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 // <sstream>
12
13 // template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
14 // class basic_stringbuf
15
16 // basic_stringbuf& operator=(basic_stringbuf&& rhs);
17
18 #include <sstream>
19 #include <cassert>
20 #include <utility>
21
22 #include "make_string.h"
23 #include "test_macros.h"
24
25 #define STR(S) MAKE_STRING(CharT, S)
26
27 template <class CharT>
28 struct test_stringbuf : std::basic_stringbuf<CharT> {
29 using std::basic_stringbuf<CharT>::basic_stringbuf;
30
31 // Checks the following requirement after being moved from:
32 // The six pointers of std::basic_streambuf in *this are guaranteed to be different
33 // from the corresponding pointers in the moved-from rhs unless null.
check_different_pointerstest_stringbuf34 void check_different_pointers(test_stringbuf<CharT> const& other) const {
35 assert(this->eback() == nullptr || this->eback() != other.eback());
36 assert(this->gptr() == nullptr || this->gptr() != other.gptr());
37 assert(this->egptr() == nullptr || this->egptr() != other.egptr());
38 assert(this->pbase() == nullptr || this->pbase() != other.pbase());
39 assert(this->pptr() == nullptr || this->pptr() != other.pptr());
40 assert(this->epptr() == nullptr || this->epptr() != other.epptr());
41 }
42 };
43
44 template <class CharT>
test()45 void test() {
46 std::basic_string<CharT> strings[] = {STR(""), STR("short"), STR("loooooooooooooooooooong")};
47 for (std::basic_string<CharT> const& s : strings) {
48 {
49 test_stringbuf<CharT> buf1(s);
50 test_stringbuf<CharT> buf;
51 buf = std::move(buf1);
52 assert(buf.str() == s);
53 buf.check_different_pointers(buf1);
54 }
55 {
56 test_stringbuf<CharT> buf1(s, std::ios_base::in);
57 test_stringbuf<CharT> buf;
58 buf = std::move(buf1);
59 assert(buf.str() == s);
60 buf.check_different_pointers(buf1);
61 }
62 {
63 test_stringbuf<CharT> buf1(s, std::ios_base::out);
64 test_stringbuf<CharT> buf;
65 buf = std::move(buf1);
66 assert(buf.str() == s);
67 buf.check_different_pointers(buf1);
68 }
69 {
70 test_stringbuf<CharT> buf1;
71 test_stringbuf<CharT> buf;
72 buf = std::move(buf1);
73 buf.check_different_pointers(buf1);
74 }
75 // Use the assignment operator on an actual std::stringbuf, not test_stringbuf
76 {
77 std::basic_stringbuf<CharT> buf1(s);
78 std::basic_stringbuf<CharT> buf;
79 buf = std::move(buf1);
80 assert(buf.str() == s);
81 }
82 }
83 }
84
main(int,char **)85 int main(int, char**) {
86 test<char>();
87 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
88 test<wchar_t>();
89 #endif
90 return 0;
91 }
92