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 // <ostream> 11 12 // template <class charT, class traits = char_traits<charT> > 13 // class basic_ostream; 14 15 // pos_type tellp(); 16 17 #include <ostream> 18 #include <cassert> 19 20 int seekoff_called = 0; 21 22 template <class CharT> 23 struct testbuf 24 : public std::basic_streambuf<CharT> 25 { 26 typedef std::basic_streambuf<CharT> base; 27 testbuf() {} 28 29 protected: 30 31 typename base::pos_type 32 seekoff(typename base::off_type off, std::ios_base::seekdir way, std::ios_base::openmode which) 33 { 34 assert(off == 0); 35 assert(way == std::ios_base::cur); 36 assert(which == std::ios_base::out); 37 ++seekoff_called; 38 return 10; 39 } 40 }; 41 42 int main() 43 { 44 { 45 std::ostream os((std::streambuf*)0); 46 assert(os.tellp() == -1); 47 } 48 { 49 testbuf<char> sb; 50 std::ostream os(&sb); 51 assert(os.tellp() == 10); 52 assert(seekoff_called == 1); 53 } 54 } 55
