/usr/include/range/v3/action/reverse.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
// Copyright Gonzalo Brito Gadeschi 2017
//
// 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_ACTION_REVERSE_HPP
#define RANGES_V3_ACTION_REVERSE_HPP
#include <range/v3/range_fwd.hpp>
#include <range/v3/range_traits.hpp>
#include <range/v3/action/action.hpp>
#include <range/v3/algorithm/reverse.hpp>
#include <range/v3/utility/iterator_concepts.hpp>
#include <range/v3/utility/static_const.hpp>
namespace ranges
{
inline namespace v3
{
/// \addtogroup group-actions
/// @{
namespace action
{
/// Reversed the source range in-place.
struct reverse_fn
{
private:
friend action_access;
struct Reversible_
{
template<typename Rng>
auto requires_() -> decltype(
concepts::valid_expr(
concepts::model_of<concepts::BidirectionalRange, Rng>(),
concepts::is_true(Permutable<iterator_t<Rng>>())
));
};
public:
template<typename Rng>
using Reversible = concepts::models<Reversible_, Rng>;
template<typename Rng,
CONCEPT_REQUIRES_(Reversible<Rng>())>
Rng operator()(Rng && rng) const
{
ranges::reverse(rng);
return static_cast<Rng&&>(rng);
}
#ifndef RANGES_DOXYGEN_INVOKED
template<typename Rng,
CONCEPT_REQUIRES_(!Reversible<Rng>())>
void operator()(Rng &&) const
{
CONCEPT_ASSERT_MSG(BidirectionalRange<Rng>(),
"The object on which action::reverse operates must be a model of the "
"BidirectionalRange concept.");
CONCEPT_ASSERT_MSG(Permutable<iterator_t<Rng>>(),
"The iterator type of the range passed to action::reverse must allow its "
"elements to be permuted; that is, the values must be movable and the "
"iterator must be mutable.");
}
#endif
};
/// \ingroup group-actions
/// \relates reverse_fn
/// \sa action
RANGES_INLINE_VARIABLE(action<reverse_fn>, reverse)
}
/// @}
}
}
#endif
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