/usr/include/range/v3/view/indirect.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 2013-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_INDIRECT_HPP
#define RANGES_V3_VIEW_INDIRECT_HPP
#include <iterator>
#include <type_traits>
#include <utility>
#include <meta/meta.hpp>
#include <range/v3/begin_end.hpp>
#include <range/v3/range_fwd.hpp>
#include <range/v3/range_traits.hpp>
#include <range/v3/view_adaptor.hpp>
#include <range/v3/detail/satisfy_boost_range.hpp>
#include <range/v3/utility/move.hpp>
#include <range/v3/utility/static_const.hpp>
#include <range/v3/view/view.hpp>
namespace ranges
{
inline namespace v3
{
/// \addtogroup group-views
/// @{
template<typename Rng>
struct indirect_view
: view_adaptor<indirect_view<Rng>, Rng>
{
private:
friend range_access;
struct adaptor
: adaptor_base
{
constexpr auto read(iterator_t<Rng> const &it) const
RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT
(
**it
)
constexpr auto iter_move(iterator_t<Rng> const &it) const
RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT
(
ranges::iter_move(*it)
)
};
constexpr adaptor begin_adaptor() const noexcept
{
return {};
}
constexpr adaptor end_adaptor() const noexcept
{
return {};
}
public:
indirect_view() = default;
explicit constexpr indirect_view(Rng rng)
noexcept(std::is_nothrow_constructible<
typename indirect_view::view_adaptor, Rng>::value)
: indirect_view::view_adaptor{detail::move(rng)}
{}
CONCEPT_REQUIRES(SizedRange<Rng const>())
constexpr range_size_type_t<Rng> size() const
noexcept(noexcept(ranges::size(std::declval<Rng const &>())))
{
return ranges::size(this->base());
}
CONCEPT_REQUIRES(!SizedRange<Rng const>() && SizedRange<Rng>())
RANGES_CXX14_CONSTEXPR range_size_type_t<Rng> size()
noexcept(noexcept(ranges::size(std::declval<Rng &>())))
{
return ranges::size(this->base());
}
};
namespace view
{
struct indirect_fn
{
template<typename Rng>
using Constraint = meta::and_<
InputRange<Rng>,
Readable<range_value_type_t<Rng>>>;
template<typename Rng,
CONCEPT_REQUIRES_(Constraint<Rng>())>
constexpr auto operator()(Rng &&rng) const
RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT
(
indirect_view<all_t<Rng>>{all(static_cast<Rng &&>(rng))}
)
#ifndef RANGES_DOXYGEN_INVOKED
template<typename Rng,
CONCEPT_REQUIRES_(!Constraint<Rng>())>
void operator()(Rng &&) const
{
CONCEPT_ASSERT_MSG(InputRange<Rng>(),
"The argument to view::indirect must be a model of the InputRange "
"concept");
CONCEPT_ASSERT_MSG(Readable<range_value_type_t<Rng>>(),
"The value type of the range passed to view::indirect must be a model "
"of the Readable concept.");
}
#endif
};
/// \relates indirect_fn
/// \ingroup group-views
RANGES_INLINE_VARIABLE(view<indirect_fn>, indirect)
}
/// @}
}
}
RANGES_SATISFY_BOOST_RANGE(::ranges::v3::indirect_view)
#endif
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