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 // REQUIRES: c++03 || c++11 || c++14
11 
12 // class function<R(ArgTypes...)>
13 
14 // template<class F, class A> function(allocator_arg_t, const A&, F);
15 
16 // This test runs in C++03, but we have deprecated using std::function in C++03.
17 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
18 
19 #include <functional>
20 #include <cassert>
21 
22 #include "test_macros.h"
23 #include "min_allocator.h"
24 #include "test_allocator.h"
25 #include "count_new.h"
26 #include "../function_types.h"
27 
28 #if TEST_STD_VER >= 11
29 struct RValueCallable {
30     template <class ...Args>
31     void operator()(Args&&...) && {}
32 };
33 struct LValueCallable {
34     template <class ...Args>
35     void operator()(Args&&...) & {}
36 };
37 #endif
38 
39 test_allocator_statistics alloc_stats;
40 
41 class DummyClass {};
42 
43 template <class FuncType, class AllocType>
44 void test_FunctionObject(AllocType& alloc)
45 {
46     assert(globalMemCounter.checkOutstandingNewEq(0));
47     {
48     FunctionObject target;
49     assert(FunctionObject::count == 1);
50     assert(globalMemCounter.checkOutstandingNewEq(0));
51     std::function<FuncType> f2(std::allocator_arg, alloc, target);
52     assert(FunctionObject::count == 2);
53     assert(globalMemCounter.checkOutstandingNewEq(1));
54     assert(f2.template target<FunctionObject>());
55     assert(f2.template target<FuncType>() == 0);
56     assert(f2.template target<FuncType*>() == 0);
57     }
58     assert(FunctionObject::count == 0);
59     assert(globalMemCounter.checkOutstandingNewEq(0));
60 }
61 
62 
63 template <class FuncType, class AllocType>
64 void test_FreeFunction(AllocType& alloc)
65 {
66     assert(globalMemCounter.checkOutstandingNewEq(0));
67     {
68     FuncType* target = &FreeFunction;
69     assert(globalMemCounter.checkOutstandingNewEq(0));
70     std::function<FuncType> f2(std::allocator_arg, alloc, target);
71     // The allocator may not fit in the small object buffer, if we allocated
72     // check it was done via the allocator.
73     assert(globalMemCounter.checkOutstandingNewEq(alloc_stats.alloc_count));
74     assert(f2.template target<FuncType*>());
75     assert(*f2.template target<FuncType*>() == target);
76     assert(f2.template target<FuncType>() == 0);
77     assert(f2.template target<DummyClass>() == 0);
78     }
79     assert(globalMemCounter.checkOutstandingNewEq(0));
80 }
81 
82 template <class TargetType, class FuncType, class AllocType>
83 void test_MemFunClass(AllocType& alloc)
84 {
85     assert(globalMemCounter.checkOutstandingNewEq(0));
86     {
87     TargetType target = &MemFunClass::foo;
88     assert(globalMemCounter.checkOutstandingNewEq(0));
89     std::function<FuncType> f2(std::allocator_arg, alloc, target);
90     assert(globalMemCounter.checkOutstandingNewEq(alloc_stats.alloc_count));
91     assert(f2.template target<TargetType>());
92     assert(*f2.template target<TargetType>() == target);
93     assert(f2.template target<FuncType*>() == 0);
94     }
95     assert(globalMemCounter.checkOutstandingNewEq(0));
96 }
97 
98 template <class Alloc>
99 void test_for_alloc(Alloc& alloc) {
100     test_FunctionObject<int()>(alloc);
101     test_FunctionObject<int(int)>(alloc);
102     test_FunctionObject<int(int, int)>(alloc);
103     test_FunctionObject<int(int, int, int)>(alloc);
104 
105     test_FreeFunction<int()>(alloc);
106     test_FreeFunction<int(int)>(alloc);
107     test_FreeFunction<int(int, int)>(alloc);
108     test_FreeFunction<int(int, int, int)>(alloc);
109 
110     test_MemFunClass<int(MemFunClass::*)() const, int(MemFunClass&)>(alloc);
111     test_MemFunClass<int(MemFunClass::*)(int) const, int(MemFunClass&, int)>(alloc);
112     test_MemFunClass<int(MemFunClass::*)(int, int) const, int(MemFunClass&, int, int)>(alloc);
113 }
114 
115 int main(int, char**) {
116   globalMemCounter.reset();
117   {
118     bare_allocator<DummyClass> bare_alloc;
119     test_for_alloc(bare_alloc);
120   }
121     {
122         non_default_test_allocator<DummyClass> non_default_alloc(42, &alloc_stats);
123         test_for_alloc(non_default_alloc);
124     }
125 #if TEST_STD_VER >= 11
126     {
127         using Fn = std::function<void(int, int, int)>;
128         static_assert(std::is_constructible<Fn, std::allocator_arg_t, std::allocator<int>, LValueCallable&>::value, "");
129         static_assert(std::is_constructible<Fn, std::allocator_arg_t, std::allocator<int>, LValueCallable>::value, "");
130         static_assert(!std::is_constructible<Fn, std::allocator_arg_t, std::allocator<int>, RValueCallable&>::value, "");
131         static_assert(!std::is_constructible<Fn, std::allocator_arg_t, std::allocator<int>, RValueCallable>::value, "");
132     }
133 #endif
134 
135 
136   return 0;
137 }
138