/usr/include/range/v3/action/shuffle.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 Filip Matzner 2015
//
// 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_ACTION_SHUFFLE_HPP
#define RANGES_V3_ACTION_SHUFFLE_HPP
#include <functional>
#include <range/v3/range_fwd.hpp>
#include <range/v3/action/action.hpp>
#include <range/v3/algorithm/shuffle.hpp>
#include <range/v3/utility/functional.hpp>
#include <range/v3/utility/iterator_concepts.hpp>
#include <range/v3/utility/iterator_traits.hpp>
#include <range/v3/utility/static_const.hpp>
namespace ranges
{
inline namespace v3
{
/// \addtogroup group-actions
/// @{
namespace action
{
struct shuffle_fn
{
private:
friend action_access;
template<typename Gen,
CONCEPT_REQUIRES_(UniformRandomNumberGenerator<Gen>())>
static auto bind(shuffle_fn shuffle, Gen && gen)
RANGES_DECLTYPE_AUTO_RETURN
(
std::bind(shuffle, std::placeholders::_1, bind_forward<Gen>(gen))
)
public:
struct ConceptImpl
{
template<typename Rng, typename Gen,
typename I = iterator_t<Rng>>
auto requires_() -> decltype(
concepts::valid_expr(
concepts::model_of<concepts::RandomAccessRange, Rng>(),
concepts::is_true(Permutable<I>()),
concepts::is_true(UniformRandomNumberGenerator<Gen>()),
concepts::is_true(ConvertibleTo<
concepts::UniformRandomNumberGenerator::result_t<Gen>,
difference_type_t<I>>())
));
};
template<typename Rng, typename Gen>
using Concept = concepts::models<ConceptImpl, Rng, Gen>;
template<typename Rng, typename Gen,
CONCEPT_REQUIRES_(Concept<Rng, Gen>())>
Rng operator()(Rng && rng, Gen && gen) const
{
ranges::shuffle(rng, static_cast<Gen&&>(gen));
return static_cast<Rng&&>(rng);
}
#ifndef RANGES_DOXYGEN_INVOKED
template<typename Rng, typename Gen,
CONCEPT_REQUIRES_(!Concept<Rng, Gen>())>
void operator()(Rng &&, Gen &&) const
{
CONCEPT_ASSERT_MSG(RandomAccessRange<Rng>(),
"The object on which action::shuffle operates must be a model of the "
"RandomAccessRange concept.");
using I = iterator_t<Rng>;
CONCEPT_ASSERT_MSG(Permutable<I>(),
"The iterator type of the range passed to action::shuffle must allow its "
"elements to be permuted; that is, the values must be movable and the "
"iterator must be mutable.");
CONCEPT_ASSERT_MSG(UniformRandomNumberGenerator<Gen>(),
"The generator passed to action::shuffle must fulfill the "
"UniformRandomNumberGenerator concept.");
CONCEPT_ASSERT_MSG(ConvertibleTo<
concepts::UniformRandomNumberGenerator::result_t<Gen>,
difference_type_t<I>>(),
"The random generator passed to action::shuffle has to have a return type "
"convertible to the container iterator difference type.");
}
#endif
};
/// \ingroup group-actions
/// \relates shuffle_fn
/// \sa `action`
RANGES_INLINE_VARIABLE(action<shuffle_fn>, shuffle)
}
/// @}
}
}
#endif
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