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 // <istream> 11 12 // basic_istream<charT,traits>& 13 // ignore(streamsize n = 1, int_type delim = traits::eof()); 14 15 #include <istream> 16 #include <cassert> 17 18 template <class CharT> 19 struct testbuf 20 : public std::basic_streambuf<CharT> 21 { 22 typedef std::basic_string<CharT> string_type; 23 typedef std::basic_streambuf<CharT> base; 24 private: 25 string_type str_; 26 public: 27 28 testbuf() {} 29 testbuf(const string_type& str) 30 : str_(str) 31 { 32 base::setg(const_cast<CharT*>(str_.data()), 33 const_cast<CharT*>(str_.data()), 34 const_cast<CharT*>(str_.data()) + str_.size()); 35 } 36 37 CharT* eback() const {return base::eback();} 38 CharT* gptr() const {return base::gptr();} 39 CharT* egptr() const {return base::egptr();} 40 }; 41 42 int main() 43 { 44 { 45 testbuf<char> sb(" 1\n2345\n6"); 46 std::istream is(&sb); 47 is.ignore(); 48 assert(!is.eof()); 49 assert(!is.fail()); 50 assert(is.gcount() == 1); 51 is.ignore(5, '\n'); 52 assert(!is.eof()); 53 assert(!is.fail()); 54 assert(is.gcount() == 2); 55 is.ignore(15); 56 assert( is.eof()); 57 assert(!is.fail()); 58 assert(is.gcount() == 6); 59 } 60 { 61 testbuf<wchar_t> sb(L" 1\n2345\n6"); 62 std::wistream is(&sb); 63 is.ignore(); 64 assert(!is.eof()); 65 assert(!is.fail()); 66 assert(is.gcount() == 1); 67 is.ignore(5, '\n'); 68 assert(!is.eof()); 69 assert(!is.fail()); 70 assert(is.gcount() == 2); 71 is.ignore(15); 72 assert( is.eof()); 73 assert(!is.fail()); 74 assert(is.gcount() == 6); 75 } 76 } 77
