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 // template <class charT, class traits, class T> 13 // basic_istream<charT, traits>& 14 // operator>>(basic_istream<charT, traits>&& is, T& x); 15 16 #include <istream> 17 #include <cassert> 18 19 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 20 21 template <class CharT> 22 struct testbuf 23 : public std::basic_streambuf<CharT> 24 { 25 typedef std::basic_string<CharT> string_type; 26 typedef std::basic_streambuf<CharT> base; 27 private: 28 string_type str_; 29 public: 30 31 testbuf() {} 32 testbuf(const string_type& str) 33 : str_(str) 34 { 35 base::setg(const_cast<CharT*>(str_.data()), 36 const_cast<CharT*>(str_.data()), 37 const_cast<CharT*>(str_.data()) + str_.size()); 38 } 39 40 CharT* eback() const {return base::eback();} 41 CharT* gptr() const {return base::gptr();} 42 CharT* egptr() const {return base::egptr();} 43 }; 44 45 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 46 47 int main() 48 { 49 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 50 { 51 testbuf<char> sb(" 123"); 52 int i = 0; 53 std::istream(&sb) >> i; 54 assert(i == 123); 55 } 56 { 57 testbuf<wchar_t> sb(L" 123"); 58 int i = 0; 59 std::wistream(&sb) >> i; 60 assert(i == 123); 61 } 62 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 63 } 64
