1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // <sstream> 11 12 // template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> > 13 // class basic_stringbuf 14 15 // int_type pbackfail(int_type c = traits::eof()); 16 17 #include <sstream> 18 #include <cassert> 19 20 template <class CharT> 21 struct testbuf 22 : public std::basic_stringbuf<CharT> 23 { 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) 27 : base(str, which) {} 28 29 typename base::int_type 30 pbackfail(typename base::int_type c = base::traits_type::eof()) 31 {return base::pbackfail(c);} 32 33 void pbump(int n) {base::pbump(n);} 34 }; 35 36 int main() 37 { 38 { // sanity check 39 testbuf<char> tb(""); 40 tb.pbackfail(); 41 } 42 { 43 testbuf<char> sb("123", std::ios_base::in); 44 assert(sb.sgetc() == '1'); 45 assert(sb.snextc() == '2'); 46 assert(sb.snextc() == '3'); 47 assert(sb.sgetc() == '3'); 48 assert(sb.snextc() == std::char_traits<char>::eof()); 49 assert(sb.pbackfail('3') == '3'); 50 assert(sb.pbackfail('3') == std::char_traits<char>::eof()); 51 assert(sb.pbackfail('2') == '2'); 52 assert(sb.pbackfail(std::char_traits<char>::eof()) != std::char_traits<char>::eof()); 53 assert(sb.pbackfail(std::char_traits<char>::eof()) == std::char_traits<char>::eof()); 54 assert(sb.str() == "123"); 55 } 56 { 57 testbuf<char> sb("123"); 58 assert(sb.sgetc() == '1'); 59 assert(sb.snextc() == '2'); 60 assert(sb.snextc() == '3'); 61 assert(sb.sgetc() == '3'); 62 assert(sb.snextc() == std::char_traits<char>::eof()); 63 assert(sb.pbackfail('3') == '3'); 64 assert(sb.pbackfail('3') == '3'); 65 assert(sb.pbackfail(std::char_traits<char>::eof()) != std::char_traits<char>::eof()); 66 assert(sb.pbackfail(std::char_traits<char>::eof()) == std::char_traits<char>::eof()); 67 assert(sb.str() == "133"); 68 } 69 { 70 testbuf<wchar_t> sb(L"123", std::ios_base::in); 71 assert(sb.sgetc() == L'1'); 72 assert(sb.snextc() == L'2'); 73 assert(sb.snextc() == L'3'); 74 assert(sb.sgetc() == L'3'); 75 assert(sb.snextc() == std::char_traits<wchar_t>::eof()); 76 assert(sb.pbackfail(L'3') == L'3'); 77 assert(sb.pbackfail(L'3') == std::char_traits<wchar_t>::eof()); 78 assert(sb.pbackfail(L'2') == L'2'); 79 assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) != std::char_traits<wchar_t>::eof()); 80 assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) == std::char_traits<wchar_t>::eof()); 81 assert(sb.str() == L"123"); 82 } 83 { 84 testbuf<wchar_t> sb(L"123"); 85 assert(sb.sgetc() == L'1'); 86 assert(sb.snextc() == L'2'); 87 assert(sb.snextc() == L'3'); 88 assert(sb.sgetc() == L'3'); 89 assert(sb.snextc() == std::char_traits<wchar_t>::eof()); 90 assert(sb.pbackfail(L'3') == L'3'); 91 assert(sb.pbackfail(L'3') == L'3'); 92 assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) != std::char_traits<wchar_t>::eof()); 93 assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) == std::char_traits<wchar_t>::eof()); 94 assert(sb.str() == L"133"); 95 } 96 } 97
