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 #include <type_traits>
14 #include <memory>
15 #include <cassert>
16 #include "test_macros.h"
17
18 struct S
19 {
20 typedef short (*FreeFunc)(long);
21 operator FreeFunc() const;
22 double operator()(char, int&);
23 double const& operator()(char, int&) const;
24 double volatile& operator()(char, int&) volatile;
25 double const volatile& operator()(char, int&) const volatile;
26 };
27
28
29 struct SD : public S { };
30
31 struct NotDerived {};
32
33 template <class Tp>
34 struct Voider {
35 typedef void type;
36 };
37
38 template <class T, class = void>
39 struct HasType : std::false_type {};
40
41 template <class T>
42 struct HasType<T, typename Voider<typename T::type>::type> : std::true_type {};
43
44 #if TEST_STD_VER > 14
45 template <typename T, typename U>
46 struct test_invoke_result;
47
48 template <typename Fn, typename ...Args, typename Ret>
49 struct test_invoke_result<Fn(Args...), Ret>
50 {
calltest_invoke_result51 static void call()
52 {
53 static_assert(std::is_invocable<Fn, Args...>::value, "");
54 static_assert(std::is_invocable_r<Ret, Fn, Args...>::value, "");
55 ASSERT_SAME_TYPE(Ret, typename std::invoke_result<Fn, Args...>::type);
56 }
57 };
58 #endif
59
60 template <class T, class U>
test_result_of()61 void test_result_of()
62 {
63 ASSERT_SAME_TYPE(U, typename std::result_of<T>::type);
64 #if TEST_STD_VER > 14
65 test_invoke_result<T, U>::call();
66 #endif
67 }
68
69 #if TEST_STD_VER > 14
70 template <typename T>
71 struct test_invoke_no_result;
72
73 template <typename Fn, typename ...Args>
74 struct test_invoke_no_result<Fn(Args...)>
75 {
calltest_invoke_no_result76 static void call()
77 {
78 static_assert(std::is_invocable<Fn, Args...>::value == false, "");
79 static_assert((!HasType<std::invoke_result<Fn, Args...> >::value), "");
80 }
81 };
82 #endif
83
84 template <class T>
test_no_result()85 void test_no_result()
86 {
87 #if TEST_STD_VER >= 11
88 static_assert((!HasType<std::result_of<T> >::value), "");
89 #endif
90 #if TEST_STD_VER > 14
91 test_invoke_no_result<T>::call();
92 #endif
93 }
94
main(int,char **)95 int main(int, char**)
96 {
97 typedef NotDerived ND;
98 { // functor object
99 test_result_of<S(int), short> ();
100 test_result_of<S&(unsigned char, int&), double> ();
101 test_result_of<S const&(unsigned char, int&), double const &> ();
102 test_result_of<S volatile&(unsigned char, int&), double volatile&> ();
103 test_result_of<S const volatile&(unsigned char, int&), double const volatile&> ();
104 }
105 { // pointer to function
106 typedef bool (&RF0)();
107 typedef bool* (&RF1)(int);
108 typedef bool& (&RF2)(int, int);
109 typedef bool const& (&RF3)(int, int, int);
110 typedef bool (&RF4)(int, ...);
111 typedef bool (*PF0)();
112 typedef bool* (*PF1)(int);
113 typedef bool& (*PF2)(int, int);
114 typedef bool const& (*PF3)(int, int, int);
115 typedef bool (*PF4)(int, ...);
116 typedef bool (*&PRF0)();
117 typedef bool* (*&PRF1)(int);
118 typedef bool& (*&PRF2)(int, int);
119 typedef bool const& (*&PRF3)(int, int, int);
120 typedef bool (*&PRF4)(int, ...);
121 test_result_of<RF0(), bool>();
122 test_result_of<RF1(int), bool*>();
123 test_result_of<RF2(int, long), bool&>();
124 test_result_of<RF3(int, long, int), bool const&>();
125 test_result_of<RF4(int, float, void*), bool>();
126 test_result_of<PF0(), bool>();
127 test_result_of<PF1(int), bool*>();
128 test_result_of<PF2(int, long), bool&>();
129 test_result_of<PF3(int, long, int), bool const&>();
130 test_result_of<PF4(int, float, void*), bool>();
131 test_result_of<PRF0(), bool>();
132 test_result_of<PRF1(int), bool*>();
133 test_result_of<PRF2(int, long), bool&>();
134 test_result_of<PRF3(int, long, int), bool const&>();
135 test_result_of<PRF4(int, float, void*), bool>();
136 }
137 { // pointer to member function
138
139 typedef int (S::*PMS0)();
140 typedef int* (S::*PMS1)(long);
141 typedef int& (S::*PMS2)(long, int);
142 typedef const int& (S::*PMS3)(int, ...);
143 test_result_of<PMS0( S), int> ();
144 test_result_of<PMS0( S&), int> ();
145 test_result_of<PMS0( S*), int> ();
146 test_result_of<PMS0( S*&), int> ();
147 test_result_of<PMS0( std::reference_wrapper<S>), int> ();
148 test_result_of<PMS0(const std::reference_wrapper<S>&), int> ();
149 test_result_of<PMS0( std::reference_wrapper<SD>), int> ();
150 test_result_of<PMS0(const std::reference_wrapper<SD>&), int> ();
151 test_result_of<PMS0(std::unique_ptr<S>), int> ();
152 test_result_of<PMS0(std::unique_ptr<SD>), int> ();
153 test_no_result<PMS0(const S&)>();
154 test_no_result<PMS0(volatile S&)>();
155 test_no_result<PMS0(const volatile S&)>();
156 test_no_result<PMS0(ND & )>();
157 test_no_result<PMS0(const ND& )>();
158 test_no_result<PMS0(std::unique_ptr<S const> )>();
159 test_no_result<PMS0(std::reference_wrapper<S const>)>();
160 test_no_result<PMS0(std::reference_wrapper<ND> )>();
161 test_no_result<PMS0(std::unique_ptr<ND> )>();
162
163 test_result_of<PMS1( S, int), int*> ();
164 test_result_of<PMS1( S&, int), int*> ();
165 test_result_of<PMS1( S*, int), int*> ();
166 test_result_of<PMS1( S*&, int), int*> ();
167 test_result_of<PMS1(std::unique_ptr<S>, int), int*> ();
168 test_result_of<PMS1(std::unique_ptr<SD>, int), int*> ();
169 test_result_of<PMS1(std::reference_wrapper<S>, int), int*> ();
170 test_result_of<PMS1(const std::reference_wrapper<S>&, int), int*> ();
171 test_result_of<PMS1(std::reference_wrapper<SD>, int), int*> ();
172 test_result_of<PMS1(const std::reference_wrapper<SD>&, int), int*> ();
173 test_no_result<PMS1(const S&, int)>();
174 test_no_result<PMS1(volatile S&, int)>();
175 test_no_result<PMS1(const volatile S&, int)>();
176 test_no_result<PMS1(ND &, int)>();
177 test_no_result<PMS1(const ND&, int)>();
178 test_no_result<PMS1(std::unique_ptr<S const>, int)>();
179 test_no_result<PMS1(std::reference_wrapper<S const>, int)>();
180 test_no_result<PMS1(std::reference_wrapper<ND>, int)>();
181 test_no_result<PMS1(std::unique_ptr<ND>, int)>();
182
183 test_result_of<PMS2( S, int, int), int&> ();
184 test_result_of<PMS2( S&, int, int), int&> ();
185 test_result_of<PMS2( S*, int, int), int&> ();
186 test_result_of<PMS2( S*&, int, int), int&> ();
187 test_result_of<PMS2(std::unique_ptr<S>, int, int), int&> ();
188 test_result_of<PMS2(std::unique_ptr<SD>, int, int), int&> ();
189 test_result_of<PMS2(std::reference_wrapper<S>, int, int), int&> ();
190 test_result_of<PMS2(const std::reference_wrapper<S>&, int, int), int&> ();
191 test_result_of<PMS2(std::reference_wrapper<SD>, int, int), int&> ();
192 test_result_of<PMS2(const std::reference_wrapper<SD>&, int, int), int&> ();
193 test_no_result<PMS2(const S&, int, int)>();
194 test_no_result<PMS2(volatile S&, int, int)>();
195 test_no_result<PMS2(const volatile S&, int, int)>();
196 test_no_result<PMS2(std::unique_ptr<S const>, int, int)>();
197 test_no_result<PMS2(std::reference_wrapper<S const>, int, int)>();
198 test_no_result<PMS2(const ND&, int, int)>();
199 test_no_result<PMS2(std::reference_wrapper<ND>, int, int)>();
200 test_no_result<PMS2(std::unique_ptr<ND>, int, int)>();
201
202 test_result_of<PMS3(S&, int), const int &>();
203 test_result_of<PMS3(S&, int, long), const int &>();
204
205 typedef int (S::*PMS0C)() const;
206 typedef int* (S::*PMS1C)(long) const;
207 typedef int& (S::*PMS2C)(long, int) const;
208 typedef const int& (S::*PMS3C)(int, ...) const;
209 test_result_of<PMS0C( S), int> ();
210 test_result_of<PMS0C( S&), int> ();
211 test_result_of<PMS0C(const S&), int> ();
212 test_result_of<PMS0C( S*), int> ();
213 test_result_of<PMS0C(const S*), int> ();
214 test_result_of<PMS0C( S*&), int> ();
215 test_result_of<PMS0C(const S*&), int> ();
216 test_result_of<PMS0C(std::unique_ptr<S>), int> ();
217 test_result_of<PMS0C(std::unique_ptr<SD>), int> ();
218 test_result_of<PMS0C(std::reference_wrapper<S> ), int> ();
219 test_result_of<PMS0C(std::reference_wrapper<const S> ), int> ();
220 test_result_of<PMS0C(const std::reference_wrapper<S> & ), int> ();
221 test_result_of<PMS0C(const std::reference_wrapper<const S> &), int> ();
222 test_result_of<PMS0C(std::reference_wrapper<SD> ), int> ();
223 test_result_of<PMS0C(std::reference_wrapper<const SD> ), int> ();
224 test_result_of<PMS0C(const std::reference_wrapper<SD> & ), int> ();
225 test_result_of<PMS0C(const std::reference_wrapper<const SD> &), int> ();
226 test_no_result<PMS0C(volatile S&)>();
227 test_no_result<PMS0C(const volatile S&)>();
228
229 test_result_of<PMS1C( S, int), int*> ();
230 test_result_of<PMS1C( S&, int), int*> ();
231 test_result_of<PMS1C(const S&, int), int*> ();
232 test_result_of<PMS1C( S*, int), int*> ();
233 test_result_of<PMS1C(const 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(std::unique_ptr<S>, int), int*> ();
237 test_no_result<PMS1C(volatile S&, int)>();
238 test_no_result<PMS1C(const volatile S&, int)>();
239
240 test_result_of<PMS2C( S, int, int), int&> ();
241 test_result_of<PMS2C( S&, int, int), int&> ();
242 test_result_of<PMS2C(const S&, int, int), int&> ();
243 test_result_of<PMS2C( S*, int, int), int&> ();
244 test_result_of<PMS2C(const 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(std::unique_ptr<S>, int, int), int&> ();
248 test_no_result<PMS2C(volatile S&, int, int)>();
249 test_no_result<PMS2C(const volatile S&, int, int)>();
250
251 test_result_of<PMS3C(S&, int), const int &>();
252 test_result_of<PMS3C(S&, int, long), const int &>();
253
254 typedef int (S::*PMS0V)() volatile;
255 typedef int* (S::*PMS1V)(long) volatile;
256 typedef int& (S::*PMS2V)(long, int) volatile;
257 typedef const int& (S::*PMS3V)(int, ...) volatile;
258 test_result_of<PMS0V( S), int> ();
259 test_result_of<PMS0V( S&), int> ();
260 test_result_of<PMS0V(volatile S&), int> ();
261 test_result_of<PMS0V( S*), int> ();
262 test_result_of<PMS0V(volatile S*), int> ();
263 test_result_of<PMS0V( S*&), int> ();
264 test_result_of<PMS0V(volatile S*&), int> ();
265 test_result_of<PMS0V(std::unique_ptr<S>), int> ();
266 test_no_result<PMS0V(const S&)>();
267 test_no_result<PMS0V(const volatile S&)>();
268
269 test_result_of<PMS1V( S, int), int*> ();
270 test_result_of<PMS1V( S&, int), int*> ();
271 test_result_of<PMS1V(volatile S&, int), int*> ();
272 test_result_of<PMS1V( S*, int), int*> ();
273 test_result_of<PMS1V(volatile 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(std::unique_ptr<S>, int), int*> ();
277 test_no_result<PMS1V(const S&, int)>();
278 test_no_result<PMS1V(const volatile S&, int)>();
279
280 test_result_of<PMS2V( S, int, int), int&> ();
281 test_result_of<PMS2V( S&, int, int), int&> ();
282 test_result_of<PMS2V(volatile S&, int, int), int&> ();
283 test_result_of<PMS2V( S*, int, int), int&> ();
284 test_result_of<PMS2V(volatile 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(std::unique_ptr<S>, int, int), int&> ();
288 test_no_result<PMS2V(const S&, int, int)>();
289 test_no_result<PMS2V(const volatile S&, int, int)>();
290
291 test_result_of<PMS3V(S&, int), const int &>();
292 test_result_of<PMS3V(S&, int, long), const int &>();
293
294 typedef int (S::*PMS0CV)() const volatile;
295 typedef int* (S::*PMS1CV)(long) const volatile;
296 typedef int& (S::*PMS2CV)(long, int) const volatile;
297 typedef const int& (S::*PMS3CV)(int, ...) const volatile;
298 test_result_of<PMS0CV( S), int> ();
299 test_result_of<PMS0CV( S&), int> ();
300 test_result_of<PMS0CV(const S&), int> ();
301 test_result_of<PMS0CV(volatile S&), int> ();
302 test_result_of<PMS0CV(const volatile 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(std::unique_ptr<S>), int> ();
312
313 test_result_of<PMS1CV( S, int), int*> ();
314 test_result_of<PMS1CV( S&, int), int*> ();
315 test_result_of<PMS1CV(const S&, int), int*> ();
316 test_result_of<PMS1CV(volatile S&, int), int*> ();
317 test_result_of<PMS1CV(const volatile 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(std::unique_ptr<S>, int), int*> ();
327
328 test_result_of<PMS2CV( S, int, int), int&> ();
329 test_result_of<PMS2CV( S&, int, int), int&> ();
330 test_result_of<PMS2CV(const S&, int, int), int&> ();
331 test_result_of<PMS2CV(volatile S&, int, int), int&> ();
332 test_result_of<PMS2CV(const volatile 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(std::unique_ptr<S>, int, int), int&> ();
342
343 test_result_of<PMS3CV(S&, int), const int &>();
344 test_result_of<PMS3CV(S&, int, long), const int &>();
345 }
346 { // pointer to member data
347 typedef char S::*PMD;
348 test_result_of<PMD(S&), char &>();
349 test_result_of<PMD(S*), char &>();
350 test_result_of<PMD(S* const), char &>();
351 test_result_of<PMD(const S&), const char&> ();
352 test_result_of<PMD(const S*), const char&> ();
353 test_result_of<PMD(volatile S&), volatile char&> ();
354 test_result_of<PMD(volatile S*), volatile char&> ();
355 test_result_of<PMD(const volatile S&), const volatile char&> ();
356 test_result_of<PMD(const volatile S*), const volatile char&> ();
357 test_result_of<PMD(SD&), char &>();
358 test_result_of<PMD(SD const&), const char&>();
359 test_result_of<PMD(SD*), char&>();
360 test_result_of<PMD(const SD*), const char&>();
361 test_result_of<PMD(std::unique_ptr<S>), char &>();
362 test_result_of<PMD(std::unique_ptr<S const>), const char&>();
363 #if TEST_STD_VER >= 11
364 test_result_of<PMD(std::reference_wrapper<S>), char&>();
365 test_result_of<PMD(std::reference_wrapper<S const>), const char&>();
366 #endif
367 test_no_result<PMD(ND&)>();
368 }
369
370 return 0;
371 }
372