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 // basic_istream<charT,traits>& get(char_type& c); 13 14 #include <istream> 15 #include <cassert> 16 17 template <class CharT> 18 struct testbuf 19 : public std::basic_streambuf<CharT> 20 { 21 typedef std::basic_string<CharT> string_type; 22 typedef std::basic_streambuf<CharT> base; 23 private: 24 string_type str_; 25 public: 26 27 testbuf() {} 28 testbuf(const string_type& str) 29 : str_(str) 30 { 31 base::setg(const_cast<CharT*>(str_.data()), 32 const_cast<CharT*>(str_.data()), 33 const_cast<CharT*>(str_.data()) + str_.size()); 34 } 35 36 CharT* eback() const {return base::eback();} 37 CharT* gptr() const {return base::gptr();} 38 CharT* egptr() const {return base::egptr();} 39 }; 40 41 int main() 42 { 43 { 44 testbuf<char> sb(" "); 45 std::istream is(&sb); 46 char c; 47 is.get(c); 48 assert(!is.eof()); 49 assert(!is.fail()); 50 assert(c == ' '); 51 assert(is.gcount() == 1); 52 } 53 { 54 testbuf<char> sb(" abc"); 55 std::istream is(&sb); 56 char c; 57 is.get(c); 58 assert(!is.eof()); 59 assert(!is.fail()); 60 assert(c == ' '); 61 assert(is.gcount() == 1); 62 is.get(c); 63 assert(!is.eof()); 64 assert(!is.fail()); 65 assert(c == 'a'); 66 assert(is.gcount() == 1); 67 is.get(c); 68 assert(!is.eof()); 69 assert(!is.fail()); 70 assert(c == 'b'); 71 assert(is.gcount() == 1); 72 is.get(c); 73 assert(!is.eof()); 74 assert(!is.fail()); 75 assert(c == 'c'); 76 assert(is.gcount() == 1); 77 } 78 { 79 testbuf<wchar_t> sb(L" abc"); 80 std::wistream is(&sb); 81 wchar_t c; 82 is.get(c); 83 assert(!is.eof()); 84 assert(!is.fail()); 85 assert(c == L' '); 86 assert(is.gcount() == 1); 87 is.get(c); 88 assert(!is.eof()); 89 assert(!is.fail()); 90 assert(c == L'a'); 91 assert(is.gcount() == 1); 92 is.get(c); 93 assert(!is.eof()); 94 assert(!is.fail()); 95 assert(c == L'b'); 96 assert(is.gcount() == 1); 97 is.get(c); 98 assert(!is.eof()); 99 assert(!is.fail()); 100 assert(c == L'c'); 101 assert(is.gcount() == 1); 102 } 103 } 104