/usr/include/range/v3/action/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_ACTION_UNIQUE_HPP
#define RANGES_V3_ACTION_UNIQUE_HPP
#include <range/v3/range_fwd.hpp>
#include <range/v3/range_traits.hpp>
#include <range/v3/action/action.hpp>
#include <range/v3/action/erase.hpp>
#include <range/v3/algorithm/unique.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
{
struct unique_fn
{
private:
friend action_access;
template<typename C, typename P = ident, CONCEPT_REQUIRES_(!Range<C>())>
static auto bind(unique_fn unique, C pred, P proj = P{})
RANGES_DECLTYPE_AUTO_RETURN
(
std::bind(unique, std::placeholders::_1, protect(std::move(pred)),
protect(std::move(proj)))
)
public:
struct ConceptImpl
{
template<typename Rng, typename C = equal_to, typename P = ident,
typename I = iterator_t<Rng>,
typename S = sentinel_t<Rng>>
auto requires_() -> decltype(
concepts::valid_expr(
concepts::model_of<concepts::ForwardRange, Rng>(),
concepts::model_of<concepts::ErasableRange, Rng, I, S>(),
concepts::is_true(Sortable<I, C, P>())
));
};
template<typename Rng, typename C = equal_to, typename P = ident>
using Concept = concepts::models<ConceptImpl, Rng, C, P>;
template<typename Rng, typename C = equal_to, typename P = ident,
typename I = iterator_t<Rng>,
CONCEPT_REQUIRES_(Concept<Rng, C, P>())>
Rng operator()(Rng && rng, C pred = C{}, P proj = P{}) const
{
I it = ranges::unique(rng, std::move(pred), std::move(proj));
ranges::erase(rng, it, end(rng));
return static_cast<Rng&&>(rng);
}
#ifndef RANGES_DOXYGEN_INVOKED
template<typename Rng, typename C = equal_to, typename P = ident,
CONCEPT_REQUIRES_(!Concept<Rng, C, P>())>
void operator()(Rng &&, C && = C{}, P && = P{}) const
{
CONCEPT_ASSERT_MSG(ForwardRange<Rng>(),
"The object on which action::unique operates must be a model of the "
"ForwardRange concept.");
using I = iterator_t<Rng>;
using S = sentinel_t<Rng>;
CONCEPT_ASSERT_MSG(ErasableRange<Rng, I, S>(),
"The object on which action::unique operates must allow element "
"removal.");
CONCEPT_ASSERT_MSG(IndirectInvocable<P, I>(),
"The projection function must accept objects of the iterator's value type, "
"reference type, and common reference type.");
CONCEPT_ASSERT_MSG(IndirectRelation<C, projected<I, P>>(),
"The comparator passed to action::unique must accept objects returned "
"by the projection function, or of the range's value type if no projection "
"is specified.");
CONCEPT_ASSERT_MSG(Permutable<I>(),
"The iterator type of the range passed to action::unique 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 unique_fn
/// \sa action
RANGES_INLINE_VARIABLE(action<unique_fn>, unique)
}
/// @}
}
}
#endif
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