xtd 1.0.0
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enumerable.hpp
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1
4#pragma once
7
9namespace xtd {
11 namespace collections {
13 namespace generic {
15 namespace extensions {
31 template<typename value_t, typename enumerable_t>
32 class enumerable {
33 public:
35
38 using enumerable_type = enumerable_t;
40 using value_type = value_t;
42 template<typename type_t>
44
46 template<typename type_t>
49
51
59 template<xtd::func_callable<value_t, value_t, value_t> func_t>
60 [[nodiscard]] auto aggregate(func_t&& func) const -> value_t {
61 return xtd::linq::enumerable::aggregate(self(), std::forward<func_t>(func));
62 }
63
71 template<typename accumulate_t, xtd::func_callable<accumulate_t, accumulate_t, value_t> func_t>
72 [[nodiscard]] auto aggregate(accumulate_t&& seed, func_t&& func) const -> accumulate_t {
73 return xtd::linq::enumerable::aggregate(self(), std::forward<accumulate_t>(seed), std::forward<func_t>(func));
74 }
75
85 template<typename result_t, typename accumulate_t, xtd::func_callable<accumulate_t, accumulate_t, value_t> func_t, xtd::func_callable<result_t, value_t> result_selector_t>
86 [[nodiscard]] auto aggregate(accumulate_t&& seed, func_t&& func, result_selector_t&& result_selector) const -> result_t {
87 return xtd::linq::enumerable::aggregate(self(), std::forward<accumulate_t>(seed), std::forward<func_t>(func), std::forward<result_selector_t>(result_selector));
88 }
89
96 template<xtd::predicate_callable<value_t> predicate_t>
97 [[nodiscard]] auto all(predicate_t&& predicate) const -> bool {
98 return xtd::linq::enumerable::all(self(), std::forward<predicate_t>(predicate));
99 }
100
106 [[nodiscard]] auto any() const noexcept -> bool {
107 return xtd::linq::enumerable::any(self());
108 }
109
115 template<xtd::predicate_callable<value_t> predicate_t>
116 [[nodiscard]] auto any(predicate_t&& predicate) const -> bool {
117 return xtd::linq::enumerable::any(self(), std::forward<predicate_t>(predicate));
118 }
119
126 template<typename element_t>
127 [[nodiscard]] auto append(element_t&& element) const noexcept -> xtd::collections::generic::enumerable_generator<value_t> {
128 return xtd::linq::enumerable::append(self(), std::forward<element_t>(element));
129 }
130
136 [[nodiscard]] auto as_enumerable() const noexcept {
138 }
139
143 [[nodiscard]] auto average() const noexcept {
144 return xtd::linq::enumerable::average(self());
145 }
146
151 template<typename result_t>
152 [[nodiscard]] auto cast() const noexcept -> xtd::collections::generic::enumerable_generator<result_t> {
154 }
155
162
166 template<xtd::iterable second_t>
167 [[nodiscard]] auto concat(second_t&& second) const noexcept -> xtd::collections::generic::enumerable_generator<value_t> {
168 return xtd::linq::enumerable::concat(self(), std::forward<second_t>(second));
169 }
170
174 [[nodiscard]] auto contains(value_t&& value) const noexcept -> bool {
175 return xtd::linq::enumerable::contains(self(), std::forward<value_t>(value));
176 }
177
181 [[nodiscard]] auto contains(value_t&& value, xtd::collections::generic::iequality_comparer<value_t>&& comparer) const noexcept -> bool {
182 return xtd::linq::enumerable::contains(self(), std::forward<value_t>(value), std::forward<xtd::collections::generic::iequality_comparer<value_t>>(comparer));
183 }
184
188 template<xtd::func_callable<bool, value_t, value_t> equater_t>
189 [[nodiscard]] auto contains(value_t&& value, equater_t&& equater) const noexcept -> bool {
190 return xtd::linq::enumerable::contains(self(), std::forward<value_t>(value), std::forward<equater_t>(equater));
191 }
192
198 [[nodiscard]] auto count() const noexcept -> xtd::usize {
199 return xtd::linq::enumerable::count(self());
200 }
201
207 template<xtd::predicate_callable<value_t> predicate_t>
208 [[nodiscard]] auto count(predicate_t&& predicate) const noexcept -> xtd::usize {
209 return xtd::linq::enumerable::count(self(), std::forward<predicate_t>(predicate));
210 }
211
214 [[nodiscard]] auto count(value_t&& value) const noexcept -> xtd::usize {
215 return xtd::linq::enumerable::count(self(), std::forward<value_t>(value));
216 }
217
225 template<typename key_t, xtd::callable<key_t, value_t> key_selector_t>
226 [[nodiscard]] auto count_by(key_selector_t&& key_selector) const noexcept {
227 return xtd::linq::enumerable::count_by<key_t>(self(), std::forward<key_selector_t>(key_selector));
228 }
229
237 template<typename key_t, xtd::callable<key_t, value_t> key_selector_t>
239 return xtd::linq::enumerable::count_by<key_t>(self(), std::forward<key_selector_t>(key_selector), std::forward<xtd::collections::generic::iequality_comparer<key_t>>(key_comparer));
240 }
241
249 template<typename key_t, xtd::callable<key_t, value_t> key_selector_t, xtd::func_callable<bool, key_t, key_t> key_equater_t>
250 [[nodiscard]] auto count_by(key_selector_t&& key_selector, key_equater_t&& key_equater) const noexcept -> xtd::collections::generic::enumerable_generator<xtd::collections::generic::key_value_pair<key_t, xtd::usize>> {
251 return xtd::linq::enumerable::count_by<key_t, value_t>(self(), std::forward<key_selector_t>(key_selector), std::forward<key_equater_t>(key_equater));
252 }
253
256 [[nodiscard]] auto default_if_empty() const noexcept -> xtd::collections::generic::enumerable_generator<value_t> {
258 }
259
262 [[nodiscard]] auto default_if_empty(const value_t& default_value) const noexcept -> xtd::collections::generic::enumerable_generator<value_t> {
263 return xtd::linq::enumerable::default_if_empty(self(), default_value);
264 }
265
268 [[nodiscard]] auto distinct() const noexcept -> xtd::collections::generic::enumerable_generator<value_t> {
269 return xtd::linq::enumerable::distinct(self());
270 }
271
277
280 template<xtd::func_callable<bool, value_t, value_t> equater_t>
281 [[nodiscard]] auto distinct(equater_t&& equater) const noexcept -> xtd::collections::generic::enumerable_generator<value_t> {
282 return xtd::linq::enumerable::distinct(self(), std::forward<equater_t>(equater));
283 }
284
289 [[nodiscard]] auto first() const -> value_t {
290 return xtd::linq::enumerable::first(self());
291 }
292
297 template<xtd::func_callable<bool, value_t> prediacte_t>
298 [[nodiscard]] auto first(prediacte_t&& prediacte) const -> value_t {
299 return xtd::linq::enumerable::first(self(), std::forward<prediacte_t>(prediacte));
300 }
301
306 template<xtd::predicate_callable<value_t> predicate_t>
307 [[nodiscard]] auto first_or_default(predicate_t&& predicate, value_t&& default_value) const noexcept -> value_t {
308 return xtd::linq::enumerable::first_or_default(self(), std::forward<predicate_t>(predicate), std::forward<value_t>(default_value));
309 }
310
313 template<xtd::predicate_callable<value_t> predicate_t>
314 [[nodiscard]] auto first_or_default(predicate_t&& predicate) const noexcept -> value_t {
315 return xtd::linq::enumerable::first_or_default(self(), std::forward<predicate_t>(predicate));
316 }
317
320 [[nodiscard]] auto first_or_default(value_t&& default_value) const noexcept -> value_t {
321 return xtd::linq::enumerable::first_or_default(self(), std::forward<value_t>(default_value));
322 }
323
325 [[nodiscard]] auto first_or_default() const noexcept -> value_t {
327 }
328
333 [[nodiscard]] auto last() const -> value_t {
334 return xtd::linq::enumerable::last(self());
335 }
336
341 template<xtd::func_callable<bool, value_t> prediacte_t>
342 [[nodiscard]] auto last(prediacte_t&& prediacte) const -> value_t {
343 return xtd::linq::enumerable::last(self(), std::forward<prediacte_t>(prediacte));
344 }
345
348 [[nodiscard]] auto max() const -> value_t requires xtd::numeric<value_t> {
349 return xtd::linq::enumerable::max(self());
350 }
351
354 template<xtd::callable<value_t, value_t> selector_t>
355 [[nodiscard]] auto max(selector_t&& selector) const -> value_t requires xtd::numeric<value_t> {
356 return xtd::linq::enumerable::max(self(), std::forward<selector_t>(selector));
357 }
358
361 template<typename result_t, xtd::callable<result_t, value_t> selector_t>
363 [[nodiscard]] auto max(selector_t&& selector) const -> result_t {
364 return xtd::linq::enumerable::max<result_t>(self(), std::forward<selector_t>(selector));
365 }
366
369 [[nodiscard]] auto min() const -> value_t requires xtd::numeric<value_t> {
370 return xtd::linq::enumerable::min(self());
371 }
372
375 template<xtd::callable<value_t, value_t> selector_t>
376 [[nodiscard]] auto min(selector_t&& selector) const -> value_t requires xtd::numeric<value_t> {
377 return xtd::linq::enumerable::min(self(), selector);
378 }
379
382 template<typename result_t, xtd::callable<result_t, value_t> selector_t>
384 [[nodiscard]] auto min(selector_t&& selector) const -> result_t {
385 return xtd::linq::enumerable::min<result_t, value_t>(self(), selector);
386 }
387
390 [[nodiscard]] auto order() const -> xtd::collections::generic::enumerable_generator<value_t> {
391 return xtd::linq::enumerable::order(self());
392 }
393
399
402 template<xtd::func_callable<bool, value_t, value_t> lesser_t>
403 [[nodiscard]] auto order(lesser_t&& lesser) const -> xtd::collections::generic::enumerable_generator<value_t> {
404 return xtd::linq::enumerable::order(self(), lesser);
405 }
406
412 [[nodiscard]] auto order_by(const std::function<value_t(const value_t&)>& key_selector) const {
413 return xtd::linq::enumerable::order_by(self(), key_selector);
414 }
415
421 template<typename key_t>
422 [[nodiscard]] auto order_by_descending(const std::function<key_t(const value_t&)>& key_selector) const {
424 }
425
431 [[nodiscard]] auto order_by_descending(const std::function<value_t(const value_t&)>& key_selector) const {
432 return xtd::linq::enumerable::order_by_descending(self(), key_selector);
433 }
434
440 template<typename key_t>
441 [[nodiscard]] auto order_by(const std::function<key_t(const value_t&)>& key_selector) const {
442 return xtd::linq::enumerable::order_by<key_t, value_t>(self(), key_selector);
443 }
444
448 [[nodiscard]] auto reverse() const -> xtd::collections::generic::enumerable_generator<value_t> {
449 return xtd::linq::enumerable::reverse(self());
450 }
451
458 [[nodiscard]] auto select(auto&& selector) const {
459 return xtd::linq::enumerable::select(self(), selector);
460 }
461
466 template<xtd::iterable second_t>
467 [[nodiscard]] auto sequence_equal(second_t&& second) const -> bool {
468 return xtd::linq::enumerable::sequence_equal(self(), second);
469 }
470
474 template<xtd::iterable second_t>
475 [[nodiscard]] auto sequence_equal(second_t&& second, const xtd::collections::generic::iequality_comparer<value_t>& equality_comparer) const -> bool {
477 }
478
482 template<xtd::iterable second_t, xtd::func_callable<bool, value_t, xtd::iterable_value_type<second_t>> equality_comparer_t>
483 [[nodiscard]] auto sequence_equal(second_t&& second, equality_comparer_t&& equality_comparer) const -> bool {
485 }
486
490 [[nodiscard]] auto shuffle() const -> xtd::collections::generic::enumerable_generator<value_t> {
491 return xtd::linq::enumerable::shuffle(self());
492 }
493
500
510
518
525
535
541 [[nodiscard]] auto to_array() const -> xtd::array<value_t>;
542
548 [[nodiscard]] auto to_list() const -> xtd::collections::generic::list<value_t>;
549
559 [[nodiscard]] auto where(auto&& predicate) const {
561 }
562
569 template<xtd::iterable second_t>
571 return xtd::linq::enumerable::zip(self(), std::forward<second_t>(second));
572 }
573
580 template<xtd::iterable second_t>
581 [[nodiscard]] auto zip(second_t&& second, auto&& selector) const -> xtd::collections::generic::enumerable_generator<xtd::raw_type<decltype(selector(value_t {}, xtd::iterable_value_type<second_t> {}))>> {
582 return xtd::linq::enumerable::zip(self(), std::forward<second_t>(second), selector);
583 }
584
588 template<xtd::iterable second_t, xtd::iterable third_t>
590 return xtd::linq::enumerable::zip(self(), std::forward<second_t>(second), std::forward<third_t>(third));
591 }
592
597 template<xtd::iterable second_t, xtd::iterable third_t>
598 [[nodiscard]] auto zip(second_t&& second, third_t&& third, auto&& selector) const -> xtd::collections::generic::enumerable_generator<xtd::raw_type<decltype(selector(value_t {}, xtd::iterable_value_type<second_t> {}, xtd::iterable_value_type<third_t> {}))>> {
599 return xtd::linq::enumerable::zip(self(), std::forward<second_t>(second), std::forward<third_t>(third), selector);
600 }
601
602
603 private:
604 auto self() const noexcept -> const enumerable_t& {return static_cast<const enumerable_t&>(*this);}
605 };
606 }
607 }
608 }
609}
610
611#define __XTD_CORE_INTERNAL__
613#undef __XTD_CORE_INTERNAL__
614#include "../ienumerable.hpp"
Provides methods for creating, manipulating, searching, and sorting arrays, thereby serving as the ba...
Definition array.hpp:64
Provides a base class for implementations of the xtd::collections::generic::icomparer <type_t> generi...
Definition comparer.hpp:33
Represents an enumerable generator that supports deferred, lazy iteration over a collection of a spec...
Definition enumerable_generator.hpp:45
Provides a base class for implementations of the xtd::collections::generic::iequality_comparer <type_...
Definition equality_comparer.hpp:35
auto contains(value_t &&value) const noexcept -> bool
Determines whether a sequence contains a specified element by using the default equality comparer.
Definition enumerable.hpp:174
auto cast() const noexcept -> xtd::collections::generic::enumerable_generator< result_t >
Casts the elements of an xtd::collections::generic::ienumerable to the specified type.
Definition enumerable.hpp:152
auto to_list() const -> xtd::collections::generic::list< value_t >
Creates a xtd::collections::generic::list <type_t> from an xtd::collections::generic::ienumerable <ty...
auto max(selector_t &&selector) const -> result_t
Returns the maximum value in a sequence of xtd::numeric values.
Definition enumerable.hpp:363
value_t value_type
Represents the ienumerable value type.
Definition enumerable.hpp:40
auto count(predicate_t &&predicate) const noexcept -> xtd::usize
Returns a number that represents how many elements in the specified sequence satisfy a condition.
Definition enumerable.hpp:208
auto max(selector_t &&selector) const -> value_t
Returns the maximum value in a sequence of xtd::numeric values.
Definition enumerable.hpp:355
auto skip(xtd::usize count) const -> xtd::collections::generic::enumerable_generator< value_t >
Bypasses a specified number of elements in a sequence and then returns the remaining elements.
Definition enumerable.hpp:497
auto average() const noexcept
Computes the average of a sequence of value_t values.
Definition enumerable.hpp:143
auto last(prediacte_t &&prediacte) const -> value_t
Returns the last element in a sequence that satisfies a specified condition.
Definition enumerable.hpp:342
auto first_or_default(predicate_t &&predicate) const noexcept -> value_t
Returns the first element of the sequence that satisfies a condition or a default value if no such el...
Definition enumerable.hpp:314
auto zip(second_t &&second, third_t &&third, auto &&selector) const -> xtd::collections::generic::enumerable_generator< xtd::raw_type< decltype(selector(value_t {}, xtd::iterable_value_type< second_t > {}, xtd::iterable_value_type< third_t > {}))> >
Applies a specified function to the corresponding elements of three sequences, producing a sequence o...
Definition enumerable.hpp:598
auto order(const xtd::collections::generic::icomparer< value_t > &comparer) const -> xtd::collections::generic::enumerable_generator< value_t >
Sorts the elements of a sequence in ascending order.
Definition enumerable.hpp:396
auto last() const -> value_t
Returns the last element of a sequence.
Definition enumerable.hpp:333
auto take_while(auto &&predicate) const -> xtd::collections::generic::enumerable_generator< value_t >
Returns elements from a sequence as long as a specified condition is true, and then skips the remaini...
Definition enumerable.hpp:532
auto count_by(key_selector_t &&key_selector, key_equater_t &&key_equater) const noexcept -> xtd::collections::generic::enumerable_generator< xtd::collections::generic::key_value_pair< key_t, xtd::usize > >
Returns the count of elements in the current sequence grouped by key.
Definition enumerable.hpp:250
auto skip_while(auto &&predicate) const -> xtd::collections::generic::enumerable_generator< value_t >
Bypasses elements in a sequence as long as a specified condition is true and then returns the remaini...
Definition enumerable.hpp:507
auto take(xtd::usize count) const -> xtd::collections::generic::enumerable_generator< value_t >
Returns a specified number of contiguous elements from the start of a sequence.
Definition enumerable.hpp:515
auto first_or_default() const noexcept -> value_t
Returns the first element of the sequence that satisfies a condition or a default value if no such el...
Definition enumerable.hpp:325
auto take(const xtd::range &range) const -> xtd::collections::generic::enumerable_generator< value_t >
Returns a specified number of contiguous elements from the start of a sequence.
Definition enumerable.hpp:522
auto first(prediacte_t &&prediacte) const -> value_t
Returns the first element in a sequence that satisfies a specified condition.
Definition enumerable.hpp:298
auto distinct() const noexcept -> xtd::collections::generic::enumerable_generator< value_t >
Returns distinct elements from a sequence by using the default equality comparer to compare values.
Definition enumerable.hpp:268
auto aggregate(accumulate_t &&seed, func_t &&func, result_selector_t &&result_selector) const -> result_t
Applies an accumulator function over a sequence. The specified seed value is used as the initial accu...
Definition enumerable.hpp:86
auto count_by(key_selector_t &&key_selector) const noexcept
Returns the count of elements in the current sequence grouped by key.
Definition enumerable.hpp:226
auto reverse() const -> xtd::collections::generic::enumerable_generator< value_t >
Inverts the order of the elements in a sequence.
Definition enumerable.hpp:448
auto sequence_equal(second_t &&second, const xtd::collections::generic::iequality_comparer< value_t > &equality_comparer) const -> bool
Determines whether two sequences are equal by comparing their elements by using a specifie the equali...
Definition enumerable.hpp:475
auto any(predicate_t &&predicate) const -> bool
Determines whether any element of a sequence satisfies a condition.
Definition enumerable.hpp:116
enumerable_t enumerable_type
Represents the ienumerable enumerable type.
Definition enumerable.hpp:38
auto to_array() const -> xtd::array< value_t >
Creates a xtd::array <type_t> from an xtd::collections::generic::ienumerable <type_t>.
auto order_by_descending(const std::function< key_t(const value_t &)> &key_selector) const
Sorts the elements of a sequence in descending order according to a key.
Definition enumerable.hpp:422
auto append(element_t &&element) const noexcept -> xtd::collections::generic::enumerable_generator< value_t >
Appends a value to the end of the sequence.
Definition enumerable.hpp:127
auto min() const -> value_t
Returns the minimum value in a sequence of xtd::numeric values.
Definition enumerable.hpp:369
auto select(auto &&selector) const
Projects each element of a sequence into a new form.
Definition enumerable.hpp:458
auto order(lesser_t &&lesser) const -> xtd::collections::generic::enumerable_generator< value_t >
Sorts the elements of a sequence in ascending order.
Definition enumerable.hpp:403
auto any() const noexcept -> bool
Determines whether a sequence contains any elements.
Definition enumerable.hpp:106
auto order_by(const std::function< key_t(const value_t &)> &key_selector) const
Sorts the elements of a sequence in ascending order according to a key.
Definition enumerable.hpp:441
auto aggregate(accumulate_t &&seed, func_t &&func) const -> accumulate_t
Applies an accumulator function over a sequence. The specified seed value is used as the initial accu...
Definition enumerable.hpp:72
auto min(selector_t &&selector) const -> result_t
Returns the minimum value in a sequence of xtd::numeric values.
Definition enumerable.hpp:384
auto default_if_empty(const value_t &default_value) const noexcept -> xtd::collections::generic::enumerable_generator< value_t >
Returns the elements of the specified sequence or the specified value in a singleton collection if th...
Definition enumerable.hpp:262
auto first() const -> value_t
Returns the first element of a sequence.
Definition enumerable.hpp:289
auto max() const -> value_t
Returns the maximum value in a sequence of xtd::numeric values.
Definition enumerable.hpp:348
typename xtd::linq::enumerable::list< type_t > list
Represents the list value type.
Definition enumerable.hpp:47
auto zip(second_t &&second, third_t &&third) const -> xtd::collections::generic::enumerable_generator< std::tuple< value_t, xtd::iterable_value_type< second_t >, xtd::iterable_value_type< third_t > > >
Produces a sequence of tuples with elements from the three specified sequences.
Definition enumerable.hpp:589
auto zip(second_t &&second, auto &&selector) const -> xtd::collections::generic::enumerable_generator< xtd::raw_type< decltype(selector(value_t {}, xtd::iterable_value_type< second_t > {}))> >
Applies a specified function to the corresponding elements of two sequences, producing a sequence of ...
Definition enumerable.hpp:581
auto default_if_empty() const noexcept -> xtd::collections::generic::enumerable_generator< value_t >
Returns the elements of the specified sequence or the type parameter's default value in a singleton c...
Definition enumerable.hpp:256
auto order() const -> xtd::collections::generic::enumerable_generator< value_t >
Sorts the elements of a sequence in ascending order.
Definition enumerable.hpp:390
auto contains(value_t &&value, equater_t &&equater) const noexcept -> bool
Determines whether a sequence contains a specified element by using a specified equality comparer.
Definition enumerable.hpp:189
auto sequence_equal(second_t &&second) const -> bool
Determines whether two sequences are equal by comparing the elements by using the default equality co...
Definition enumerable.hpp:467
auto order_by_descending(const std::function< value_t(const value_t &)> &key_selector) const
Sorts the elements of a sequence in descending order according to a key.
Definition enumerable.hpp:431
auto distinct(equater_t &&equater) const noexcept -> xtd::collections::generic::enumerable_generator< value_t >
Returns distinct elements from a sequence by using a specified xtd::collections::generic::iequality_c...
Definition enumerable.hpp:281
auto all(predicate_t &&predicate) const -> bool
Determines whether all elements of a sequence satisfy a condition.
Definition enumerable.hpp:97
auto first_or_default(predicate_t &&predicate, value_t &&default_value) const noexcept -> value_t
Returns the first element of the sequence that satisfies a condition, or a specified default value if...
Definition enumerable.hpp:307
auto min(selector_t &&selector) const -> value_t
Returns the minimum value in a sequence of xtd::numeric values.
Definition enumerable.hpp:376
auto count() const noexcept -> xtd::usize
Returns the number of elements in current sequence.
Definition enumerable.hpp:198
auto chunk(xtd::usize size) const -> xtd::collections::generic::enumerable_generator< xtd::array< value_t > >
Splits the elements of a sequence into chunks of size at most size.
Definition enumerable.hpp:159
auto shuffle() const -> xtd::collections::generic::enumerable_generator< value_t >
Shuffles the order of the elements of a sequence.
Definition enumerable.hpp:490
auto contains(value_t &&value, xtd::collections::generic::iequality_comparer< value_t > &&comparer) const noexcept -> bool
Determines whether a sequence contains a specified element by using a specified equality comparer.
Definition enumerable.hpp:181
auto as_enumerable() const noexcept
Returns the input typed as xtd::collections::generic::ienumerable <type_t>.
Definition enumerable.hpp:136
auto order_by(const std::function< value_t(const value_t &)> &key_selector) const
Sorts the elements of a sequence in ascending order according to a key.
Definition enumerable.hpp:412
auto count_by(key_selector_t &&key_selector, xtd::collections::generic::iequality_comparer< key_t > &&key_comparer) const noexcept -> xtd::collections::generic::enumerable_generator< xtd::collections::generic::key_value_pair< key_t, xtd::usize > >
Returns the count of elements in the current sequence grouped by key.
Definition enumerable.hpp:238
auto sequence_equal(second_t &&second, equality_comparer_t &&equality_comparer) const -> bool
Determines whether two sequences are equal by comparing their elements by using a specifie the equali...
Definition enumerable.hpp:483
auto concat(second_t &&second) const noexcept -> xtd::collections::generic::enumerable_generator< value_t >
Concatenates two sequences.
Definition enumerable.hpp:167
auto aggregate(func_t &&func) const -> value_t
Applies an accumulator function over a sequence.
Definition enumerable.hpp:60
auto distinct(xtd::collections::generic::iequality_comparer< value_t > &&comparer) const noexcept -> xtd::collections::generic::enumerable_generator< value_t >
Returns distinct elements from a sequence by using a specified xtd::collections::generic::iequality_c...
Definition enumerable.hpp:274
typename xtd::linq::enumerable::ienumerable< type_t > ienumerable
Represents the ienumerable value type.
Definition enumerable.hpp:43
auto first_or_default(value_t &&default_value) const noexcept -> value_t
Returns the first element of the sequence that satisfies a condition or a default value if no such el...
Definition enumerable.hpp:320
auto where(auto &&predicate) const
Filters a sequence of values based on a predicate.
Definition enumerable.hpp:559
auto count(value_t &&value) const noexcept -> xtd::usize
Returns the number of elements with the specified value.
Definition enumerable.hpp:214
auto zip(second_t &&second) const -> xtd::collections::generic::enumerable_generator< std::tuple< value_t, xtd::iterable_value_type< second_t > > >
Produces a sequence of tuples with elements from the two specified sequences.
Definition enumerable.hpp:570
Exposes a method that compares two objects.
Definition icomparer.hpp:30
Defines methods to support the comparison of objects for equality.
Definition iequality_comparer.hpp:34
static auto chunk(source_t &&source, xtd::usize size) -> xtd::collections::generic::enumerable_generator< xtd::array< xtd::iterable_value_type< source_t > > >
Splits the elements of a sequence into chunks of size at most size.
static auto last(source_t &&source) -> xtd::iterable_value_type< source_t >
Returns the last element of a sequence.
static auto sequence_equal(first_t &&first, second_t &&second) -> bool
Determines whether two sequences are equal by comparing the elements by using the default equality co...
static auto zip(first_t &&first, second_t &&second) -> xtd::collections::generic::enumerable_generator< std::tuple< xtd::iterable_value_type< first_t >, xtd::iterable_value_type< second_t > > >
Produces a sequence of tuples with elements from the two specified sequences.
static auto skip_while(source_t &&source, auto &&predicate) -> xtd::collections::generic::enumerable_generator< xtd::iterable_value_type< source_t > >
Bypasses elements in a sequence as long as a specified condition is true and then returns the remaini...
static auto order_by_descending(source_t &&source, key_selector_t &&key_selector) -> xtd::collections::generic::enumerable_generator< xtd::iterable_value_type< source_t > >
Sorts the elements of a sequence in descending order according to a key.
typename xtd::collections::generic::ienumerable< type_t > ienumerable
Represents the ienumerable value type.
Definition enumerable_.hpp:91
static auto distinct(source_t &&source) noexcept -> xtd::collections::generic::enumerable_generator< xtd::iterable_value_type< source_t > >
Returns distinct elements from a sequence by using the default equality comparer to compare values.
static auto concat(first_t &&first, second_t &&second) noexcept -> xtd::collections::generic::enumerable_generator< xtd::iterable_value_type< first_t > >
Concatenates two sequences.
static auto first_or_default(source_t &&source, prediacte_t &&predicate, xtd::iterable_value_type< source_t > &&default_value) noexcept -> xtd::iterable_value_type< source_t >
Returns the first element of the sequence that satisfies a condition, or a specified default value if...
static auto min(source_t &&source) -> xtd::iterable_value_type< source_t >
Returns the minimum value in a sequence of xtd::numeric values.
typename xtd::collections::generic::list< type_t > list
Represents the list value type.
Definition enumerable_.hpp:95
static auto default_if_empty(source_t &&source) noexcept -> xtd::collections::generic::enumerable_generator< xtd::iterable_value_type< source_t > >
Returns the elements of the specified sequence or the type parameter's default value in a singleton c...
static auto contains(source_t &&source, const xtd::iterable_value_type< source_t > &value) noexcept -> bool
Determines whether a sequence contains a specified element by using the default equality comparer.
static auto take(source_t &&source, xtd::usize count) -> xtd::collections::generic::enumerable_generator< xtd::iterable_value_type< source_t > >
Returns a specified number of contiguous elements from the start of a sequence.
static auto count_by(source_t &&source, key_selector_t &&key_selector) noexcept -> xtd::collections::generic::enumerable_generator< xtd::collections::generic::key_value_pair< key_t, xtd::usize > >
Returns the count of elements in the source sequence grouped by key.
static auto all(source_t &&source, predicate_t &&predicate) -> bool
Determines whether all elements of a sequence satisfy a condition.
static auto shuffle(source_t &&source) -> xtd::collections::generic::enumerable_generator< xtd::iterable_value_type< source_t > >
Shuffles the order of the elements of a sequence.
Definition random.hpp:277
static auto order(source_t &&source) -> xtd::collections::generic::enumerable_generator< xtd::iterable_value_type< source_t > >
Sorts the elements of a sequence in ascending order.
static auto cast(source_t &&source) -> xtd::collections::generic::enumerable_generator< result_t >
Casts the elements of an xtd::collections::generic::ienumerable to the specified type.
static auto where(source_t &&source, auto &&predicate) -> xtd::collections::generic::enumerable_generator< xtd::iterable_value_type< source_t > >
Filters a sequence of values based on a predicate.
static auto aggregate(source_t &&source, func_t &&func) -> xtd::iterable_value_type< source_t >
Applies an accumulator function over a sequence.
static auto as_enumerable(source_t &&source) noexcept
Returns the input typed as xtd::collections::generic::ienumerable <type_t>.
static auto average(source_t &&source) -> xtd::decimal
Computes the average of a sequence of xtd::decimal values.
static auto append(source_t &&source, xtd::iterable_value_type< source_t > &&element) noexcept -> xtd::collections::generic::enumerable_generator< xtd::iterable_value_type< source_t > >
Appends a value to the end of the sequence.
static auto first(source_t &&source) -> xtd::iterable_value_type< source_t >
Returns the first element of a sequence.
static auto order_by(source_t &&source, key_selector_t &&key_selector) -> xtd::collections::generic::enumerable_generator< xtd::iterable_value_type< source_t > >
Sorts the elements of a sequence in ascending order according to a key.
static auto count(source_t &&source) noexcept -> xtd::usize
Returns the number of elements in a sequence.
static auto reverse(source_t &&source) -> xtd::collections::generic::enumerable_generator< xtd::iterable_value_type< source_t > >
Inverts the order of the elements in a sequence.
static auto skip(source_t &&source, xtd::usize count) -> xtd::collections::generic::enumerable_generator< xtd::iterable_value_type< source_t > >
Bypasses a specified number of elements in a sequence and then returns the remaining elements.
static auto select(source_t &&source, auto &&selector) -> xtd::collections::generic::enumerable_generator< xtd::raw_type< decltype(selector(xtd::iterable_value_type< source_t > {}))> >
Projects each element of a sequence into a new form.
static auto max(source_t &&source) -> xtd::iterable_value_type< source_t >
Returns the maximum value in a sequence of xtd::numeric values.
static auto take_while(source_t &&source, auto &&predicate) -> xtd::collections::generic::enumerable_generator< xtd::iterable_value_type< source_t > >
Returns elements from a sequence as long as a specified condition is true, and then skips the remaini...
static auto any(source_t &&source) noexcept -> bool
Determines whether a sequence contains any elements.
Represents a range that has start and end indexes.
Definition range.hpp:38
Definition enumerable.hpp:17
Definition numeric.hpp:12
Contains foreach_ keyword.
Contains xtd::collections::generic::ienumerable <type_t> interface.
xtd::raw_type< decltype(*std::begin(std::declval< iterable_t & >()))> iterable_value_type
Represents the orward iterable value type.
Definition iterable_value_type.hpp:29
xtd::delegate< result_t(arguments_t... arguments)> func
Represents a delegate that has variables parameters and returns a value of the type specified by the ...
Definition func.hpp:27
std::size_t usize
Represents an unsigned size of any object in bytes.
Definition usize.hpp:22
std::remove_cvref_t< value_t > raw_type
Represents a raw type alias equivalent to std::remove_cvref_t<value_t>.
Definition raw_type.hpp:25
xtd::func< bool, type_t > predicate
Represents a delegate that defines a set of criteria and determines whether the specified object meet...
Definition predicate.hpp:16
Contains xtd::linq::enumerable <type_t> class.
The xtd::extensions namespace contains interface extensions.
Definition collection_common.hpp:14
The xtd::collections::generic namespace contains interfaces and classes that define generic collectio...
Definition comparer.hpp:16
The xtd::collections namespace contains interfaces and classes that define various collections of obj...
Definition any_pair.hpp:10
The xtd namespace contains all fundamental classes to access Hardware, Os, System,...
Definition abstract_object.hpp:8
constexpr auto size() const noexcept -> size_type
Returns the number of elements.
Definition read_only_span.hpp:213