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
10
11 // <functional>
12
13 // class function<R(ArgTypes...)>
14
15 // function(Fp);
16
17 // Ensure that __not_null works for all function types.
18 // See https://llvm.org/PR23589
19
20 //------------------------------------------------------------------------------
21 // TESTING std::function<...>::__not_null(Callable)
22 //
23 // Concerns:
24 // 1) The call __not_null(Callable) is well formed and correct for each
25 // possible 'Callable' type category. These categories include:
26 // 1a) function pointers
27 // 1b) member function pointer
28 // 1c) member data pointer
29 // 1d) callable class type
30 // 1e) lambdas
31 // Categories 1a, 1b, and 1c are 'Nullable' types. Only objects of these
32 // types can be null. The other categories are not tested here.
33 // 3) '__not_null(Callable)' is well formed when the call signature includes
34 // varargs.
35 // 4) '__not_null(Callable)' works for Callable types with all arities less
36 // than or equal to 3 in C++03.
37 // 5) '__not_null(Callable)' works when 'Callable' is a member function
38 // pointer to a cv or ref qualified function type.
39 //
40 // Plan:
41 // 1 For categories 1a, 1b and 1c define a set of
42 // 'Callable' objects for this category. This set should include examples
43 // of arity 0, 1, 2 and possible 3 including versions with varargs as the
44 // last parameter.
45 //
46 // 2 For each 'Callable' object in categories 1a, 1b and 1c do the following.
47 //
48 // 1 Define a type 'std::function<Sig>' as 'F' where 'Sig' is compatible with
49 // the signature of the 'Callable' object.
50 //
51 // 2 Create an object of type 'F' using a null pointer of type 'Callable'.
52 // Check that 'F.target<Callable>()' is null.
53 //
54 // 3 Create an object of type 'F' that is not null. Check that
55 // 'F.target<Callable>()' is not null and is equal to the original
56 // argument.
57
58 #include <functional>
59 #include <type_traits>
60 #include <cassert>
61
62 #include "test_macros.h"
63
64 ///////////////////////////////////////////////////////////////////////////////
foo()65 int foo() { return 42; }
foo(int)66 int foo(int) { return 42; }
foo(int,int)67 int foo(int, int) { return 42; }
foo(int,int,int)68 int foo(int, int, int) { return 42; }
69
foo(...)70 int foo(...) { return 42; }
foo(int,...)71 int foo(int, ...) { return 42; }
foo(int,int,...)72 int foo(int, int, ...) { return 42; }
foo(int,int,int,...)73 int foo(int, int, int, ...) { return 42; }
74
75 ///////////////////////////////////////////////////////////////////////////////
76 struct MemFun03 {
fooMemFun0377 int foo() { return 42; }
fooMemFun0378 int foo() const { return 42; }
fooMemFun0379 int foo() volatile { return 42; }
fooMemFun0380 int foo() const volatile { return 42; }
81
fooMemFun0382 int foo(int) { return 42; }
fooMemFun0383 int foo(int) const { return 42; }
fooMemFun0384 int foo(int) volatile { return 42; }
fooMemFun0385 int foo(int) const volatile { return 42; }
86
fooMemFun0387 int foo(int, int) { return 42; }
fooMemFun0388 int foo(int, int) const { return 42; }
fooMemFun0389 int foo(int, int) volatile { return 42; }
fooMemFun0390 int foo(int, int) const volatile { return 42; }
91
fooMemFun0392 int foo(int, int, int) { return 42; }
fooMemFun0393 int foo(int, int, int) const { return 42; }
fooMemFun0394 int foo(int, int, int) volatile { return 42; }
fooMemFun0395 int foo(int, int, int) const volatile { return 42; }
96
fooMemFun0397 int foo(...) { return 42; }
fooMemFun0398 int foo(...) const { return 42; }
fooMemFun0399 int foo(...) volatile { return 42; }
fooMemFun03100 int foo(...) const volatile { return 42; }
101
fooMemFun03102 int foo(int, ...) { return 42; }
fooMemFun03103 int foo(int, ...) const { return 42; }
fooMemFun03104 int foo(int, ...) volatile { return 42; }
fooMemFun03105 int foo(int, ...) const volatile { return 42; }
106
fooMemFun03107 int foo(int, int, ...) { return 42; }
fooMemFun03108 int foo(int, int, ...) const { return 42; }
fooMemFun03109 int foo(int, int, ...) volatile { return 42; }
fooMemFun03110 int foo(int, int, ...) const volatile { return 42; }
111
fooMemFun03112 int foo(int, int, int, ...) { return 42; }
fooMemFun03113 int foo(int, int, int, ...) const { return 42; }
fooMemFun03114 int foo(int, int, int, ...) volatile { return 42; }
fooMemFun03115 int foo(int, int, int, ...) const volatile { return 42; }
116 };
117
118 #if TEST_STD_VER >= 11
119 struct MemFun11 {
fooMemFun11120 int foo() & { return 42; }
fooMemFun11121 int foo() const & { return 42; }
fooMemFun11122 int foo() volatile & { return 42; }
fooMemFun11123 int foo() const volatile & { return 42; }
124
fooMemFun11125 int foo(...) & { return 42; }
fooMemFun11126 int foo(...) const & { return 42; }
fooMemFun11127 int foo(...) volatile & { return 42; }
fooMemFun11128 int foo(...) const volatile & { return 42; }
129
fooMemFun11130 int foo() && { return 42; }
fooMemFun11131 int foo() const && { return 42; }
fooMemFun11132 int foo() volatile && { return 42; }
fooMemFun11133 int foo() const volatile && { return 42; }
134
fooMemFun11135 int foo(...) && { return 42; }
fooMemFun11136 int foo(...) const && { return 42; }
fooMemFun11137 int foo(...) volatile && { return 42; }
fooMemFun11138 int foo(...) const volatile && { return 42; }
139 };
140 #endif // TEST_STD_VER >= 11
141
142 struct MemData {
143 int foo;
144 };
145
146 // Create a non-null free function by taking the address of
147 // &static_cast<Tp&>(foo);
148 template <class Tp>
149 struct Creator {
createCreator150 static Tp create() {
151 return &foo;
152 }
153 };
154
155 // Create a non-null member pointer.
156 template <class Ret, class Class>
157 struct Creator<Ret Class::*> {
158 typedef Ret Class::*ReturnType;
createCreator159 static ReturnType create() {
160 return &Class::foo;
161 }
162 };
163
164 template <class TestFn, class Fn>
test_imp()165 void test_imp() {
166 { // Check that the null value is detected
167 TestFn tf = nullptr;
168 std::function<Fn> f = tf;
169 RTTI_ASSERT(f.template target<TestFn>() == nullptr);
170 }
171 { // Check that the non-null value is detected.
172 TestFn tf = Creator<TestFn>::create();
173 assert(tf != nullptr);
174 std::function<Fn> f = tf;
175 RTTI_ASSERT(f.template target<TestFn>() != nullptr);
176 RTTI_ASSERT(*f.template target<TestFn>() == tf);
177 }
178 }
179
test_func()180 void test_func() {
181 test_imp<int(*)(), int()>();
182 test_imp<int(*)(...), int()>();
183 test_imp<int(*)(int), int(int)>();
184 test_imp<int(*)(int, ...), int(int)>();
185 test_imp<int(*)(int, int), int(int, int)>();
186 test_imp<int(*)(int, int, ...), int(int, int)>();
187 test_imp<int(*)(int, int, int), int(int, int, int)>();
188 test_imp<int(*)(int, int, int, ...), int(int, int, int)>();
189 }
190
test_mf()191 void test_mf() {
192 test_imp<int(MemFun03::*)(), int(MemFun03&)>();
193 test_imp<int(MemFun03::*)(...), int(MemFun03&)>();
194 test_imp<int(MemFun03::*)() const, int(MemFun03&)>();
195 test_imp<int(MemFun03::*)(...) const, int(MemFun03&)>();
196 test_imp<int(MemFun03::*)() volatile, int(MemFun03&)>();
197 test_imp<int(MemFun03::*)(...) volatile, int(MemFun03&)>();
198 test_imp<int(MemFun03::*)() const volatile, int(MemFun03&)>();
199 test_imp<int(MemFun03::*)(...) const volatile, int(MemFun03&)>();
200
201 test_imp<int(MemFun03::*)(int), int(MemFun03&, int)>();
202 test_imp<int(MemFun03::*)(int, ...), int(MemFun03&, int)>();
203 test_imp<int(MemFun03::*)(int) const, int(MemFun03&, int)>();
204 test_imp<int(MemFun03::*)(int, ...) const, int(MemFun03&, int)>();
205 test_imp<int(MemFun03::*)(int) volatile, int(MemFun03&, int)>();
206 test_imp<int(MemFun03::*)(int, ...) volatile, int(MemFun03&, int)>();
207 test_imp<int(MemFun03::*)(int) const volatile, int(MemFun03&, int)>();
208 test_imp<int(MemFun03::*)(int, ...) const volatile, int(MemFun03&, int)>();
209
210 test_imp<int(MemFun03::*)(int, int), int(MemFun03&, int, int)>();
211 test_imp<int(MemFun03::*)(int, int, ...), int(MemFun03&, int, int)>();
212 test_imp<int(MemFun03::*)(int, int) const, int(MemFun03&, int, int)>();
213 test_imp<int(MemFun03::*)(int, int, ...) const, int(MemFun03&, int, int)>();
214 test_imp<int(MemFun03::*)(int, int) volatile, int(MemFun03&, int, int)>();
215 test_imp<int(MemFun03::*)(int, int, ...) volatile, int(MemFun03&, int, int)>();
216 test_imp<int(MemFun03::*)(int, int) const volatile, int(MemFun03&, int, int)>();
217 test_imp<int(MemFun03::*)(int, int, ...) const volatile, int(MemFun03&, int, int)>();
218
219 #if TEST_STD_VER >= 11
220 test_imp<int(MemFun11::*)() &, int(MemFun11&)>();
221 test_imp<int(MemFun11::*)(...) &, int(MemFun11&)>();
222 test_imp<int(MemFun11::*)() const &, int(MemFun11&)>();
223 test_imp<int(MemFun11::*)(...) const &, int(MemFun11&)>();
224 test_imp<int(MemFun11::*)() volatile &, int(MemFun11&)>();
225 test_imp<int(MemFun11::*)(...) volatile &, int(MemFun11&)>();
226 test_imp<int(MemFun11::*)() const volatile &, int(MemFun11&)>();
227 test_imp<int(MemFun11::*)(...) const volatile &, int(MemFun11&)>();
228
229 test_imp<int(MemFun11::*)() &&, int(MemFun11&&)>();
230 test_imp<int(MemFun11::*)(...) &&, int(MemFun11&&)>();
231 test_imp<int(MemFun11::*)() const &&, int(MemFun11&&)>();
232 test_imp<int(MemFun11::*)(...) const &&, int(MemFun11&&)>();
233 test_imp<int(MemFun11::*)() volatile &&, int(MemFun11&&)>();
234 test_imp<int(MemFun11::*)(...) volatile &&, int(MemFun11&&)>();
235 test_imp<int(MemFun11::*)() const volatile &&, int(MemFun11&&)>();
236 test_imp<int(MemFun11::*)(...) const volatile &&, int(MemFun11&&)>();
237 #endif
238 }
239
test_md()240 void test_md() {
241 test_imp<int MemData::*, int(MemData&)>();
242 }
243
main(int,char **)244 int main(int, char**) {
245 test_func();
246 test_mf();
247 test_md();
248
249 return 0;
250 }
251