4684ddb6aa
- import libcxx - reduce targets to the one when compiled as a tools Change-Id: Iabb8427f80ff8e89463559a28bcb8b4f2bdbc496
69 lines
1.9 KiB
C++
69 lines
1.9 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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// <istream>
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// template <class charT, class traits = char_traits<charT> >
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// class basic_istream;
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// basic_istream<charT,traits>& operator<<(basic_streambuf<charT,traits>* sb);
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#include <istream>
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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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testbuf(const std::basic_string<CharT>& str)
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: str_(str)
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{
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base::setg(const_cast<CharT*>(str_.data()),
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const_cast<CharT*>(str_.data()),
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const_cast<CharT*>(str_.data() + str_.size()));
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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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testbuf<char> sb("testing...");
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std::istream is(&sb);
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testbuf<char> sb2;
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is >> &sb2;
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assert(sb2.str() == "testing...");
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assert(is.gcount() == 10);
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}
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}
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