1bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant//===----------------------------------------------------------------------===// 2bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// 3f5256e16dfc425c1d466f6308d4026d529ce9e0bHoward Hinnant// The LLVM Compiler Infrastructure 4bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// 5b64f8b07c104c6cc986570ac8ee0ed16a9f23976Howard Hinnant// This file is dual licensed under the MIT and the University of Illinois Open 6b64f8b07c104c6cc986570ac8ee0ed16a9f23976Howard Hinnant// Source Licenses. See LICENSE.TXT for details. 7bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// 8bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant//===----------------------------------------------------------------------===// 9bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 10bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// <istream> 11bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 12256813f4e7915d64776a4edd5f4765d893b9f062Howard Hinnant// template<class charT, class traits> 13bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// basic_istream<charT,traits>& operator>>(basic_istream<charT,traits>&& in, charT& c); 14bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 15bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant#include <istream> 16bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant#include <cassert> 17bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 18bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnanttemplate <class CharT> 19bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnantstruct testbuf 20bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant : public std::basic_streambuf<CharT> 21bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant{ 22bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant typedef std::basic_string<CharT> string_type; 23bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant typedef std::basic_streambuf<CharT> base; 24bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnantprivate: 25bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant string_type str_; 26bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnantpublic: 27bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 28bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant testbuf() {} 29bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant testbuf(const string_type& str) 30bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant : str_(str) 31bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant { 32bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant base::setg(const_cast<CharT*>(str_.data()), 33bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant const_cast<CharT*>(str_.data()), 34bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant const_cast<CharT*>(str_.data()) + str_.size()); 35bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant } 36bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 37bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant CharT* eback() const {return base::eback();} 38bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant CharT* gptr() const {return base::gptr();} 39bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant CharT* egptr() const {return base::egptr();} 40bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant}; 41bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 42bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnantint main() 43bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant{ 44bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant { 45bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant testbuf<char> sb(" "); 46bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant std::istream is(&sb); 47bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant char c = 'z'; 48bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant is >> c; 49bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert( is.eof()); 50bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert( is.fail()); 51bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(c == 'z'); 52bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant } 53bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant { 54bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant testbuf<char> sb(" abcdefghijk "); 55bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant std::istream is(&sb); 56bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant char c; 57bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant is >> c; 58bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(!is.eof()); 59bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(!is.fail()); 60bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(c == 'a'); 61bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant is >> c; 62bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(!is.eof()); 63bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(!is.fail()); 64bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(c == 'b'); 65bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant is >> c; 66bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(!is.eof()); 67bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(!is.fail()); 68bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(c == 'c'); 69bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant } 70bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant { 71bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant testbuf<wchar_t> sb(L" abc"); 72bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant std::wistream is(&sb); 73bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant wchar_t c; 74bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant is >> c; 75bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(!is.eof()); 76bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(!is.fail()); 77bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(c == L'a'); 78bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant is >> c; 79bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(!is.eof()); 80bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(!is.fail()); 81bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(c == L'b'); 82bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant is >> c; 83d515df2a50342d2324563f175d90d80284da00d4Howard Hinnant assert(!is.eof()); 84bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(!is.fail()); 85bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(c == L'c'); 86bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant } 87bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant} 88