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 // <functional>
10
11 // result_of<Fn(ArgTypes...)>
12
13 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS
14 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
15
16 #include <type_traits>
17 #include <cassert>
18 #include <functional>
19 #include <memory>
20 #include "test_macros.h"
21
22 struct S
23 {
24 typedef short (*FreeFunc)(long);
25 operator FreeFunc() const;
26 double operator()(char, int&);
27 double const& operator()(char, int&) const;
28 double volatile& operator()(char, int&) volatile;
29 double const volatile& operator()(char, int&) const volatile;
30 };
31
32
33 struct SD : public S { };
34
35 struct NotDerived {};
36
37 template <class Tp>
38 struct Voider {
39 typedef void type;
40 };
41
42 template <class T, class = void>
43 struct HasType : std::false_type {};
44
45 template <class T>
46 struct HasType<T, typename Voider<typename T::type>::type> : std::true_type {};
47
48 #if TEST_STD_VER > 14
49 template <typename T, typename U>
50 struct test_invoke_result;
51
52 template <typename Fn, typename ...Args, typename Ret>
53 struct test_invoke_result<Fn(Args...), Ret>
54 {
calltest_invoke_result55 static void call()
56 {
57 static_assert(std::is_invocable<Fn, Args...>::value, "");
58 static_assert(std::is_invocable_r<Ret, Fn, Args...>::value, "");
59 ASSERT_SAME_TYPE(Ret, typename std::invoke_result<Fn, Args...>::type);
60 }
61 };
62 #endif
63
64 template <class T, class U>
test_result_of()65 void test_result_of()
66 {
67 ASSERT_SAME_TYPE(U, typename std::result_of<T>::type);
68 #if TEST_STD_VER > 14
69 test_invoke_result<T, U>::call();
70 #endif
71 }
72
73 #if TEST_STD_VER > 14
74 template <typename T>
75 struct test_invoke_no_result;
76
77 template <typename Fn, typename ...Args>
78 struct test_invoke_no_result<Fn(Args...)>
79 {
calltest_invoke_no_result80 static void call()
81 {
82 static_assert(std::is_invocable<Fn, Args...>::value == false, "");
83 static_assert((!HasType<std::invoke_result<Fn, Args...> >::value), "");
84 }
85 };
86 #endif
87
88 template <class T>
test_no_result()89 void test_no_result()
90 {
91 #if TEST_STD_VER >= 11
92 static_assert((!HasType<std::result_of<T> >::value), "");
93 #endif
94 #if TEST_STD_VER > 14
95 test_invoke_no_result<T>::call();
96 #endif
97 }
98
main(int,char **)99 int main(int, char**)
100 {
101 typedef NotDerived ND;
102 { // functor object
103 test_result_of<S(int), short> ();
104 test_result_of<S&(unsigned char, int&), double> ();
105 test_result_of<S const&(unsigned char, int&), double const &> ();
106 test_result_of<S volatile&(unsigned char, int&), double volatile&> ();
107 test_result_of<S const volatile&(unsigned char, int&), double const volatile&> ();
108 }
109 { // pointer to function
110 typedef bool (&RF0)();
111 typedef bool* (&RF1)(int);
112 typedef bool& (&RF2)(int, int);
113 typedef bool const& (&RF3)(int, int, int);
114 typedef bool (&RF4)(int, ...);
115 typedef bool (*PF0)();
116 typedef bool* (*PF1)(int);
117 typedef bool& (*PF2)(int, int);
118 typedef bool const& (*PF3)(int, int, int);
119 typedef bool (*PF4)(int, ...);
120 typedef bool (*&PRF0)();
121 typedef bool* (*&PRF1)(int);
122 typedef bool& (*&PRF2)(int, int);
123 typedef bool const& (*&PRF3)(int, int, int);
124 typedef bool (*&PRF4)(int, ...);
125 test_result_of<RF0(), bool>();
126 test_result_of<RF1(int), bool*>();
127 test_result_of<RF2(int, long), bool&>();
128 test_result_of<RF3(int, long, int), bool const&>();
129 test_result_of<RF4(int, float, void*), bool>();
130 test_result_of<PF0(), bool>();
131 test_result_of<PF1(int), bool*>();
132 test_result_of<PF2(int, long), bool&>();
133 test_result_of<PF3(int, long, int), bool const&>();
134 test_result_of<PF4(int, float, void*), bool>();
135 test_result_of<PRF0(), bool>();
136 test_result_of<PRF1(int), bool*>();
137 test_result_of<PRF2(int, long), bool&>();
138 test_result_of<PRF3(int, long, int), bool const&>();
139 test_result_of<PRF4(int, float, void*), bool>();
140 }
141 { // pointer to member function
142
143 typedef int (S::*PMS0)();
144 typedef int* (S::*PMS1)(long);
145 typedef int& (S::*PMS2)(long, int);
146 typedef const int& (S::*PMS3)(int, ...);
147 test_result_of<PMS0( S), int> ();
148 test_result_of<PMS0( S&), int> ();
149 test_result_of<PMS0( S*), int> ();
150 test_result_of<PMS0( S*&), int> ();
151 test_result_of<PMS0( std::reference_wrapper<S>), int> ();
152 test_result_of<PMS0(const std::reference_wrapper<S>&), int> ();
153 test_result_of<PMS0( std::reference_wrapper<SD>), int> ();
154 test_result_of<PMS0(const std::reference_wrapper<SD>&), int> ();
155 test_result_of<PMS0(std::unique_ptr<S>), int> ();
156 test_result_of<PMS0(std::unique_ptr<SD>), int> ();
157 test_no_result<PMS0(const S&)>();
158 test_no_result<PMS0(volatile S&)>();
159 test_no_result<PMS0(const volatile S&)>();
160 test_no_result<PMS0(ND & )>();
161 test_no_result<PMS0(const ND& )>();
162 test_no_result<PMS0(std::unique_ptr<S const> )>();
163 test_no_result<PMS0(std::reference_wrapper<S const>)>();
164 test_no_result<PMS0(std::reference_wrapper<ND> )>();
165 test_no_result<PMS0(std::unique_ptr<ND> )>();
166
167 test_result_of<PMS1( S, int), int*> ();
168 test_result_of<PMS1( S&, int), int*> ();
169 test_result_of<PMS1( S*, int), int*> ();
170 test_result_of<PMS1( S*&, int), int*> ();
171 test_result_of<PMS1(std::unique_ptr<S>, int), int*> ();
172 test_result_of<PMS1(std::unique_ptr<SD>, int), int*> ();
173 test_result_of<PMS1(std::reference_wrapper<S>, int), int*> ();
174 test_result_of<PMS1(const std::reference_wrapper<S>&, int), int*> ();
175 test_result_of<PMS1(std::reference_wrapper<SD>, int), int*> ();
176 test_result_of<PMS1(const std::reference_wrapper<SD>&, int), int*> ();
177 test_no_result<PMS1(const S&, int)>();
178 test_no_result<PMS1(volatile S&, int)>();
179 test_no_result<PMS1(const volatile S&, int)>();
180 test_no_result<PMS1(ND &, int)>();
181 test_no_result<PMS1(const ND&, int)>();
182 test_no_result<PMS1(std::unique_ptr<S const>, int)>();
183 test_no_result<PMS1(std::reference_wrapper<S const>, int)>();
184 test_no_result<PMS1(std::reference_wrapper<ND>, int)>();
185 test_no_result<PMS1(std::unique_ptr<ND>, int)>();
186
187 test_result_of<PMS2( S, int, int), int&> ();
188 test_result_of<PMS2( S&, int, int), int&> ();
189 test_result_of<PMS2( S*, int, int), int&> ();
190 test_result_of<PMS2( S*&, int, int), int&> ();
191 test_result_of<PMS2(std::unique_ptr<S>, int, int), int&> ();
192 test_result_of<PMS2(std::unique_ptr<SD>, int, int), int&> ();
193 test_result_of<PMS2(std::reference_wrapper<S>, int, int), int&> ();
194 test_result_of<PMS2(const std::reference_wrapper<S>&, int, int), int&> ();
195 test_result_of<PMS2(std::reference_wrapper<SD>, int, int), int&> ();
196 test_result_of<PMS2(const std::reference_wrapper<SD>&, int, int), int&> ();
197 test_no_result<PMS2(const S&, int, int)>();
198 test_no_result<PMS2(volatile S&, int, int)>();
199 test_no_result<PMS2(const volatile S&, int, int)>();
200 test_no_result<PMS2(std::unique_ptr<S const>, int, int)>();
201 test_no_result<PMS2(std::reference_wrapper<S const>, int, int)>();
202 test_no_result<PMS2(const ND&, int, int)>();
203 test_no_result<PMS2(std::reference_wrapper<ND>, int, int)>();
204 test_no_result<PMS2(std::unique_ptr<ND>, int, int)>();
205
206 test_result_of<PMS3(S&, int), const int &>();
207 test_result_of<PMS3(S&, int, long), const int &>();
208
209 typedef int (S::*PMS0C)() const;
210 typedef int* (S::*PMS1C)(long) const;
211 typedef int& (S::*PMS2C)(long, int) const;
212 typedef const int& (S::*PMS3C)(int, ...) const;
213 test_result_of<PMS0C( S), int> ();
214 test_result_of<PMS0C( S&), int> ();
215 test_result_of<PMS0C(const S&), int> ();
216 test_result_of<PMS0C( S*), int> ();
217 test_result_of<PMS0C(const S*), int> ();
218 test_result_of<PMS0C( S*&), int> ();
219 test_result_of<PMS0C(const S*&), int> ();
220 test_result_of<PMS0C(std::unique_ptr<S>), int> ();
221 test_result_of<PMS0C(std::unique_ptr<SD>), int> ();
222 test_result_of<PMS0C(std::reference_wrapper<S> ), int> ();
223 test_result_of<PMS0C(std::reference_wrapper<const S> ), int> ();
224 test_result_of<PMS0C(const std::reference_wrapper<S> & ), int> ();
225 test_result_of<PMS0C(const std::reference_wrapper<const S> &), int> ();
226 test_result_of<PMS0C(std::reference_wrapper<SD> ), int> ();
227 test_result_of<PMS0C(std::reference_wrapper<const SD> ), int> ();
228 test_result_of<PMS0C(const std::reference_wrapper<SD> & ), int> ();
229 test_result_of<PMS0C(const std::reference_wrapper<const SD> &), int> ();
230 test_no_result<PMS0C(volatile S&)>();
231 test_no_result<PMS0C(const volatile S&)>();
232
233 test_result_of<PMS1C( S, int), int*> ();
234 test_result_of<PMS1C( S&, int), int*> ();
235 test_result_of<PMS1C(const S&, int), int*> ();
236 test_result_of<PMS1C( S*, int), int*> ();
237 test_result_of<PMS1C(const S*, int), int*> ();
238 test_result_of<PMS1C( S*&, int), int*> ();
239 test_result_of<PMS1C(const S*&, int), int*> ();
240 test_result_of<PMS1C(std::unique_ptr<S>, int), int*> ();
241 test_no_result<PMS1C(volatile S&, int)>();
242 test_no_result<PMS1C(const volatile S&, int)>();
243
244 test_result_of<PMS2C( S, int, int), int&> ();
245 test_result_of<PMS2C( S&, int, int), int&> ();
246 test_result_of<PMS2C(const S&, int, int), int&> ();
247 test_result_of<PMS2C( S*, int, int), int&> ();
248 test_result_of<PMS2C(const S*, int, int), int&> ();
249 test_result_of<PMS2C( S*&, int, int), int&> ();
250 test_result_of<PMS2C(const S*&, int, int), int&> ();
251 test_result_of<PMS2C(std::unique_ptr<S>, int, int), int&> ();
252 test_no_result<PMS2C(volatile S&, int, int)>();
253 test_no_result<PMS2C(const volatile S&, int, int)>();
254
255 test_result_of<PMS3C(S&, int), const int &>();
256 test_result_of<PMS3C(S&, int, long), const int &>();
257
258 typedef int (S::*PMS0V)() volatile;
259 typedef int* (S::*PMS1V)(long) volatile;
260 typedef int& (S::*PMS2V)(long, int) volatile;
261 typedef const int& (S::*PMS3V)(int, ...) volatile;
262 test_result_of<PMS0V( S), int> ();
263 test_result_of<PMS0V( S&), int> ();
264 test_result_of<PMS0V(volatile S&), int> ();
265 test_result_of<PMS0V( S*), int> ();
266 test_result_of<PMS0V(volatile S*), int> ();
267 test_result_of<PMS0V( S*&), int> ();
268 test_result_of<PMS0V(volatile S*&), int> ();
269 test_result_of<PMS0V(std::unique_ptr<S>), int> ();
270 test_no_result<PMS0V(const S&)>();
271 test_no_result<PMS0V(const volatile S&)>();
272
273 test_result_of<PMS1V( S, int), int*> ();
274 test_result_of<PMS1V( S&, int), int*> ();
275 test_result_of<PMS1V(volatile S&, int), int*> ();
276 test_result_of<PMS1V( S*, int), int*> ();
277 test_result_of<PMS1V(volatile S*, int), int*> ();
278 test_result_of<PMS1V( S*&, int), int*> ();
279 test_result_of<PMS1V(volatile S*&, int), int*> ();
280 test_result_of<PMS1V(std::unique_ptr<S>, int), int*> ();
281 test_no_result<PMS1V(const S&, int)>();
282 test_no_result<PMS1V(const volatile S&, int)>();
283
284 test_result_of<PMS2V( S, int, int), int&> ();
285 test_result_of<PMS2V( S&, int, int), int&> ();
286 test_result_of<PMS2V(volatile S&, int, int), int&> ();
287 test_result_of<PMS2V( S*, int, int), int&> ();
288 test_result_of<PMS2V(volatile S*, int, int), int&> ();
289 test_result_of<PMS2V( S*&, int, int), int&> ();
290 test_result_of<PMS2V(volatile S*&, int, int), int&> ();
291 test_result_of<PMS2V(std::unique_ptr<S>, int, int), int&> ();
292 test_no_result<PMS2V(const S&, int, int)>();
293 test_no_result<PMS2V(const volatile S&, int, int)>();
294
295 test_result_of<PMS3V(S&, int), const int &>();
296 test_result_of<PMS3V(S&, int, long), const int &>();
297
298 typedef int (S::*PMS0CV)() const volatile;
299 typedef int* (S::*PMS1CV)(long) const volatile;
300 typedef int& (S::*PMS2CV)(long, int) const volatile;
301 typedef const int& (S::*PMS3CV)(int, ...) const volatile;
302 test_result_of<PMS0CV( S), int> ();
303 test_result_of<PMS0CV( S&), int> ();
304 test_result_of<PMS0CV(const S&), int> ();
305 test_result_of<PMS0CV(volatile S&), int> ();
306 test_result_of<PMS0CV(const volatile S&), int> ();
307 test_result_of<PMS0CV( S*), int> ();
308 test_result_of<PMS0CV(const S*), int> ();
309 test_result_of<PMS0CV(volatile S*), int> ();
310 test_result_of<PMS0CV(const volatile S*), int> ();
311 test_result_of<PMS0CV( S*&), int> ();
312 test_result_of<PMS0CV(const S*&), int> ();
313 test_result_of<PMS0CV(volatile S*&), int> ();
314 test_result_of<PMS0CV(const volatile S*&), int> ();
315 test_result_of<PMS0CV(std::unique_ptr<S>), int> ();
316
317 test_result_of<PMS1CV( S, int), int*> ();
318 test_result_of<PMS1CV( S&, int), int*> ();
319 test_result_of<PMS1CV(const S&, int), int*> ();
320 test_result_of<PMS1CV(volatile S&, int), int*> ();
321 test_result_of<PMS1CV(const volatile S&, int), int*> ();
322 test_result_of<PMS1CV( S*, int), int*> ();
323 test_result_of<PMS1CV(const S*, int), int*> ();
324 test_result_of<PMS1CV(volatile S*, int), int*> ();
325 test_result_of<PMS1CV(const volatile S*, int), int*> ();
326 test_result_of<PMS1CV( S*&, int), int*> ();
327 test_result_of<PMS1CV(const S*&, int), int*> ();
328 test_result_of<PMS1CV(volatile S*&, int), int*> ();
329 test_result_of<PMS1CV(const volatile S*&, int), int*> ();
330 test_result_of<PMS1CV(std::unique_ptr<S>, int), int*> ();
331
332 test_result_of<PMS2CV( S, int, int), int&> ();
333 test_result_of<PMS2CV( S&, int, int), int&> ();
334 test_result_of<PMS2CV(const S&, int, int), int&> ();
335 test_result_of<PMS2CV(volatile S&, int, int), int&> ();
336 test_result_of<PMS2CV(const volatile S&, int, int), int&> ();
337 test_result_of<PMS2CV( S*, int, int), int&> ();
338 test_result_of<PMS2CV(const S*, int, int), int&> ();
339 test_result_of<PMS2CV(volatile S*, int, int), int&> ();
340 test_result_of<PMS2CV(const volatile S*, int, int), int&> ();
341 test_result_of<PMS2CV( S*&, int, int), int&> ();
342 test_result_of<PMS2CV(const S*&, int, int), int&> ();
343 test_result_of<PMS2CV(volatile S*&, int, int), int&> ();
344 test_result_of<PMS2CV(const volatile S*&, int, int), int&> ();
345 test_result_of<PMS2CV(std::unique_ptr<S>, int, int), int&> ();
346
347 test_result_of<PMS3CV(S&, int), const int &>();
348 test_result_of<PMS3CV(S&, int, long), const int &>();
349 }
350 { // pointer to member data
351 typedef char S::*PMD;
352 test_result_of<PMD(S&), char &>();
353 test_result_of<PMD(S*), char &>();
354 test_result_of<PMD(S* const), char &>();
355 test_result_of<PMD(const S&), const char&> ();
356 test_result_of<PMD(const S*), const char&> ();
357 test_result_of<PMD(volatile S&), volatile char&> ();
358 test_result_of<PMD(volatile S*), volatile char&> ();
359 test_result_of<PMD(const volatile S&), const volatile char&> ();
360 test_result_of<PMD(const volatile S*), const volatile char&> ();
361 test_result_of<PMD(SD&), char &>();
362 test_result_of<PMD(SD const&), const char&>();
363 test_result_of<PMD(SD*), char&>();
364 test_result_of<PMD(const SD*), const char&>();
365 test_result_of<PMD(std::unique_ptr<S>), char &>();
366 test_result_of<PMD(std::unique_ptr<S const>), const char&>();
367 #if TEST_STD_VER >= 11
368 test_result_of<PMD(std::reference_wrapper<S>), char&>();
369 test_result_of<PMD(std::reference_wrapper<S const>), const char&>();
370 #endif
371 test_no_result<PMD(ND&)>();
372 }
373
374 return 0;
375 }
376