13#ifndef RANGES_V3_ALGORITHM_SHUFFLE_HPP
14#define RANGES_V3_ALGORITHM_SHUFFLE_HPP
29#include <range/v3/utility/static_const.hpp>
32#include <range/v3/detail/prologue.hpp>
38 RANGES_FUNC_BEGIN(shuffle)
41 template(typename I, typename S, typename Gen = detail::default_random_engine &)(
45 convertible_to<invoke_result_t<Gen &>, iter_difference_t<I>>)
46 I RANGES_FUNC(shuffle)(I const first,
48 Gen && gen = detail::get_random_engine())
53 using D1 = iter_difference_t<I>;
56 std::uniform_int_distribution<D2> uid{};
57 using param_t =
typename decltype(uid)::param_type;
60 RANGES_ENSURE(mid - first <= PTRDIFF_MAX);
61 if(
auto const i = uid(gen, param_t{0, D2(mid - first)}))
62 ranges::iter_swap(mid - i, mid);
68 template(
typename Rng,
typename Gen = detail::default_random_engine &)(
71 convertible_to<invoke_result_t<Gen &>,
73 borrowed_iterator_t<Rng>
74 RANGES_FUNC(shuffle)(Rng && rng, Gen && rand = detail::get_random_engine())
76 return (*
this)(begin(rng), end(rng),
static_cast<Gen &&
>(rand));
79 RANGES_FUNC_END(shuffle)
83 using ranges::shuffle;
88#include <range/v3/detail/epilogue.hpp>
The random_access_iterator concept.
The random_access_range concept.
The sentinel_for concept.
decltype(begin(declval(Rng &))) iterator_t
Definition access.hpp:698
typename detail::_cond< If >::template invoke< Then, Else > conditional_t
Select one type or another depending on a compile-time Boolean.
Definition meta.hpp:1148