1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03, c++11, c++14
10// UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
11
12// <queue>
13
14// template<class Compare, class Container>
15// priority_queue(Compare, Container)
16// -> priority_queue<typename Container::value_type, Container, Compare>;
17//
18// template<class InputIterator,
19// class Compare = less<typename iterator_traits<InputIterator>::value_type>,
20// class Container = vector<typename iterator_traits<InputIterator>::value_type>>
21// priority_queue(InputIterator, InputIterator, Compare = Compare(), Container = Container())
22// -> priority_queue<typename iterator_traits<InputIterator>::value_type, Container, Compare>;
23//
24// template<class Compare, class Container, class Allocator>
25// priority_queue(Compare, Container, Allocator)
26// -> priority_queue<typename Container::value_type, Container, Compare>;
27//
28// template<ranges::input_range R, class Compare = less<ranges::range_value_t<R>>>
29// priority_queue(from_range_t, R&&, Compare = Compare())
30// -> priority_queue<ranges::range_value_t<R>, vector<ranges::range_value_t<R>>, Compare>; // C++23
31//
32// template<ranges::input_range R, class Compare, class Allocator>
33// priority_queue(from_range_t, R&&, Compare, Allocator)
34// -> priority_queue<ranges::range_value_t<R>, vector<ranges::range_value_t<R>, Allocator>,
35// Compare>; // C++23
36//
37// template<ranges::input_range R, class Allocator>
38// priority_queue(from_range_t, R&&, Allocator)
39// -> priority_queue<ranges::range_value_t<R>, vector<ranges::range_value_t<R>, Allocator>>; // C++23
40
41#include <cassert>
42#include <climits> // INT_MAX
43#include <cstddef>
44#include <iterator>
45#include <queue>
46#include <vector>
47
48#include "deduction_guides_sfinae_checks.h"
49#include "test_macros.h"
50#include "test_iterators.h"
51#include "test_allocator.h"
52
53struct A {};
54
55int main(int, char**) {
56 // Test the explicit deduction guides
57 {
58 std::vector<int> v{0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
59 std::priority_queue pri(std::greater<int>(), v); // priority_queue(Compare, Container)
60
61 static_assert(std::is_same_v<decltype(pri), std::priority_queue<int, std::vector<int>, std::greater<int>>>, "");
62 assert(pri.size() == v.size());
63 assert(pri.top() == 0);
64 }
65
66 {
67 std::vector<long, test_allocator<long>> v{10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
68 std::priority_queue pri(
69 std::greater<long>(), v, test_allocator<long>(2)); // priority_queue(Compare, Container, Allocator)
70
71 static_assert(
72 std::is_same_v<decltype(pri),
73 std::priority_queue<long, std::vector<long, test_allocator<long>>, std::greater<long>>>,
74 "");
75 assert(pri.size() == v.size());
76 assert(pri.top() == 10);
77 }
78
79 {
80 std::vector<short> v{10, 11, 12, 13, 14, 15, 28, 17, 18, 19};
81 std::priority_queue pri(v.begin(), v.end()); // priority_queue(Iter, Iter)
82
83 static_assert(std::is_same_v<decltype(pri), std::priority_queue<short>>, "");
84 assert(pri.size() == v.size());
85 assert(pri.top() == 28);
86 }
87
88 {
89 std::vector<double> v{10, 11, 12, 13, 6, 15, 28, 17, 18, 19};
90 std::priority_queue pri(v.begin(), v.end(), std::greater<double>()); // priority_queue(Iter, Iter, Comp)
91
92 static_assert(
93 std::is_same_v<decltype(pri), std::priority_queue<double, std::vector<double>, std::greater<double>>>, "");
94 assert(pri.size() == v.size());
95 assert(pri.top() == 6);
96 }
97
98 {
99 std::vector<double> v{10, 6, 15, 28, 4, 18, 19};
100 std::deque<double> deq;
101 std::priority_queue pri(
102 v.begin(), v.end(), std::greater<double>(), deq); // priority_queue(Iter, Iter, Comp, Container)
103
104 static_assert(
105 std::is_same_v<decltype(pri), std::priority_queue<double, std::deque<double>, std::greater<double>>>, "");
106 assert(pri.size() == v.size());
107 assert(pri.top() == 4);
108 }
109
110 // Test the implicit deduction guides
111 {
112 // We don't expect this one to work - no way to implicitly get value_type
113 // std::priority_queue pri(std::allocator<int>()); // queue (allocator &)
114 }
115
116 {
117 std::priority_queue<float> source;
118 std::priority_queue pri(source); // priority_queue(priority_queue &)
119 static_assert(std::is_same_v<decltype(pri)::value_type, float>, "");
120 static_assert(std::is_same_v<decltype(pri)::container_type, std::vector<float>>, "");
121 assert(pri.size() == 0);
122 }
123
124 {
125 typedef short T;
126 typedef std::greater<T> Comp;
127 typedef test_allocator<T> Alloc;
128 typedef std::deque<T, Alloc> Cont;
129 typedef test_allocator<int> ConvertibleToAlloc;
130 static_assert(std::uses_allocator_v<Cont, ConvertibleToAlloc> &&
131 !std::is_same_v<typename Cont::allocator_type, ConvertibleToAlloc>);
132
133 {
134 Comp comp;
135 Cont cont;
136 std::priority_queue pri(comp, cont, Alloc(2));
137 static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
138 }
139
140 {
141 Comp comp;
142 Cont cont;
143 std::priority_queue pri(comp, cont, ConvertibleToAlloc(2));
144 static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
145 }
146
147 {
148 Comp comp;
149 Cont cont;
150 std::priority_queue pri(comp, std::move(cont), Alloc(2));
151 static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
152 }
153
154 {
155 Comp comp;
156 Cont cont;
157 std::priority_queue pri(comp, std::move(cont), ConvertibleToAlloc(2));
158 static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
159 }
160 }
161
162 {
163 typedef short T;
164 typedef signed char ConvertibleToT;
165 typedef std::greater<T> Comp;
166 typedef test_allocator<T> Alloc;
167 typedef std::deque<T, Alloc> Cont;
168 typedef test_allocator<int> ConvertibleToAlloc;
169 static_assert(std::uses_allocator_v<Cont, ConvertibleToAlloc> &&
170 !std::is_same_v<typename Cont::allocator_type, ConvertibleToAlloc>);
171
172 {
173 std::priority_queue<T, Cont, Comp> source;
174 std::priority_queue pri(source, Alloc(2));
175 static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
176 }
177
178 {
179 std::priority_queue<T, Cont, Comp> source;
180 std::priority_queue pri(source, ConvertibleToAlloc(2));
181 static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
182 }
183
184 {
185 std::priority_queue<T, Cont, Comp> source;
186 std::priority_queue pri(std::move(source), Alloc(2));
187 static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
188 }
189
190 {
191 std::priority_queue<T, Cont, Comp> source;
192 std::priority_queue pri(std::move(source), ConvertibleToAlloc(2));
193 static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
194 }
195
196 {
197 Cont cont;
198 std::priority_queue pri(Comp(), cont, Alloc(2));
199 static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
200 }
201
202 {
203 Cont cont;
204 std::priority_queue pri(Comp(), cont, ConvertibleToAlloc(2));
205 static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
206 }
207
208 {
209 Cont cont;
210 std::priority_queue pri(Comp(), std::move(cont), Alloc(2));
211 static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
212 }
213
214 {
215 Cont cont;
216 std::priority_queue pri(Comp(), std::move(cont), ConvertibleToAlloc(2));
217 static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
218 }
219
220 {
221 T a[2] = {};
222 std::priority_queue pri(a, a + 2, Alloc(2));
223 static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, std::vector<T, Alloc>>>);
224 }
225
226 {
227 T a[2] = {};
228 std::priority_queue pri(a, a + 2, Comp(), Alloc(2));
229 static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, std::vector<T, Alloc>, Comp>>);
230 }
231
232 {
233 Cont cont;
234 ConvertibleToT a[2] = {};
235 std::priority_queue pri(a, a + 2, Comp(), cont, Alloc(2));
236 static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
237 }
238
239 {
240 Cont cont;
241 ConvertibleToT a[2] = {};
242 std::priority_queue pri(a, a + 2, Comp(), cont, ConvertibleToAlloc(2));
243 static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
244 }
245
246 {
247 Cont cont;
248 ConvertibleToT a[2] = {};
249 std::priority_queue pri(a, a + 2, Comp(), std::move(cont), Alloc(2));
250 static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
251 }
252
253 {
254 Cont cont;
255 ConvertibleToT a[2] = {};
256 std::priority_queue pri(a, a + 2, Comp(), std::move(cont), ConvertibleToAlloc(2));
257 static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
258 }
259
260#if TEST_STD_VER >= 23
261 { // (from_range, range)
262 std::priority_queue c(std::from_range, Cont());
263 static_assert(std::is_same_v<decltype(c), std::priority_queue<T>>);
264 }
265
266 { // (from_range, range, compare)
267 std::priority_queue c(std::from_range, Cont(), Comp());
268 static_assert(std::is_same_v<decltype(c), std::priority_queue<T, std::vector<T>, Comp>>);
269 }
270
271 { // (from_range, range, compare, alloc)
272 std::priority_queue c(std::from_range, Cont(), Comp(), Alloc(2));
273 static_assert(std::is_same_v<decltype(c), std::priority_queue<T, std::vector<T, Alloc>, Comp>>);
274 }
275
276 { // (from_range, range, alloc)
277 std::priority_queue c(std::from_range, Cont(), Alloc(2));
278 static_assert(std::is_same_v<decltype(c), std::priority_queue<T, std::vector<T, Alloc>>>);
279 }
280#endif // TEST_STD_VER >= 23
281 }
282
283 // Deduction guides should be SFINAE'd away when given:
284 // - "bad" input iterators (that is, a type not qualifying as an input
285 // iterator);
286 // - a bad allocator;
287 // - an allocator instead of a comparator;
288 // - an allocator instead of a container;
289 // - an allocator and a container that uses a different allocator.
290 {
291 using Comp = std::less<int>;
292 using Cont = std::vector<int>;
293 using Alloc = std::allocator<int>;
294 using Iter = int*;
295
296 // The only requirement in the Standard is that integral types cannot be
297 // considered input iterators, beyond that it is unspecified.
298 using BadIter = int;
299#ifdef _LIBCPP_VERSION
300 struct OutputIter {
301 using iterator_category = std::output_iterator_tag;
302 using value_type = void;
303 using difference_type = void;
304 using pointer = void;
305 using reference = void;
306
307 const OutputIter& operator*() const { return *this; }
308 const OutputIter& operator++() { return *this; }
309 OutputIter operator++(int) const { return *this; }
310 };
311#endif // _LIBCPP_VERSION
312
313 struct BadAlloc {};
314 using AllocAsComp = Alloc;
315 using AllocAsCont = Alloc;
316 using DiffAlloc = test_allocator<int>;
317
318 // (iter, iter)
319 //
320 // Cannot deduce from (BAD_iter, BAD_iter)
321 static_assert(SFINAEs_away<std::priority_queue, BadIter, BadIter>);
322 // Note: (OutputIter, OutputIter) is interpreted as (comp, cont) and fails on accessing
323 // non-existent typedefs in `OutputIter` (as if it were a container). There is no
324 // requirement to SFINAE away bad containers.
325
326 // (iter, iter, comp)
327 //
328 // Cannot deduce from (BAD_iter, BAD_iter, comp)
329 static_assert(SFINAEs_away<std::priority_queue, BadIter, BadIter, Comp>);
330 LIBCPP_STATIC_ASSERT(SFINAEs_away<std::priority_queue, OutputIter, OutputIter, Comp>);
331 // Note: (iter, iter, ALLOC_as_comp) is allowed -- it just calls (iter, iter, alloc).
332
333 // (iter, iter, comp, cont)
334 //
335 // Cannot deduce from (BAD_iter, BAD_iter, comp, cont)
336 static_assert(SFINAEs_away<std::priority_queue, BadIter, BadIter, Comp, Cont>);
337 LIBCPP_STATIC_ASSERT(SFINAEs_away<std::priority_queue, OutputIter, OutputIter, Comp, Cont>);
338 // Cannot deduce from (iter, iter, ALLOC_as_comp, cont)
339 static_assert(SFINAEs_away<std::priority_queue, Iter, Iter, AllocAsComp, Cont>);
340 // Note: (iter, iter, comp, ALLOC_as_cont) is allowed -- it just calls (iter, iter, comp,
341 // alloc).
342
343 // (iter, iter, alloc)
344 //
345 // Cannot deduce from (BAD_iter, BAD_iter, alloc)
346 static_assert(SFINAEs_away<std::priority_queue, BadIter, BadIter, Alloc>);
347 LIBCPP_STATIC_ASSERT(SFINAEs_away<std::priority_queue, OutputIter, OutputIter, Alloc>);
348 // Note: (iter, iter, BAD_alloc) is interpreted as (iter, iter, comp) instead and fails upon
349 // instantiation. There is no requirement to SFINAE away bad comparators.
350
351 // (iter, iter, comp, alloc)
352 //
353 // Cannot deduce from (iter, iter, ALLOC_as_comp, alloc)
354 static_assert(SFINAEs_away<std::priority_queue, Iter, Iter, AllocAsComp, Alloc>);
355 // Note: (iter, iter, comp, BAD_alloc) is interpreted as (iter, iter, comp, cont) instead
356 // and fails upon instantiation. There is no requirement to SFINAE away bad containers.
357
358 // (iter, iter, comp, cont, alloc)
359 //
360 // Cannot deduce from (BAD_iter, BAD_iter, comp, cont, alloc)
361 static_assert(SFINAEs_away<std::priority_queue, BadIter, BadIter, Comp, Cont, Alloc>);
362 LIBCPP_STATIC_ASSERT(SFINAEs_away<std::priority_queue, OutputIter, OutputIter, Comp, Cont, Alloc>);
363 // Cannot deduce from (iter, iter, ALLOC_as_comp, cont, alloc)
364 static_assert(SFINAEs_away<std::priority_queue, Iter, Iter, AllocAsComp, Cont, Alloc>);
365 // Cannot deduce from (iter, iter, comp, ALLOC_as_cont, alloc)
366 static_assert(SFINAEs_away<std::priority_queue, Iter, Iter, Comp, AllocAsCont, Alloc>);
367 // Cannot deduce from (iter, iter, comp, cont, BAD_alloc)
368 static_assert(SFINAEs_away<std::priority_queue, Iter, Iter, Comp, Cont, BadAlloc>);
369 // Cannot deduce from (iter, iter, comp, cont, DIFFERENT_alloc)
370 static_assert(SFINAEs_away<std::priority_queue, Iter, Iter, Comp, Cont, DiffAlloc>);
371
372 // (comp, alloc)
373 //
374 // Cannot deduce from (ALLOC_as_comp, alloc)
375 static_assert(SFINAEs_away<std::priority_queue, AllocAsComp, Alloc>);
376 // Cannot deduce from (comp, BAD_alloc)
377 static_assert(SFINAEs_away<std::priority_queue, Comp, BadAlloc>);
378
379 // (comp, cont, alloc)
380 //
381 // Cannot deduce from (ALLOC_as_comp, cont, alloc)
382 static_assert(SFINAEs_away<std::priority_queue, AllocAsComp, Cont, Alloc>);
383 // Cannot deduce from (comp, ALLOC_as_cont, alloc)
384 static_assert(SFINAEs_away<std::priority_queue, Comp, AllocAsCont, Alloc>);
385 // Cannot deduce from (comp, cont, BAD_alloc)
386 static_assert(SFINAEs_away<std::priority_queue, Comp, Cont, BadAlloc>);
387 // Cannot deduce from (comp, cont, DIFFERENT_alloc)
388 static_assert(SFINAEs_away<std::priority_queue, Comp, Cont, DiffAlloc>);
389
390 // (comp, cont)
391 //
392 // Cannot deduce from (ALLOC_as_comp, cont)
393 static_assert(SFINAEs_away<std::priority_queue, AllocAsComp, Cont>);
394 // Cannot deduce from (comp, ALLOC_as_cont)
395 static_assert(SFINAEs_away<std::priority_queue, Comp, AllocAsCont>);
396
397#if TEST_STD_VER >= 23
398 using Range = RangeT<int>;
399 using BadRange = BadRangeT<int>;
400
401 // (from_range, range)
402 //
403 // Cannot deduce from (from_range, BAD_range)
404 static_assert(SFINAEs_away<std::priority_queue, BadRange>);
405
406 // (from_range, range, compare)
407 //
408 // Cannot deduce from (from_range, BAD_range, compare)
409 static_assert(SFINAEs_away<std::priority_queue, BadRange, Comp>);
410
411 // (from_range, range, compare, alloc)
412 //
413 // Cannot deduce from (from_range, BAD_range, compare, alloc)
414 static_assert(SFINAEs_away<std::priority_queue, BadRange, Comp, Alloc>);
415 // Cannot deduce from (from_range, range, compare, BAD_alloc)
416 static_assert(SFINAEs_away<std::priority_queue, Range, Comp, BadAlloc>);
417 // Cannot deduce from (from_range, range, compare, DIFFERENT_alloc)
418 static_assert(SFINAEs_away<std::priority_queue, Range, Comp, DiffAlloc>);
419
420 // (from_range, range, alloc)
421 //
422 // Cannot deduce from (from_range, BAD_range, alloc)
423 static_assert(SFINAEs_away<std::priority_queue, BadRange, Alloc>);
424 // Cannot deduce from (from_range, range, BAD_alloc)
425 static_assert(SFINAEs_away<std::priority_queue, Range, BadAlloc>);
426 // Cannot deduce from (from_range, range, DIFFERENT_alloc)
427 static_assert(SFINAEs_away<std::priority_queue, Range, DiffAlloc>);
428#endif // TEST_STD_VER >= 23
429 }
430
431 return 0;
432}
433

source code of libcxx/test/std/containers/container.adaptors/priority.queue/priqueue.cons/deduct.pass.cpp