b64f8b07c1
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@119395 91177308-0d34-0410-b5e6-96231b3b80d8
89 lines
2.2 KiB
C++
89 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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// template<class charT, class traits>
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// basic_ostream<charT,traits>& operator<<(basic_ostream<charT,traits>& out, charT c);
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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::wostream os((std::wstreambuf*)0);
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wchar_t c = L'a';
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os << c;
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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<wchar_t> sb;
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std::wostream os(&sb);
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wchar_t c = L'a';
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os << c;
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assert(sb.str() == L"a");
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}
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{
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testbuf<wchar_t> sb;
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std::wostream os(&sb);
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os.width(5);
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wchar_t c = L'a';
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os << c;
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assert(sb.str() == L" a");
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assert(os.width() == 0);
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}
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{
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testbuf<wchar_t> sb;
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std::wostream os(&sb);
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os.width(5);
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left(os);
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wchar_t c = L'a';
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os << c;
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assert(sb.str() == L"a ");
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assert(os.width() == 0);
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}
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}
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