/usr/include/range/v3/action/join.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_JOIN_HPP
#define RANGES_V3_ACTION_JOIN_HPP
#include <vector>
#include <functional>
#include <meta/meta.hpp>
#include <range/v3/range_fwd.hpp>
#include <range/v3/action/action.hpp>
#include <range/v3/action/concepts.hpp>
#include <range/v3/utility/functional.hpp>
#include <range/v3/utility/iterator_concepts.hpp>
#include <range/v3/utility/iterator_traits.hpp>
#include <range/v3/utility/static_const.hpp>
#include <range/v3/action/push_back.hpp>
namespace ranges
{
inline namespace v3
{
/// \addtogroup group-actions
/// @{
namespace action
{
struct join_fn
{
private:
template<typename Rng>
using join_value_t =
meta::if_c<
(bool) ranges::Container<range_value_type_t<Rng>>(),
range_value_type_t<Rng>,
std::vector<range_value_type_t<range_value_type_t<Rng>>>>;
struct Joinable_
{
template<typename Rng>
auto requires_() -> decltype(
concepts::valid_expr(
concepts::model_of<concepts::InputRange, Rng>(),
concepts::model_of<concepts::InputRange, range_value_type_t<Rng>>(),
concepts::model_of<concepts::SemiRegular, join_value_t<Rng>>()
));
};
public:
template<typename Rng>
using Joinable = concepts::models<Joinable_, Rng>;
template<typename Rng,
CONCEPT_REQUIRES_(Joinable<Rng>())>
join_value_t<Rng> operator()(Rng && rng) const
{
join_value_t<Rng> ret;
auto end = ranges::end(rng);
for(auto it = begin(rng); it != end; ++it)
push_back(ret, *it);
return ret;
}
#ifndef RANGES_DOXYGEN_INVOKED
template<typename Rng,
CONCEPT_REQUIRES_(!Joinable<Rng>())>
void operator()(Rng &&) const
{
CONCEPT_ASSERT_MSG(InputRange<Rng>(),
"The object on which action::join operates must be a model of the "
"InputRange concept.");
CONCEPT_ASSERT_MSG(InputRange<range_value_type_t<Rng>>(),
"The Range on which action::join operates must have a value type that "
"models the InputRange concept.");
}
#endif
};
/// \ingroup group-actions
/// \relates join_fn
/// \sa action
RANGES_INLINE_VARIABLE(action<join_fn>, join)
}
/// @}
}
}
#endif
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