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 // <list>
12
13 // template <class... Args> reference emplace_back(Args&&... args);
14 // return type is 'reference' in C++17; 'void' before
15
16 #include <list>
17 #include <cassert>
18
19 #include "test_macros.h"
20 #include "min_allocator.h"
21
22 class A
23 {
24 int i_;
25 double d_;
26
27 A(const A&);
28 A& operator=(const A&);
29 public:
A(int i,double d)30 A(int i, double d)
31 : i_(i), d_(d) {}
32
geti() const33 int geti() const {return i_;}
getd() const34 double getd() const {return d_;}
35 };
36
main(int,char **)37 int main(int, char**)
38 {
39 {
40 std::list<A> c;
41 #if TEST_STD_VER > 14
42 A& r1 = c.emplace_back(2, 3.5);
43 assert(c.size() == 1);
44 assert(&r1 == &c.back());
45 assert(c.front().geti() == 2);
46 assert(c.front().getd() == 3.5);
47 A& r2 = c.emplace_back(3, 4.5);
48 assert(c.size() == 2);
49 assert(&r2 == &c.back());
50 #else
51 c.emplace_back(2, 3.5);
52 assert(c.size() == 1);
53 assert(c.front().geti() == 2);
54 assert(c.front().getd() == 3.5);
55 c.emplace_back(3, 4.5);
56 assert(c.size() == 2);
57 #endif
58 assert(c.front().geti() == 2);
59 assert(c.front().getd() == 3.5);
60 assert(c.back().geti() == 3);
61 assert(c.back().getd() == 4.5);
62 }
63 {
64 std::list<A, min_allocator<A>> c;
65 #if TEST_STD_VER > 14
66 A& r1 = c.emplace_back(2, 3.5);
67 assert(c.size() == 1);
68 assert(&r1 == &c.back());
69 assert(c.front().geti() == 2);
70 assert(c.front().getd() == 3.5);
71 A& r2 = c.emplace_back(3, 4.5);
72 assert(c.size() == 2);
73 assert(&r2 == &c.back());
74 #else
75 c.emplace_back(2, 3.5);
76 assert(c.size() == 1);
77 assert(c.front().geti() == 2);
78 assert(c.front().getd() == 3.5);
79 c.emplace_back(3, 4.5);
80 assert(c.size() == 2);
81 #endif
82 assert(c.front().geti() == 2);
83 assert(c.front().getd() == 3.5);
84 assert(c.back().geti() == 3);
85 assert(c.back().getd() == 4.5);
86 }
87
88 return 0;
89 }
90