| 1 | //===----------------------------------------------------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | // <ostream> |
| 10 | |
| 11 | // template <class charT, class traits = char_traits<charT> > |
| 12 | // class basic_ostream; |
| 13 | |
| 14 | // operator<<(unsigned long long val); |
| 15 | |
| 16 | #include <ostream> |
| 17 | #include <cassert> |
| 18 | |
| 19 | #include "test_macros.h" |
| 20 | |
| 21 | template <class CharT> |
| 22 | class testbuf |
| 23 | : public std::basic_streambuf<CharT> |
| 24 | { |
| 25 | typedef std::basic_streambuf<CharT> base; |
| 26 | std::basic_string<CharT> str_; |
| 27 | public: |
| 28 | testbuf() |
| 29 | { |
| 30 | } |
| 31 | |
| 32 | std::basic_string<CharT> str() const |
| 33 | {return std::basic_string<CharT>(base::pbase(), base::pptr());} |
| 34 | |
| 35 | protected: |
| 36 | |
| 37 | virtual typename base::int_type |
| 38 | overflow(typename base::int_type ch = base::traits_type::eof()) |
| 39 | { |
| 40 | if (ch != base::traits_type::eof()) |
| 41 | { |
| 42 | int n = static_cast<int>(str_.size()); |
| 43 | str_.push_back(static_cast<CharT>(ch)); |
| 44 | str_.resize(str_.capacity()); |
| 45 | base::setp(const_cast<CharT*>(str_.data()), |
| 46 | const_cast<CharT*>(str_.data() + str_.size())); |
| 47 | base::pbump(n+1); |
| 48 | } |
| 49 | return ch; |
| 50 | } |
| 51 | }; |
| 52 | |
| 53 | int main(int, char**) |
| 54 | { |
| 55 | { |
| 56 | std::ostream os((std::streambuf*)0); |
| 57 | unsigned long long n = 0; |
| 58 | os << n; |
| 59 | assert(os.bad()); |
| 60 | assert(os.fail()); |
| 61 | } |
| 62 | { |
| 63 | testbuf<char> sb; |
| 64 | std::ostream os(&sb); |
| 65 | unsigned long long n = 0; |
| 66 | os << n; |
| 67 | assert(sb.str() == "0"); |
| 68 | } |
| 69 | { |
| 70 | testbuf<char> sb; |
| 71 | std::ostream os(&sb); |
| 72 | unsigned long long n = 10; |
| 73 | os << n; |
| 74 | assert(sb.str() == "10"); |
| 75 | } |
| 76 | { |
| 77 | testbuf<char> sb; |
| 78 | std::ostream os(&sb); |
| 79 | std::hex(base&: os); |
| 80 | unsigned long long n = static_cast<unsigned long long>(-10); |
| 81 | os << n; |
| 82 | assert(sb.str() == "fffffffffffffff6"); |
| 83 | } |
| 84 | |
| 85 | return 0; |
| 86 | } |
| 87 |