/usr/include/range/v3/view/unique.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_UNIQUE_HPP
#define RANGES_V3_VIEW_UNIQUE_HPP
#include <utility>
#include <meta/meta.hpp>
#include <range/v3/range_fwd.hpp>
#include <range/v3/utility/functional.hpp>
#include <range/v3/utility/static_const.hpp>
#include <range/v3/view/adjacent_filter.hpp>
#include <range/v3/view/view.hpp>
#include <range/v3/view/all.hpp>
namespace ranges
{
inline namespace v3
{
/// \addtogroup group-views
/// @{
namespace view
{
struct unique_fn
{
template<typename Rng>
using Concept = meta::and_<
ForwardRange<Rng>,
EqualityComparable<range_value_type_t<Rng>>>;
template<typename Rng, CONCEPT_REQUIRES_(Concept<Rng>())>
unique_view<all_t<Rng>> operator()(Rng && rng) const
{
return {all(static_cast<Rng&&>(rng)), not_equal_to{}};
}
#ifndef RANGES_DOXYGEN_INVOKED
template<typename Rng,
CONCEPT_REQUIRES_(!Concept<Rng>())>
void operator()(Rng &&) const
{
CONCEPT_ASSERT_MSG(ForwardRange<Rng>(),
"The object on which view::unique operates must be a model the "
"ForwardRange concept.");
CONCEPT_ASSERT_MSG(EqualityComparable<range_value_type_t<Rng>>(),
"The value type of the range passed to view::unique must be "
"EqualityComparable.");
}
#endif
};
/// \relates unique_fn
/// \ingroup group-views
RANGES_INLINE_VARIABLE(view<unique_fn>, unique)
}
/// @}
}
}
#endif
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