/usr/include/range/v3/view/single.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
//
// 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_SINGLE_HPP
#define RANGES_V3_VIEW_SINGLE_HPP
#include <utility>
#include <type_traits>
#include <range/v3/detail/satisfy_boost_range.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/view_facade.hpp>
#include <range/v3/utility/iterator_concepts.hpp>
#include <range/v3/utility/iterator_traits.hpp>
#include <range/v3/utility/semiregular.hpp>
#include <range/v3/utility/static_const.hpp>
namespace ranges
{
inline namespace v3
{
/// \addtogroup group-views
/// @{
template<typename Val>
struct single_view
: view_facade<single_view<Val>, (cardinality)1>
{
private:
friend struct ranges::range_access;
semiregular_t<Val> value_;
struct cursor
{
private:
semiregular_t<Val> value_;
bool done_;
public:
cursor() = default;
explicit cursor(Val value)
: value_(std::move(value)), done_(false)
{}
Val read() const
{
return value_;
}
bool equal(default_sentinel) const
{
return done_;
}
bool equal(cursor const &that) const
{
return done_ == that.done_;
}
void next()
{
done_ = true;
}
void prev()
{
done_ = false;
}
void advance(std::ptrdiff_t n)
{
n += done_;
RANGES_EXPECT(n == 0 || n == 1);
done_ = n != 0;
}
std::ptrdiff_t distance_to(cursor const &that) const
{
return that.done_ - done_;
}
};
cursor begin_cursor() const
{
return cursor{value_};
}
public:
single_view() = default;
constexpr explicit single_view(Val value)
: value_(detail::move(value))
{}
constexpr std::size_t size() const
{
return 1;
}
};
namespace view
{
struct single_fn
{
template<typename Val, CONCEPT_REQUIRES_(CopyConstructible<Val>())>
single_view<Val> operator()(Val value) const
{
return single_view<Val>{std::move(value)};
}
#ifndef RANGES_DOXYGEN_INVOKED
// For error reporting
template<typename Arg, typename Val = detail::decay_t<Arg>,
CONCEPT_REQUIRES_(!(CopyConstructible<Val>() && Constructible<Val, Arg>()))>
void operator()(Arg &&) const
{
CONCEPT_ASSERT_MSG(CopyConstructible<Val>(),
"The object passed to view::single must be a model of the CopyConstructible "
"concept; that is, it needs to be copy and move constructible, and destructible.");
CONCEPT_ASSERT_MSG(!CopyConstructible<Val>() || Constructible<Val, Arg>(),
"The object type passed to view::single must be initializable from the "
"actual argument expression.");
}
#endif
};
/// \relates single_fn
/// \ingroup group-views
RANGES_INLINE_VARIABLE(single_fn, single)
}
/// @}
}
}
RANGES_SATISFY_BOOST_RANGE(::ranges::v3::single_view)
#endif
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