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 // <sstream>
10 
11 // template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
12 // class basic_stringstream
13 
14 // explicit basic_stringstream(const basic_string<charT,traits,Allocator>& str,
15 //                             ios_base::openmode which = ios_base::out|ios_base::in);
16 
17 #include <sstream>
18 #include <cassert>
19 
20 template<typename T>
21 struct NoDefaultAllocator : std::allocator<T>
22 {
23   template<typename U> struct rebind { using other = NoDefaultAllocator<U>; };
24   NoDefaultAllocator(int id_) : id(id_) { }
25   template<typename U> NoDefaultAllocator(const NoDefaultAllocator<U>& a) : id(a.id) { }
26   int id;
27 };
28 
29 
30 int main(int, char**)
31 {
32     {
33         std::stringstream ss(" 123 456 ");
34         assert(ss.rdbuf() != 0);
35         assert(ss.good());
36         assert(ss.str() == " 123 456 ");
37         int i = 0;
38         ss >> i;
39         assert(i == 123);
40         ss >> i;
41         assert(i == 456);
42         ss << i << ' ' << 123;
43         assert(ss.str() == "456 1236 ");
44     }
45     {
46         std::wstringstream ss(L" 123 456 ");
47         assert(ss.rdbuf() != 0);
48         assert(ss.good());
49         assert(ss.str() == L" 123 456 ");
50         int i = 0;
51         ss >> i;
52         assert(i == 123);
53         ss >> i;
54         assert(i == 456);
55         ss << i << ' ' << 123;
56         assert(ss.str() == L"456 1236 ");
57     }
58     { // This is https://bugs.llvm.org/show_bug.cgi?id=33727
59         typedef std::basic_string   <char, std::char_traits<char>, NoDefaultAllocator<char> > S;
60         typedef std::basic_stringbuf<char, std::char_traits<char>, NoDefaultAllocator<char> > SB;
61 
62         S s(NoDefaultAllocator<char>(1));
63         SB sb(s);
64     //  This test is not required by the standard, but *where else* could it get the allocator?
65         assert(sb.str().get_allocator() == s.get_allocator());
66     }
67 
68   return 0;
69 }
70