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 // <iterator>
10 
11 // template <BackInsertionContainer Cont>
12 //   back_insert_iterator<Cont>
13 //   back_inserter(Cont& x); // constexpr in C++20
14 
15 // template <BackInsertionContainer Cont>
16 //   front_insert_iterator<Cont>
17 //   front_inserter(Cont& x); // constexpr in C++20
18 
19 #include <cassert>
20 #include <iterator>
21 #include <list>
22 
23 #include "test_macros.h"
24 #include "nasty_containers.h"
25 #include "test_constexpr_container.h"
26 
27 template <class C>
28 TEST_CONSTEXPR_CXX20 bool
test(C c)29 test(C c)
30 {
31     std::back_insert_iterator<C> i = std::back_inserter(c);
32     i = 3;
33     assert(c.size() == 1);
34     assert(c.back() == 3);
35     i = 4;
36     assert(c.size() == 2);
37     assert(c.back() == 4);
38     return true;
39 }
40 
main(int,char **)41 int main(int, char**)
42 {
43     test(std::vector<int>());
44     test(nasty_vector<int>());
45 #if TEST_STD_VER >= 20
46     test(ConstexprFixedCapacityDeque<int, 10>());
47     static_assert(test(ConstexprFixedCapacityDeque<int, 10>()));
48 #endif
49     return 0;
50 }
51