/usr/include/range/v3/data.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 Casey Carter 2016
//
// 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_DATA_HPP
#define RANGES_V3_DATA_HPP
#include <string>
#include <type_traits>
#include <range/v3/begin_end.hpp>
#include <range/v3/range_fwd.hpp>
#include <range/v3/utility/concepts.hpp>
#include <range/v3/utility/static_const.hpp>
namespace ranges
{
inline namespace v3
{
// Customization point data
/// \cond
namespace data_detail
{
class data_fn
{
template<typename Rng,
typename Ptr = decltype(begin(std::declval<Rng &>())),
CONCEPT_REQUIRES_(std::is_pointer<Ptr>())>
static constexpr Ptr impl(Rng &rng, detail::priority_tag<0>)
noexcept(noexcept(begin(rng)))
{
return begin(rng);
}
template<typename Rng,
typename Ptr = detail::decay_t<decltype(data(std::declval<Rng &>()))>,
CONCEPT_REQUIRES_(std::is_pointer<Ptr>())>
static constexpr Ptr impl(Rng &rng, detail::priority_tag<1>)
noexcept(noexcept(data(rng)))
{
return data(rng);
}
template<typename Rng,
typename Ptr = detail::decay_t<decltype(std::declval<Rng &>().data())>,
CONCEPT_REQUIRES_(std::is_pointer<Ptr>())>
static constexpr Ptr impl(Rng &rng, detail::priority_tag<2>)
noexcept(noexcept(rng.data()))
{
return rng.data();
}
template<typename T, std::size_t N>
static constexpr T *impl(T (&a)[N], detail::priority_tag<2>) noexcept
{
return a + 0;
}
template<typename charT, typename Traits, typename Alloc>
static constexpr charT *impl(
std::basic_string<charT, Traits, Alloc> &s,
detail::priority_tag<2>) noexcept
{
// string doesn't have non-const data before C++17
return const_cast<charT *>(detail::as_const(s).data());
}
public:
template<typename Rng>
constexpr auto operator()(Rng &rng) const
RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT
(
data_fn::impl(rng, detail::priority_tag<2>{})
)
};
}
/// \endcond
RANGES_INLINE_VARIABLE(data_detail::data_fn, data)
}
}
#endif // RANGES_V3_DATA_HPP
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