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 // int_type get(); 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 = is.get(); 47 assert(!is.eof()); 48 assert(!is.fail()); 49 assert(c == ' '); 50 assert(is.gcount() == 1); 51 } 52 { 53 testbuf<char> sb(" abc"); 54 std::istream is(&sb); 55 char c = is.get(); 56 assert(!is.eof()); 57 assert(!is.fail()); 58 assert(c == ' '); 59 assert(is.gcount() == 1); 60 c = is.get(); 61 assert(!is.eof()); 62 assert(!is.fail()); 63 assert(c == 'a'); 64 assert(is.gcount() == 1); 65 c = is.get(); 66 assert(!is.eof()); 67 assert(!is.fail()); 68 assert(c == 'b'); 69 assert(is.gcount() == 1); 70 c = is.get(); 71 assert(!is.eof()); 72 assert(!is.fail()); 73 assert(c == 'c'); 74 assert(is.gcount() == 1); 75 } 76 { 77 testbuf<wchar_t> sb(L" abc"); 78 std::wistream is(&sb); 79 wchar_t c = is.get(); 80 assert(!is.eof()); 81 assert(!is.fail()); 82 assert(c == L' '); 83 assert(is.gcount() == 1); 84 c = is.get(); 85 assert(!is.eof()); 86 assert(!is.fail()); 87 assert(c == L'a'); 88 assert(is.gcount() == 1); 89 c = is.get(); 90 assert(!is.eof()); 91 assert(!is.fail()); 92 assert(c == L'b'); 93 assert(is.gcount() == 1); 94 c = is.get(); 95 assert(!is.eof()); 96 assert(!is.fail()); 97 assert(c == L'c'); 98 assert(is.gcount() == 1); 99 } 100 } 101
