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& operator=(nullptr_t);
16
17#include <functional>
18#include <cassert>
19
20#include "count_new.h"
21
22#include "test_macros.h"
23
24class A
25{
26 int data_[10];
27public:
28 static int count;
29
30 A()
31 {
32 ++count;
33 for (int i = 0; i < 10; ++i)
34 data_[i] = i;
35 }
36
37 A(const A&) {++count;}
38
39 ~A() {--count;}
40
41 int operator()(int i) const
42 {
43 for (int j = 0; j < 10; ++j)
44 i += data_[j];
45 return i;
46 }
47};
48
49int A::count = 0;
50
51int g(int) {return 0;}
52
53int main(int, char**)
54{
55 globalMemCounter.reset();
56 assert(globalMemCounter.checkOutstandingNewEq(0));
57 {
58 std::function<int(int)> f = A();
59 assert(A::count == 1);
60 assert(globalMemCounter.checkOutstandingNewLessThanOrEqual(1));
61 RTTI_ASSERT(f.target<A>());
62 f = nullptr;
63 assert(A::count == 0);
64 assert(globalMemCounter.checkOutstandingNewEq(0));
65 RTTI_ASSERT(f.target<A>() == 0);
66 }
67 {
68 std::function<int(int)> f = g;
69 assert(globalMemCounter.checkOutstandingNewEq(0));
70 RTTI_ASSERT(f.target<int(*)(int)>());
71 RTTI_ASSERT(f.target<A>() == 0);
72 f = nullptr;
73 assert(globalMemCounter.checkOutstandingNewEq(0));
74 RTTI_ASSERT(f.target<int(*)(int)>() == 0);
75 }
76
77 return 0;
78}
79

source code of libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/nullptr_t_assign.pass.cpp