| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // <ostream> |
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| 10 | |
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| 11 | // template <class charT, class traits = char_traits<charT> > |
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| 12 | // class basic_ostream; |
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| 13 | |
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| 14 | // basic_ostream<charT,traits>& operator<<(basic_streambuf<charT,traits>* sb); |
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| 15 | |
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| 16 | #include <ostream> |
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| 17 | #include <cassert> |
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| 18 | |
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| 19 | #include "test_macros.h" |
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| 20 | |
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| 21 | template <class CharT> |
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| 22 | class testbuf |
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| 23 | : public std::basic_streambuf<CharT> |
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| 24 | { |
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| 25 | typedef std::basic_streambuf<CharT> base; |
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| 26 | std::basic_string<CharT> str_; |
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| 27 | public: |
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| 28 | testbuf() |
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| 29 | { |
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| 30 | } |
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| 31 | testbuf(const std::basic_string<CharT>& str) |
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| 32 | : str_(str) |
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| 33 | { |
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| 34 | base::setg(const_cast<CharT*>(str_.data()), |
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| 35 | const_cast<CharT*>(str_.data()), |
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| 36 | const_cast<CharT*>(str_.data() + str_.size())); |
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| 37 | } |
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| 38 | |
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| 39 | std::basic_string<CharT> str() const |
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| 40 | {return std::basic_string<CharT>(base::pbase(), base::pptr());} |
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| 41 | |
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| 42 | protected: |
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| 43 | |
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| 44 | virtual typename base::int_type |
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| 45 | overflow(typename base::int_type ch = base::traits_type::eof()) |
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| 46 | { |
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| 47 | if (ch != base::traits_type::eof()) |
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| 48 | { |
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| 49 | int n = static_cast<int>(str_.size()); |
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| 50 | str_.push_back(static_cast<CharT>(ch)); |
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| 51 | str_.resize(str_.capacity()); |
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| 52 | base::setp(const_cast<CharT*>(str_.data()), |
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| 53 | const_cast<CharT*>(str_.data() + str_.size())); |
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| 54 | base::pbump(n+1); |
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| 55 | } |
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| 56 | return ch; |
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| 57 | } |
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| 58 | }; |
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| 59 | |
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| 60 | int main(int, char**) |
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| 61 | { |
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| 62 | { |
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| 63 | testbuf<char> sb; |
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| 64 | std::ostream os(&sb); |
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| 65 | testbuf<char> sb2("testing..." ); |
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| 66 | assert(sb.str() == "" ); |
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| 67 | os << &sb2; |
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| 68 | assert(sb.str() == "testing..." ); |
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| 69 | } |
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| 70 | #if TEST_STD_VER > 14 |
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| 71 | // LWG 2221 - nullptr. This is not backported to older standards modes. |
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| 72 | // See https://reviews.llvm.org/D127033 for more info on the rationale. |
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| 73 | { |
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| 74 | testbuf<char> sb; |
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| 75 | std::ostream os(&sb); |
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| 76 | os << nullptr; |
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| 77 | assert(sb.str().size() != 0); |
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| 78 | LIBCPP_ASSERT(sb.str() == "nullptr" ); |
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| 79 | } |
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| 80 | #endif |
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| 81 | |
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| 82 | return 0; |
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| 83 | } |
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| 84 | |
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