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 // <strstream> 11 12 // class strstreambuf 13 14 // int_type pbackfail(int_type c = EOF); 15 16 #include <strstream> 17 #include <cassert> 18 19 struct test 20 : public std::strstreambuf 21 { 22 typedef std::strstreambuf base; 23 test(char* gnext_arg, std::streamsize n, char* pbeg_arg = 0) 24 : base(gnext_arg, n, pbeg_arg) {} 25 test(const char* gnext_arg, std::streamsize n) 26 : base(gnext_arg, n) {} 27 28 virtual int_type pbackfail(int_type c = EOF) {return base::pbackfail(c);} 29 }; 30 31 int main() 32 { 33 { 34 const char buf[] = "123"; 35 test sb(buf, 0); 36 assert(sb.sgetc() == '1'); 37 assert(sb.snextc() == '2'); 38 assert(sb.snextc() == '3'); 39 assert(sb.sgetc() == '3'); 40 assert(sb.snextc() == EOF); 41 assert(sb.pbackfail('3') == '3'); 42 assert(sb.pbackfail('3') == EOF); 43 assert(sb.pbackfail('2') == '2'); 44 assert(sb.pbackfail(EOF) != EOF); 45 assert(sb.pbackfail(EOF) == EOF); 46 assert(sb.str() == std::string("123")); 47 } 48 { 49 char buf[] = "123"; 50 test sb(buf, 0); 51 assert(sb.sgetc() == '1'); 52 assert(sb.snextc() == '2'); 53 assert(sb.snextc() == '3'); 54 assert(sb.sgetc() == '3'); 55 assert(sb.snextc() == EOF); 56 assert(sb.pbackfail('3') == '3'); 57 assert(sb.pbackfail('3') == '3'); 58 assert(sb.pbackfail(EOF) != EOF); 59 assert(sb.pbackfail(EOF) == EOF); 60 assert(sb.str() == std::string("133")); 61 } 62 } 63
