111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert//===----------------------------------------------------------------------===// 211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// 311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// The LLVM Compiler Infrastructure 411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// 511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// This file is dual licensed under the MIT and the University of Illinois Open 611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// Source Licenses. See LICENSE.TXT for details. 711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// 811cd02dfb91661c65134cac258cf5924270e9d2Dan Albert//===----------------------------------------------------------------------===// 911cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 1011cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// <istream> 1111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 1211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert// basic_istream<charT,traits>& seekg(pos_type pos); 1311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 1411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert#include <istream> 1511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert#include <cassert> 1611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 1711cd02dfb91661c65134cac258cf5924270e9d2Dan Alberttemplate <class CharT> 1811cd02dfb91661c65134cac258cf5924270e9d2Dan Albertstruct testbuf 1911cd02dfb91661c65134cac258cf5924270e9d2Dan Albert : public std::basic_streambuf<CharT> 2011cd02dfb91661c65134cac258cf5924270e9d2Dan Albert{ 2111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert typedef std::basic_string<CharT> string_type; 2211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert typedef std::basic_streambuf<CharT> base; 2311cd02dfb91661c65134cac258cf5924270e9d2Dan Albertprivate: 2411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert string_type str_; 2511cd02dfb91661c65134cac258cf5924270e9d2Dan Albertpublic: 2611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 2711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert testbuf() {} 2811cd02dfb91661c65134cac258cf5924270e9d2Dan Albert testbuf(const string_type& str) 2911cd02dfb91661c65134cac258cf5924270e9d2Dan Albert : str_(str) 3011cd02dfb91661c65134cac258cf5924270e9d2Dan Albert { 3111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert base::setg(const_cast<CharT*>(str_.data()), 3211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert const_cast<CharT*>(str_.data()), 3311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert const_cast<CharT*>(str_.data()) + str_.size()); 3411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert } 3511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 3611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert CharT* eback() const {return base::eback();} 3711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert CharT* gptr() const {return base::gptr();} 3811cd02dfb91661c65134cac258cf5924270e9d2Dan Albert CharT* egptr() const {return base::egptr();} 3911cd02dfb91661c65134cac258cf5924270e9d2Dan Albertprotected: 4011cd02dfb91661c65134cac258cf5924270e9d2Dan Albert typename base::pos_type seekpos(typename base::pos_type sp, 4111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert std::ios_base::openmode which) 4211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert { 4311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert assert(which == std::ios_base::in); 4411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert return sp; 4511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert } 4611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert}; 4711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert 4811cd02dfb91661c65134cac258cf5924270e9d2Dan Albertint main() 4911cd02dfb91661c65134cac258cf5924270e9d2Dan Albert{ 5011cd02dfb91661c65134cac258cf5924270e9d2Dan Albert { 5111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert testbuf<char> sb(" 123456789"); 5211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert std::istream is(&sb); 5311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert is.seekg(5); 5411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert assert(is.good()); 5511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert is.seekg(-1); 5611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert assert(is.fail()); 5711cd02dfb91661c65134cac258cf5924270e9d2Dan Albert } 5811cd02dfb91661c65134cac258cf5924270e9d2Dan Albert { 5911cd02dfb91661c65134cac258cf5924270e9d2Dan Albert testbuf<wchar_t> sb(L" 123456789"); 6011cd02dfb91661c65134cac258cf5924270e9d2Dan Albert std::wistream is(&sb); 6111cd02dfb91661c65134cac258cf5924270e9d2Dan Albert is.seekg(5); 6211cd02dfb91661c65134cac258cf5924270e9d2Dan Albert assert(is.good()); 6311cd02dfb91661c65134cac258cf5924270e9d2Dan Albert is.seekg(-1); 6411cd02dfb91661c65134cac258cf5924270e9d2Dan Albert assert(is.fail()); 6511cd02dfb91661c65134cac258cf5924270e9d2Dan Albert } 6611cd02dfb91661c65134cac258cf5924270e9d2Dan Albert} 67