| //===----------------------------------------------------------------------===// |
| // |
| // ÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊThe LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <ostream> |
| |
| // template <class charT, class traits = char_traits<charT> > |
| // class basic_ostream; |
| |
| // basic_ostream<charT,traits>& seekp(pos_type pos); |
| |
| #include <ostream> |
| #include <cassert> |
| |
| int seekpos_called = 0; |
| |
| template <class CharT> |
| struct testbuf |
| : public std::basic_streambuf<CharT> |
| { |
| typedef std::basic_streambuf<CharT> base; |
| testbuf() {} |
| |
| protected: |
| |
| typename base::pos_type |
| seekpos(typename base::pos_type sp, std::ios_base::openmode which) |
| { |
| ++seekpos_called; |
| assert(which == std::ios_base::out); |
| return sp; |
| } |
| }; |
| |
| int main() |
| { |
| { |
| std::ostream os((std::streambuf*)0); |
| assert(&os.seekp(5) == &os); |
| assert(seekpos_called == 0); |
| } |
| { |
| testbuf<char> sb; |
| std::ostream os(&sb); |
| assert(&os.seekp(10) == &os); |
| assert(seekpos_called == 1); |
| assert(os.good()); |
| assert(&os.seekp(-1) == &os); |
| assert(seekpos_called == 2); |
| assert(os.fail()); |
| } |
| } |