/usr/include/range/v3/view/indices.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
// Copyright Gonzalo Brito Gadeschi
//
// 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_VIEW_INDICES_HPP
#define RANGES_V3_VIEW_INDICES_HPP
#include <meta/meta.hpp>
#include <range/v3/detail/satisfy_boost_range.hpp>
#include <range/v3/range_fwd.hpp>
#include <range/v3/range_concepts.hpp>
#include <range/v3/utility/static_const.hpp>
#include <range/v3/view/take_exactly.hpp>
#include <range/v3/view/iota.hpp>
namespace ranges
{
inline namespace v3
{
namespace view
{
/// Half-open range of indices: [from, to).
struct indices_fn
: iota_view<std::ptrdiff_t>
{
indices_fn() = default;
template<typename Val, CONCEPT_REQUIRES_(Integral<Val>())>
auto operator()(Val from, Val to) const
RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT
(
detail::take_exactly_view_<iota_view<Val>, true>
{iota_view<Val>{from}, detail::ints_open_distance_(from, to)}
)
template<typename Val, typename Self = indices_fn,
CONCEPT_REQUIRES_(Integral<Val>())>
auto operator()(Val to) const
RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT
(
Self{}(Val(), to)
)
#ifndef RANGES_DOXYGEN_INVOKED
template<typename Val, CONCEPT_REQUIRES_(!Integral<Val>())>
void operator()(Val) const
{
CONCEPT_ASSERT_MSG(Integral<Val>(),
"The object passed to view::indices must be Integral");
}
template<typename Val, CONCEPT_REQUIRES_(!Integral<Val>())>
void operator()(Val, Val) const
{
CONCEPT_ASSERT_MSG(Integral<Val>(),
"The object passed to view::indices must be Integral");
}
#endif
};
/// Inclusive range of indices: [from, to].
struct closed_indices_fn
: iota_view<std::ptrdiff_t>
{
template<typename Val, CONCEPT_REQUIRES_(Integral<Val>())>
auto operator()(Val from, Val to) const
RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT
(
detail::take_exactly_view_<iota_view<Val>, true>
{iota_view<Val>{from}, detail::ints_closed_distance_(from, to)}
)
template<typename Val, typename Self = closed_indices_fn,
CONCEPT_REQUIRES_(Integral<Val>())>
auto operator()(Val to) const
RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT
(
Self{}(Val(), to)
)
#ifndef RANGES_DOXYGEN_INVOKED
template<typename Val, CONCEPT_REQUIRES_(!Integral<Val>())>
void operator()(Val) const
{
CONCEPT_ASSERT_MSG(Integral<Val>(),
"The object passed to view::closed_indices must be Integral");
}
template<typename Val, CONCEPT_REQUIRES_(!Integral<Val>())>
void operator()(Val, Val) const
{
CONCEPT_ASSERT_MSG(Integral<Val>(),
"The object passed to view::closed_indices must be Integral");
}
#endif
};
/// \relates indices_fn
/// \ingroup group-views
RANGES_INLINE_VARIABLE(indices_fn, indices)
/// \relates closed_indices_fn
/// \ingroup group-views
RANGES_INLINE_VARIABLE(closed_indices_fn, closed_indices)
} // namespace view
}
}
#endif // RANGES_V3_VIEW_INDICES_HPP
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