R &>())>
detail::bounded_iterator_t<R> end() const
{
return detail::bounded_iterator_t<R>{end_(detail::RA_and_Sized<R>{})};
}
CONCEPT_REQUIRES(SizedRange<Rng const>())
range_size_type_t<Rng> size() const
{
return ranges::size(rng_);
}
};
namespace view
{
struct bounded_fn
{
template<typename Rng,
CONCEPT_REQUIRES_(Range<Rng>() && !BoundedRange<Rng>())>
bounded_view<all_t<Rng>> operator()(Rng && rng) const
{
return bounded_view<all_t<Rng>>{all(static_cast<Rng&&>(rng))};
}
template<typename Rng,
CONCEPT_REQUIRES_(Range<Rng>() && BoundedRange<Rng>())>
all_t<Rng> operator()(Rng && rng) const
{
return all(static_cast<Rng&&>(rng));
}
#ifndef RANGES_DOXYGEN_INVOKED
template<typename Rng,
CONCEPT_REQUIRES_(!Range<Rng>())>
void operator()(Rng &&) const
{
CONCEPT_ASSERT_MSG(Range<Rng>(),
"Rng is not a model of the Range concept");
}
#endif
};
/// \relates bounded_fn
/// \ingroup group-views
RANGES_INLINE_VARIABLE(view<bounded_fn>, bounded)
template<typename Rng>
using bounded_t =
decltype(bounded(std::declval<Rng>()));
}
/// @}
}
}
RANGES_SATISFY_BOOST_RANGE(::ranges::v3::bounded_view)
#endif
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