Dan Albert | 287553d | 2017-02-16 10:47:51 -0800 | [diff] [blame] | 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 | // <ostream> |
| 11 | |
| 12 | // template <class charT, class traits = char_traits<charT> > |
| 13 | // class basic_ostream; |
| 14 | |
| 15 | // operator<<(unsigned short val); |
| 16 | |
| 17 | #include <ostream> |
| 18 | #include <cassert> |
| 19 | |
| 20 | template <class CharT> |
| 21 | class testbuf |
| 22 | : public std::basic_streambuf<CharT> |
| 23 | { |
| 24 | typedef std::basic_streambuf<CharT> base; |
| 25 | std::basic_string<CharT> str_; |
| 26 | public: |
| 27 | testbuf() |
| 28 | { |
| 29 | } |
| 30 | |
| 31 | std::basic_string<CharT> str() const |
| 32 | {return std::basic_string<CharT>(base::pbase(), base::pptr());} |
| 33 | |
| 34 | protected: |
| 35 | |
| 36 | virtual typename base::int_type |
| 37 | overflow(typename base::int_type __c = base::traits_type::eof()) |
| 38 | { |
| 39 | if (__c != base::traits_type::eof()) |
| 40 | { |
| 41 | int n = str_.size(); |
| 42 | str_.push_back(__c); |
| 43 | str_.resize(str_.capacity()); |
| 44 | base::setp(const_cast<CharT*>(str_.data()), |
| 45 | const_cast<CharT*>(str_.data() + str_.size())); |
| 46 | base::pbump(n+1); |
| 47 | } |
| 48 | return __c; |
| 49 | } |
| 50 | }; |
| 51 | |
| 52 | int main() |
| 53 | { |
| 54 | { |
| 55 | std::ostream os((std::streambuf*)0); |
| 56 | unsigned short n = 0; |
| 57 | os << n; |
| 58 | assert(os.bad()); |
| 59 | assert(os.fail()); |
| 60 | } |
| 61 | { |
| 62 | testbuf<char> sb; |
| 63 | std::ostream os(&sb); |
| 64 | unsigned short n = 0; |
| 65 | os << n; |
| 66 | assert(sb.str() == "0"); |
| 67 | } |
| 68 | { |
| 69 | testbuf<char> sb; |
| 70 | std::ostream os(&sb); |
| 71 | unsigned short n = 10; |
| 72 | os << n; |
| 73 | assert(sb.str() == "10"); |
| 74 | } |
| 75 | { |
| 76 | testbuf<char> sb; |
| 77 | std::ostream os(&sb); |
| 78 | hex(os); |
| 79 | unsigned short n = 0xFFF6; |
| 80 | os << n; |
| 81 | assert(sb.str() == "fff6"); |
| 82 | } |
| 83 | } |