1 //===----------------------------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
12 // template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
13 // class basic_stringbuf
15 // int_type pbackfail(int_type c = traits::eof());
20 template <class CharT>
22 : public std::basic_stringbuf<CharT>
24 typedef std::basic_stringbuf<CharT> base;
25 explicit testbuf(const std::basic_string<CharT>& str,
26 std::ios_base::openmode which = std::ios_base::in | std::ios_base::out)
29 typename base::int_type
30 pbackfail(typename base::int_type c = base::type_traits::eof())
31 {return base::pbackfail(c);}
33 void pbump(int n) {base::pbump(n);}
39 testbuf<char> sb("123", std::ios_base::in);
40 assert(sb.sgetc() == '1');
41 assert(sb.snextc() == '2');
42 assert(sb.snextc() == '3');
43 assert(sb.sgetc() == '3');
44 assert(sb.snextc() == std::char_traits<char>::eof());
45 assert(sb.pbackfail('3') == '3');
46 assert(sb.pbackfail('3') == std::char_traits<char>::eof());
47 assert(sb.pbackfail('2') == '2');
48 assert(sb.pbackfail(std::char_traits<char>::eof()) != std::char_traits<char>::eof());
49 assert(sb.pbackfail(std::char_traits<char>::eof()) == std::char_traits<char>::eof());
50 assert(sb.str() == "123");
53 testbuf<char> sb("123");
54 assert(sb.sgetc() == '1');
55 assert(sb.snextc() == '2');
56 assert(sb.snextc() == '3');
57 assert(sb.sgetc() == '3');
58 assert(sb.snextc() == std::char_traits<char>::eof());
59 assert(sb.pbackfail('3') == '3');
60 assert(sb.pbackfail('3') == '3');
61 assert(sb.pbackfail(std::char_traits<char>::eof()) != std::char_traits<char>::eof());
62 assert(sb.pbackfail(std::char_traits<char>::eof()) == std::char_traits<char>::eof());
63 assert(sb.str() == "133");
66 testbuf<wchar_t> sb(L"123", std::ios_base::in);
67 assert(sb.sgetc() == L'1');
68 assert(sb.snextc() == L'2');
69 assert(sb.snextc() == L'3');
70 assert(sb.sgetc() == L'3');
71 assert(sb.snextc() == std::char_traits<wchar_t>::eof());
72 assert(sb.pbackfail(L'3') == L'3');
73 assert(sb.pbackfail(L'3') == std::char_traits<wchar_t>::eof());
74 assert(sb.pbackfail(L'2') == L'2');
75 assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) != std::char_traits<wchar_t>::eof());
76 assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) == std::char_traits<wchar_t>::eof());
77 assert(sb.str() == L"123");
80 testbuf<wchar_t> sb(L"123");
81 assert(sb.sgetc() == L'1');
82 assert(sb.snextc() == L'2');
83 assert(sb.snextc() == L'3');
84 assert(sb.sgetc() == L'3');
85 assert(sb.snextc() == std::char_traits<wchar_t>::eof());
86 assert(sb.pbackfail(L'3') == L'3');
87 assert(sb.pbackfail(L'3') == L'3');
88 assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) != std::char_traits<wchar_t>::eof());
89 assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) == std::char_traits<wchar_t>::eof());
90 assert(sb.str() == L"133");