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(basic_streambuf<char_type,traits>& sb, 13 // char_type delim); 14 15 #include <istream> 16 #include <cassert> 17 18 template <class CharT> 19 class testbuf 20 : public std::basic_streambuf<CharT> 21 { 22 typedef std::basic_streambuf<CharT> base; 23 std::basic_string<CharT> str_; 24 public: 25 testbuf() 26 { 27 } 28 testbuf(const std::basic_string<CharT>& 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 std::basic_string<CharT> str() const 37 {return std::basic_string<CharT>(base::pbase(), base::pptr());} 38 39 protected: 40 41 virtual typename base::int_type 42 overflow(typename base::int_type __c = base::traits_type::eof()) 43 { 44 if (__c != base::traits_type::eof()) 45 { 46 int n = str_.size(); 47 str_.push_back(__c); 48 str_.resize(str_.capacity()); 49 base::setp(const_cast<CharT*>(str_.data()), 50 const_cast<CharT*>(str_.data() + str_.size())); 51 base::pbump(n+1); 52 } 53 return __c; 54 } 55 }; 56 57 int main() 58 { 59 { 60 testbuf<char> sb("testing*..."); 61 std::istream is(&sb); 62 testbuf<char> sb2; 63 is.get(sb2, '*'); 64 assert(sb2.str() == "testing"); 65 assert(is.good()); 66 assert(is.gcount() == 7); 67 assert(is.get() == '*'); 68 is.get(sb2, '*'); 69 assert(sb2.str() == "testing..."); 70 assert(is.eof()); 71 assert(!is.fail()); 72 assert(is.gcount() == 3); 73 } 74 { 75 testbuf<wchar_t> sb(L"testing*..."); 76 std::wistream is(&sb); 77 testbuf<wchar_t> sb2; 78 is.get(sb2, L'*'); 79 assert(sb2.str() == L"testing"); 80 assert(is.good()); 81 assert(is.gcount() == 7); 82 assert(is.get() == L'*'); 83 is.get(sb2, L'*'); 84 assert(sb2.str() == L"testing..."); 85 assert(is.eof()); 86 assert(!is.fail()); 87 assert(is.gcount() == 3); 88 } 89 } 90
