4684ddb6aa
- import libcxx - reduce targets to the one when compiled as a tools Change-Id: Iabb8427f80ff8e89463559a28bcb8b4f2bdbc496
82 lines
2.2 KiB
C++
82 lines
2.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <ostream>
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// template <class charT, class traits = char_traits<charT> >
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// class basic_ostream;
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// operator<<(const void* val);
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#include <ostream>
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#include <cassert>
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template <class CharT>
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class testbuf
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: public std::basic_streambuf<CharT>
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{
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typedef std::basic_streambuf<CharT> base;
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std::basic_string<CharT> str_;
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public:
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testbuf()
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{
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}
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std::basic_string<CharT> str() const
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{return std::basic_string<CharT>(base::pbase(), base::pptr());}
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protected:
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virtual typename base::int_type
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overflow(typename base::int_type __c = base::traits_type::eof())
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{
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if (__c != base::traits_type::eof())
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{
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int n = str_.size();
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str_.push_back(__c);
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str_.resize(str_.capacity());
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base::setp(const_cast<CharT*>(str_.data()),
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const_cast<CharT*>(str_.data() + str_.size()));
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base::pbump(n+1);
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}
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return __c;
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}
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};
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int main()
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{
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{
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std::ostream os((std::streambuf*)0);
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const void* n = 0;
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os << n;
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assert(os.bad());
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assert(os.fail());
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}
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{
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testbuf<char> sb;
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std::ostream os(&sb);
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const void* n = 0;
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os << n;
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assert(os.good());
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// %p is implementation defined.
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// On some platforms (Windows), it's a hex number without
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// any leading 0x like prefix.
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// In that format, we assume a null pointer will yield 2 '0' hex digits
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// for each 8 bits of address space.
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assert(sb.str() == "0x0" || sb.str() == "(nil)" ||
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sb.str() == std::string(sizeof(void*)*2,'0'));
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}
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{
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testbuf<char> sb;
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std::ostream os(&sb);
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const void* n = &sb;
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os << n;
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assert(os.good());
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}
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}
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