/usr/include/range/v3/at.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_AT_HPP
#define RANGES_V3_AT_HPP
#include <stdexcept>
#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>
#include <range/v3/index.hpp>
namespace ranges
{
inline namespace v3
{
/// Checked indexed range access.
///
/// \ingroup group-core
struct at_fn
{
/// \return `begin(rng)[n]`
template<typename Rng,
CONCEPT_REQUIRES_(RandomAccessRange<Rng>() && SizedRange<Rng>())>
RANGES_CXX14_CONSTEXPR
auto operator()(Rng &&rng, range_difference_type_t<Rng> n) const ->
decltype(ranges::begin(rng)[n])
{
// Workaround https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67371 in GCC 5
check_throw(rng, n);
return ranges::begin(rng)[n];
}
/// \return `begin(rng)[n]`
template<typename Rng,
CONCEPT_REQUIRES_(RandomAccessRange<Rng>() && !SizedRange<Rng>())>
RANGES_DEPRECATED(
"Checked indexed range access (ranges::at) on !SizedRanges is deprecated! "
"This version performs unchecked access (the range size cannot be computed in O(1) for !SizedRanges)! "
"Use ranges::index for unchecked access instead!")
RANGES_CXX14_CONSTEXPR
auto operator()(Rng &&rng, range_difference_type_t<Rng> n) const
RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT
(
index(std::forward<Rng>(rng), n)
)
/// \return `begin(rng)[n]`
template<typename Rng, typename T, typename Self = at_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::at(rng, idx): rng argument must be a model of the RandomAccessRange concept.");
CONCEPT_ASSERT_MSG(ConvertibleTo<T, range_difference_type_t<R>>(),
"ranges::at(rng, idx): idx argument must be convertible to range_difference_type_t<rng>.");
}
private:
template<class Rng>
RANGES_CXX14_CONSTEXPR
static void check_throw(Rng &&rng, range_difference_type_t<Rng> n)
{
(n < 0 || n >= ranges::distance(rng)) ? throw std::out_of_range("ranges::at") : void(0);
}
/// \endcond
};
/// Checked indexed range access.
///
/// \ingroup group-core
/// \sa `at_fn`
RANGES_INLINE_VARIABLE(at_fn, at)
}
}
#endif
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