/usr/include/range/v3/front.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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | /// \file
// Range v3 library
//
// Copyright Eric Niebler 2014-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_FRONT_HPP
#define RANGES_V3_FRONT_HPP
#include <range/v3/range_fwd.hpp>
#include <range/v3/begin_end.hpp>
#include <range/v3/range_concepts.hpp>
#include <range/v3/range_traits.hpp>
#include <range/v3/utility/static_const.hpp>
namespace ranges
{
inline namespace v3
{
/// \ingroup group-core
struct front_fn
{
/// \return `*begin(rng)`
template<typename Rng,
CONCEPT_REQUIRES_(ForwardRange<Rng>())>
constexpr range_reference_t<Rng> operator()(Rng &&rng) const
{
return *begin(rng);
}
};
/// \ingroup group-core
/// \sa `front_fn`
RANGES_INLINE_VARIABLE(front_fn, front)
}
}
#endif
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