23namespace seqan3::detail
54template <std::ranges::viewable_range resource_t,
55 std::semiregular algorithm_t,
56 std::semiregular algorithm_result_t,
57 typename execution_handler_t = execution_handler_sequential>
58 requires std::ranges::forward_range<resource_t>
59 && std::invocable<algorithm_t,
60 std::ranges::range_reference_t<resource_t>,
62class algorithm_executor_blocking
69 using resource_type = std::views::all_t<resource_t>;
71 using resource_iterator_type = std::ranges::iterator_t<resource_type>;
82 using bucket_iterator_type = std::ranges::iterator_t<bucket_type>;
86 using buffer_iterator_type = std::ranges::iterator_t<buffer_type>;
103 algorithm_executor_blocking() =
delete;
105 algorithm_executor_blocking(algorithm_executor_blocking
const &) =
delete;
124 algorithm_executor_blocking(algorithm_executor_blocking && other) noexcept :
125 algorithm_executor_blocking{std::move(other), other.resource_position()}
129 algorithm_executor_blocking & operator=(algorithm_executor_blocking
const &) =
delete;
133 algorithm_executor_blocking & operator=(algorithm_executor_blocking && other)
135 auto old_resource_position = other.resource_position();
137 resource = std::move(other.resource);
138 move_initialise(std::move(other), old_resource_position);
143 ~algorithm_executor_blocking() =
default;
159 algorithm_executor_blocking(resource_t resource,
160 algorithm_t algorithm,
161 algorithm_result_t
const SEQAN3_DOXYGEN_ONLY(result) = algorithm_result_t{},
162 execution_handler_t && exec_handler = execution_handler_t{}) :
163 exec_handler{std::move(exec_handler)},
164 resource{std::forward<resource_t>(resource)},
166 algorithm{std::move(algorithm)}
168 if constexpr (std::same_as<execution_handler_t, execution_handler_parallel>)
169 buffer_size =
static_cast<size_t>(std::ranges::distance(this->resource));
171 buffer.resize(buffer_size);
172 buffer_it = buffer.end();
173 buffer_end_it = buffer_it;
201 while (status == fill_status::empty_buffer);
203 if (status == fill_status::end_of_resource)
204 return {std::nullopt};
206 assert(status == fill_status::non_empty_buffer);
207 assert(bucket_it != buffer_it->end());
217 return resource_it == std::ranges::end(resource);
226 algorithm_executor_blocking(algorithm_executor_blocking && other,
227 resource_difference_type old_resource_position) noexcept :
228 resource{std::move(other.resource)}
230 move_initialise(std::move(other), old_resource_position);
239 resource_difference_type resource_position()
243 assert(position >= 0);
248 fill_status fill_buffer()
250 if (!is_buffer_empty())
251 return fill_status::non_empty_buffer;
254 return fill_status::end_of_resource;
260 for (buffer_end_it = buffer_it; buffer_end_it != buffer.end() && !
is_eof(); ++buffer_end_it, ++resource_it)
262 exec_handler.execute(algorithm,
264 [target_buffer_it = buffer_end_it](
auto && algorithm_result)
266 target_buffer_it->push_back(std::move(algorithm_result));
273 find_next_non_empty_bucket();
275 if (is_buffer_empty())
276 return fill_status::empty_buffer;
278 return fill_status::non_empty_buffer;
284 bool is_buffer_empty()
const
286 return buffer_it == buffer_end_it;
300 for (
auto & bucket : buffer)
304 buffer_it = buffer.begin();
315 void find_next_non_empty_bucket()
317 assert(buffer_it <= buffer_end_it);
321 [](
auto const & buffer)
323 return !buffer.empty();
326 if (buffer_it != buffer_end_it)
327 bucket_it = buffer_it->begin();
337 void go_to_next_result()
339 if (++bucket_it == buffer_it->end())
342 find_next_non_empty_bucket();
347 void move_initialise(algorithm_executor_blocking && other, resource_difference_type old_resource_position)
noexcept
349 algorithm = std::move(other.algorithm);
350 buffer_size = std::move(other.buffer_size);
351 exec_handler = std::move(other.exec_handler);
356 auto buffer_it_position = other.buffer_it - other.buffer.begin();
357 auto buffer_end_it_position = other.buffer_end_it - other.buffer.begin();
360 if (buffer_it_position != buffer_end_it_position)
361 bucket_it_position = other.bucket_it - other.buffer_it->begin();
364 buffer = std::move(other.buffer);
365 buffer_it = buffer.begin() + buffer_it_position;
366 buffer_end_it = buffer.begin() + buffer_end_it_position;
368 if (buffer_it_position != buffer_end_it_position)
369 bucket_it = buffer_it->begin() + bucket_it_position;
373 execution_handler_t exec_handler{};
376 resource_type resource;
378 resource_iterator_type resource_it{};
380 algorithm_t algorithm{};
383 buffer_type buffer{};
385 buffer_iterator_type buffer_it{};
387 buffer_iterator_type buffer_end_it{};
389 bucket_iterator_type bucket_it{};
391 size_t buffer_size{1};
400template <
typename resource_rng_t, std::semiregular algorithm_t, std::semiregular algorithm_result_t>
401algorithm_executor_blocking(resource_rng_t &&, algorithm_t, algorithm_result_t
const &)
402 -> algorithm_executor_blocking<resource_rng_t, algorithm_t, algorithm_result_t, execution_handler_sequential>;
Provides seqan3::detail::execution_handler_parallel.
Provides seqan3::detail::execution_handler_sequential.
constexpr auto is_eof
Checks whether a given letter is equal to the EOF constant defined in <cstdio>.
Definition: predicate.hpp:75