/usr/include/range/v3/index.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 2014-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_INDEX_HPP
#define RANGES_V3_INDEX_HPP
#include <range/v3/range_fwd.hpp>
#include <range/v3/begin_end.hpp>
#include <range/v3/range_traits.hpp>
#include <range/v3/range_concepts.hpp>
#include <range/v3/distance.hpp>
#include <range/v3/utility/static_const.hpp>
namespace ranges
{
inline namespace v3
{
/// \cond
namespace index_detail
{
template<typename Rng, typename T>
using Concept = meta::and_<
RandomAccessRange<Rng>,
// Only evaluate this one if the previous one succeeded
meta::lazy::invoke<
meta::compose<
meta::bind_front<meta::quote<ConvertibleTo>, T>,
meta::quote<range_difference_type_t>>,
Rng>>;
} // namespace index_detail
/// \endcond
/// Unchecked indexed range access.
///
/// \ingroup group-core
struct index_fn
{
/// \return `begin(rng)[n]`
template<typename Rng,
CONCEPT_REQUIRES_(RandomAccessRange<Rng>())>
RANGES_CXX14_CONSTEXPR
auto operator()(Rng &&rng, range_difference_type_t<Rng> n) const
noexcept(noexcept(ranges::begin(rng)[n]) &&
noexcept(n < ranges::distance(rng)))
->
decltype(ranges::begin(rng)[n])
{
RANGES_EXPECT(!SizedRange<Rng>() || n < ranges::distance(rng));
return ranges::begin(rng)[n];
}
/// \return `begin(rng)[n]`
template<typename Rng, typename T, typename Self = index_fn,
typename D = range_difference_type_t<Rng>,
CONCEPT_REQUIRES_(RandomAccessRange<Rng>() &&
!Same<uncvref_t<T>, D>() &&
ConvertibleTo<T, D>())>
RANGES_CXX14_CONSTEXPR
auto operator()(Rng &&rng, T &&t) const
RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT
(
Self{}((Rng &&) rng, static_cast<D>((T &&) t))
)
/// \cond
template<typename R, typename T,
CONCEPT_REQUIRES_(!index_detail::Concept<R, T>())>
void operator()(R&&, T&&) const
{
CONCEPT_ASSERT_MSG(RandomAccessRange<R>(),
"ranges::index(rng, idx): rng argument must be a model of the RandomAccessRange concept.");
CONCEPT_ASSERT_MSG(ConvertibleTo<T, range_difference_type_t<R>>(),
"ranges::index(rng, idx): idx argument must be convertible to range_difference_type_t<rng>.");
}
/// \endcond
};
/// Unchecked indexed range access.
///
/// \ingroup group-core
/// \sa `index_fn`
RANGES_INLINE_VARIABLE(index_fn, index)
}
}
#endif // RANGES_V3_INDEX_HPP
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