| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <ostream> |
| |
| // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20 |
| |
| // This test fails on MinGW DLL configurations, due to |
| // __exclude_from_explicit_instantiation__ not behaving as it should in |
| // combination with dllimport (https://llvm.org/PR41018), in combination |
| // with running tests in c++2b mode while building the library in c++20 mode. |
| // (If the library was built in c++2b mode, this test would succeed.) |
| // XFAIL: target={{.+}}-windows-gnu && windows-dll |
| |
| // template <class charT, class traits = char_traits<charT> > |
| // class basic_ostream; |
| |
| // basic_ostream& operator<<(const volatile void* val); |
| |
| #include <ostream> |
| #include <cassert> |
| |
| template <class CharT> |
| class testbuf : public std::basic_streambuf<CharT> { |
| typedef std::basic_streambuf<CharT> base; |
| std::basic_string<CharT> str_; |
| |
| public: |
| testbuf() {} |
| |
| std::basic_string<CharT> str() const { return std::basic_string<CharT>(base::pbase(), base::pptr()); } |
| |
| protected: |
| virtual typename base::int_type overflow(typename base::int_type ch = base::traits_type::eof()) { |
| if (ch != base::traits_type::eof()) { |
| int n = static_cast<int>(str_.size()); |
| str_.push_back(static_cast<CharT>(ch)); |
| str_.resize(str_.capacity()); |
| base::setp(const_cast<CharT*>(str_.data()), const_cast<CharT*>(str_.data() + str_.size())); |
| base::pbump(n + 1); |
| } |
| return ch; |
| } |
| }; |
| |
| int main(int, char**) { |
| testbuf<char> sb1; |
| std::ostream os1(&sb1); |
| int n1; |
| os1 << &n1; |
| assert(os1.good()); |
| std::string s1 = sb1.str(); |
| |
| testbuf<char> sb2; |
| std::ostream os2(&sb2); |
| os2 << static_cast<volatile void*>(&n1); |
| assert(os2.good()); |
| std::string s2 = sb2.str(); |
| |
| testbuf<char> sb3; |
| std::ostream os3(&sb3); |
| volatile int n3; |
| os3 << &n3; |
| assert(os3.good()); |
| std::string s3 = sb3.str(); |
| |
| // %p is implementation defined. Instead of validating the |
| // output, at least ensure that it does not generate an empty |
| // string. Also make sure that given two distinct addresses, the |
| // output of %p is different. |
| assert(!s1.empty()); |
| assert(!s2.empty()); |
| assert(s1 == s2); |
| |
| assert(!s3.empty()); |
| assert(s2 != s3); |
| |
| return 0; |
| } |